A few points on the 10.2 deck TD 427 BB Chevy.

Just talking about a 1969 427 TD bigblock Chevy im building with twin Turbos. How im gonna do it.

[@JohnMiller-ee9pn]

Good info I have been planning almost the same build for my 54. 210 but just carburetors thanks for sharing.

[@thereluctantgearhead4544]

My first car was a 53 Chevy. Wanted to build a gasser with it, but it was rough and I was young and broke. Always liked that body style.

[@bloodhawk6252]

Sweet can't wait to hear it

[@thereluctantgearhead4544]

Should be a monster.

[@bloodhawk6252]

@@thereluctantgearhead4544 how far can the 366 tall deck be bored

[@thereluctantgearhead4544]

@@bloodhawk6252 I've seen them bored out to a 4.125 bore for 402ci. Those cylinders are extremely thick.

[@unclesquirrel6951]

I've found that when I sonic checked any of the bbc Tall that came into my shop that the cylinders are safe to about 0.120-0.130 ish over bore depending on core shift and corrosion in the water jackets . A 4.37 stroke was about as much I'd go with out running into the oil gallery also . I don't like to see the wall thickness under 0.180 on the trust side and 0.160 ish for the rest of the cylinder. Especially under a higher rpm anything over 750 hp range the walls start to flex somewhat after that .

[@pauldhiman8369]

Love it 😎👍🏽

[@eb972]

I have a peanut port allergy.

[@thereluctantgearhead4544]

Good for a tow truck I guess, ain't worth a shit for making big power tho.

[@eb972]

@@thereluctantgearhead4544 agree!

[@jameswatson4110]

He does sound just like Sam Elliot

[@thereluctantgearhead4544]

@@jameswatson4110 My dad looked like his twin. They are about the same age too. He also has a baritone voice. People told me I looked like Sam Elliot also. My nickname in prison about 35yrs ago was "Gar" from movie Roadhouse. It was popular at the time. Pissed me off at first, but then I didn't think much about it. Was called Motorhead when I did time at another penitentiary. Those days are long past tho. Now I'm a perfect citizen.....

[@thereluctantgearhead4544]

@@jameswatson4110 I had a good friend I knew for life named James Watson. He passed away about 10yrs ago. He was a good dude. Worked for the railroad.

[@radkesrods1184]

where do you get that good shit from? i want some for mine

[@thereluctantgearhead4544]

@@radkesrods1184 It's out there, just gotta search for it.

[@jeremystory6981]

We took an old pulling truck motor 530 cubic I think I remember didn't have water in the block it was about 13.1 race car Nova I think it ran like a 5.30s

[@thereluctantgearhead4544]

Alot of these TD bigblocks ended up in pulling trucks and tractors. Bastards are stout.

[@GaryMathews-qk8de]

the tall deck bbc block did suffer from core shift .I had a TD BBC block and had it sonic check ,it would not handle any over bore or stroking .sonic check it before buying parts .my GM race block cost $1500 ,but was good for 4.625 bore safely

[@HawnLs3]

Where you buy this race block for $1500?

[@thereluctantgearhead4544]

You must have had a fluke, because I've seen many of these engines and most will go .125 over no problem. But a aftermarket race block is better of course, but tractor pullers were getting 1500-2000hp with these blocks decades ago. Seen many of them. I used to be connected to that scene. Had a mini rod tractor myself. If they can survive in that environment, they can survive about anything. Have seen a few explode, but they had some serious pressure going on. Many lived for years.

[@sethhughes2163]

You are correct... My first car was a 69' Chevelle SS 427 and at 16 in 76' working at the hot rod shop... I learned what to gather... one of which was 427 TD motors, with .400" taller deck height ( I sold around a dozen to local boat racers in the 70's). I have bought all I have ever found ( blocks and cranks ) I only have 11 left, as they are more scarce than ever( hint... C-50's and up). Last week on the 31st... I was walking the salvage line waiting for them to open... bought 3, ( tip#2) and 2- 400's from another gentleman, who gave me 4 gen3 LS complete all aluminum block engines ( 1-6.2, 2-6.0's, and a 5.3) if I helped him unload his 24' flat bed... I had him sit... and soon I was done. Started that 25yrs. ago, paid my nephews $100 each and lunch for the day... after we got back to the shop... and spent less than if I had stayed home... lol. I worked at a GM Performance Parts dealer while going to school in 79', and have kept that relationship solid for 40+ years... If you need info... I have it all from 76' to today... Have a good one, Seth

[@thereluctantgearhead4544]

My first car was a 2 door 53 Chevy I was building a gasser with, bought it at age 12, age 14 I bought a hotrod 67 Firebird and got on a Pontiac engine obsession for about a decade. Also did the Oldsmobile and Buick engines started on the bigblock Chevys in the 80s, built a few TDs for a couple pulling tractors and a 70 C-10 pulling truck and a minirod. Built one for a 80 C-10 Pro Street, and another for a mid 70s Camaro drag car. Also built one for a Fan Boat in Lousiana. I built engines for a living for over 30yrs. Just retired when they shut the world down. I've had my hands on a few of them since the 80s. Damn good engines to build.

[@thereluctantgearhead4544]

I'll buy up every bigblock Chevy I can find including the tall decks. Even the 366s could be worked with. We had one running mid 7s in the 8th in a Camaro drag car, it was surprising simple. Was supposed to be a temporary engine till the big engine got finished, but it ran alot better than we expected. Pretty much was a stock 366 with closed chamber 215 casting 396 heads on it with a Tarantula intake & 850 Holley DP. L-88 cam and K-motion springs and Comp roller rockers. Hooker Super Comp headers. Ran 7.50s in the 1/8 at around 3200lbs. Car was set up for drag racing, but that old 366 ran damn good.

[@hendo337]

Damn, with a 4.5" piston and 3.76" crank it would be around 478ci. That sucker would be pretty mean as long as the cylinder walls were stiff enough.

[@unclesquirrel6951]

I have several 427T old blown alcohol engines and my street 8-71 street 438 tall block . they are fantastic engine cores , great blocks and cranks ( AND ! The stock 427T rods are basically " DOT " rods just with 3/8 bolts instead of the 7/16th rods . It's a simple process to make them into good street for the normal low deck connecting rods.

[@thereluctantgearhead4544]

Yep, back in the day those TD 427 rods were sought after to use in 9.8 block 427/454s. Very strong connecting rod. Everything about them old TD bigblocks was heavy duty as hell.

[@thefakederekrufle]

I’m slowly working on a 455 olds. I have a lunati roller cam with about .560/.570 advertised lift 110 lobe separation. I got edelbrock heads in the “roller” version. Do I need to do anything?

[@thereluctantgearhead4544]

Make sure you have enough spring pressure for your cam.

[@thereluctantgearhead4544]

You running a hydraulic roller or a solid roller? Makes a hell of a difference on the springs selected.

[@thefakederekrufle]

@@thereluctantgearhead4544 Hydraulic

[@thereluctantgearhead4544]

@@thefakederekrufle you should be in the 150lbs closed and 400lbs open range for a hydraulic roller in a Oldsmobile. Just find a spring in that range and you'll be fine. Probably end up with a 1.800 to 1.900 installed height.

[@thereluctantgearhead4544]

@@thefakederekrufle Converting to a beehive setup would be worthwhile in your engine. Drop alot of grams in the valvetrain.

[@jeremystory6981]

I want to tell you when I was a kid 1996 I bought a fuel truck with a towel top deck 427 I'm pretty sure I was 14 .I was 16 I had big block Springs in my car and all jacked up ready to go but by then I was in the small blocks and single-plane solid Lyft RPMs years and years past I sold that old motor for 1800 bucks and that guy sold it for 2600 bucks somebody in California in 2003 it was a 1969 C10 dark green with no rust I sold it for four hundred bucks

[@thereluctantgearhead4544]

Yep, I've let a few get away too. And the bitch is that I can no longer afford the kind of cars I had when I was young. All that old shit done got valuable.

[@thereluctantgearhead4544]

I had a green 69 C-10 stepside short bed. Built a drag truck with it and ended up trading it for a 69 ElCamino SS 396 car. That bastard got stolen about a year later out of my driveway. I'm still mad 25yrs later.

[@Vuhjayjay68]

I just bought one of these out of a c60 and I was told by everyone I know I waste my money because it won’t make power Now I know for sure they’re wrong Thanks for the info

[@thereluctantgearhead4544]

Damn good engine to build. Alot of them went into Super Modified pulling tractors. Obviously a stout unit.

[@thereluctantgearhead4544]

@@Vuhjayjay68 This 427 TD I'm currently building should make around 750hp NA. They can make plenty of power. It's just another bigblock Chevy, but tougher. Thicker block and harder iron. Ductile iron main caps. Strongest engine Chevy ever built.

[@thereluctantgearhead4544]

@@Vuhjayjay68 Mine gonna turn 8000rpm too.

[@sc358.]

Didn't know Sam Elliott was a hot rodder 😆 Will be a cool engine. Considering buying a 427 tall deck for 650. Gotta 73 k10 with a worn out 350 that needs a bbc. May do a temporary 454-467 2 bolt from a 454 with ported 781s and make 600-630hp, or ported 236s and make 500-550. And work on building a "budget friendly race motor" with conventional 24° heads. Something like 535-571 with a tall deck, profiler tunnel ram, solid roller 850-910hp goal on 91, some water meth for towing/running hard. That's easily 15k if do a lot myself 😢. Would love to build a blown methanol spread bore, in the neighborhood of 800 inches with 9-15 degree heads depending on what's available by then for my 57 big back window. But that's 50k+ doing a lot yourself with really good parts.

[@sc358.]

It's real easy to spend a lot. Guess going twin turbo and keeping rpm lower can make a lot of sense power per dollar wise vs 6000ft/sec piston speed and trying to get valve train to live with 0.850" type lift.

[@thereluctantgearhead4544]

Yep, ole TD is a stout piece. Good to 1500+hp. Tractor pullers loved them back in the day. I'm going to hang a couple 7875 Turbos off this one. Should make 700+hp NA.

[@sc358.]

@@thereluctantgearhead4544 hell yeah. Hey are you familiar with the 502 blocks? I've gotta guy selling a square body with a 502, th400, 14 bolt, 3/4 front, lift... for 3k. I'm not particularly familiar. Know they are over 3k new for just the block. Are they only aftermarket? Sounds like they might be and kinda a mix between mark IV and gen v. GMs web site says 700hp rated (sounds too low). Think the bore can go 4.5 and maybe a 4.5 stroke as well (although they say up to 4.25 but I think it can be clearanced...). So 540-572 potentially? I would like a 14 bolt for my 73 k10, would like a dana 60 front but 3/4 ton 44 may do. Your thoughts/experience?

[@thereluctantgearhead4544]

@@sc358. Yep, 502 damn good engine. Believe the early ones were MK4, then went to GEN V. Best thing to do is bore it to 4.50 and drop a crank in it. Definitely make some power. Need some big heads for it. I built a couple 502 marine engines back in the day. Course they went into drag cars. 4.50 stroke crank fits pretty easy. Just deepen the existing clearance notches on the block. Those GM crate engines are usually rated on the low side. Plus they ain't maxed out since they come with a 2 yr warranty. But a cam & intake change on a GM 720hp 572 can net another 100hp pretty easy.

[@sc358.]

@@thereluctantgearhead4544 awesome, thanks for the info. A machine shop has a 502 out of a boat (not salt water) for 750. So I'll probably pass on the truck. The machine shop 502 is older though (I think) no fuel pump boss. I'm wondering if it could be old enough to have issues with sealing like the gen v. I'll have to do more research, maybe stop by the machine shop and take a look. Can have him sonic check it. I'd like to go 4.600, hear some can go 4.625. It'll depend on thickness. Being a 9.8 deck I'll have to call around and see if callies or someone (not putting the money out for Bryant, Winberg...) makes a crank with shorter counterweights to clear piston skirts and maybe consider 2.1 or 2" rod journals for a 4.5 stroke, will need to check overlap. But they do a 540 real easy from what I hear. Heads... I was thinking of trying the cheaper rout and going with some bare as cast promaxx 317s and porting them, 2.35 valve, 3.3-3.63 min cross section depending on 540-598. Not gonna turn it to the moon, probably shoot for 6900-7200 peak power depending on stroke. Use some good parts. Try and stick within 15k of I go that rout. Like the 427 tall deck cuz I can get more rod in it at a 4.5 stroke; guess the 427 can go 4.75 if I modify the oil passage. 502 has better oiling system. But it sounds like potentially the max is around 571 inches in 427 and 605 on 502s depending on how lucky you are. So 50-55hp difference on higher effort pump gas NA.

[@WilliamMunny-d8s]

Mortske repair is trying to warn me tall deck big block chevys arent worth a damn! What do you think? im considering buying a 1960 chevy apache half ton with Bus engine 366 with only 115,000 miles on it. Supposedly about 230Hp/383Tq in stock bus trim. Guy has way too much exhaust , dual 2.5 inch pipes all way back to bumper. Hopefully that doesnt sacrifice too much tq for minor Hp gains. Ive no plans to hop this engine up, except maybe headers and 4 BBL if it has 2BBL now, i just want a low mileage, unraced engine that will be reliable to get me from place to place and look cool in an old truck doing it.

[@thereluctantgearhead4544]

@@WilliamMunny-d8s Dudes a fuckin idiot. Those tall deck bigblocks are some of the stoutest engines ever built by any company. I'd run with it if I was you let let Mortski do his own thing. I'm building one now that would smoke anything he's ever built. Fuckin clown.

[@thereluctantgearhead4544]

@@WilliamMunny-d8s I don't like thst dude. Fuckin paid shill.

[@thereluctantgearhead4544]

@@WilliamMunny-d8s I once threw together a 366 for a friend to go into a drag car until the "real" bigblock got finished. It was stock other than closed chamber #215 396 heads, a L-88 cam, a tarantula intake & 850 Holley DP, 2 in Hooker headers. It ran 7.50s @95mph in the 8th in a 2nd gen Camaro. Bottom end of the engine was untouched. I'm building one with twin Turbos that'll make around 1400hp. I tell all them dipshits that say they ain't no good to just give them to me then, I know what to do with them. Building a .060 427 Tall Deck with a 274/282@.050 solid roller and 13.2-1 compression, it'll make around 750hp and turn 8000rpm. Using 6.535 long H-beam rods and Icon forged dome pistons made for a 9.8 deck 427. Stock crank in those things is indestructible. Block will take 2000hp. Tractor pullers used them for years in unlimited class blown alcohol 9200lb units. Usually 4 to 6 of them on a single tractor. They are tough. Boat racers used them too. Some people just don't know what they don't know. Throw you a mild cam in it, a good intake, 750 Holley DP and headers, that thing will burn your tires off at will. They are torque monsters too. I've seen different power ratings on them, but I do know it don't take much to make some power with them. They sell intakes for TD bigblocks that use a regular distributor. Pretty much all regular bigblock shit works on them. .400 is the difference in length of pushrods and piston height. That's pretty much the difference. The .400 long rod and 427 9.8 deck pistons is the best way to go. On the 366, they can be bored to a standard 396 piston and use .400 long rods. But for what your wanting to do, that would be unnecessary. The stock bottom end can be revved to 5000rpm pretty safely. Hard to break one.

[@thereluctantgearhead4544]

@@WilliamMunny-d8s That L-88 cam was a pretty rowdy unit actually. In your engine id just stick a Comp HE 268 or 280 advertised duration cam. They been around forever and they work. Something similar from another company would work too. A lot of them are selling the same fuckin cams anyway. Bullet is real good shit. Used to be Ultradyne. Harold Brookshire is one of the best cam designers to ever live. That's his designs and was his company. Used to be Brookshire Cams. Real good shit. Lunati & Isky also sell good cams. Find yourself a tall deck Weiand oval port intake and that'll be the ticket. Drop a regular HEI distributor in it and use a regular thermostat housing. And use a short water pump & brackets for a 396/427 from the late 60s. It'll look like it grew there. Hooker Competition Headers for a 68-72 A-body bigblock Chevelle will fit it better than truck headers.

[@thereluctantgearhead4544]

@@WilliamMunny-d8s People used to bore 427 TD blocks out to .4.375 without thinking twice. I've even heard of people boring them out to 4.500, but that seems A little excessive to me, but I believe it has been done. Those blocks are thicker than normal bigblock Chevys. Look at the vehicles they come in. My 427 came in a C-70 Dump tandem axle dump truck. Hauled a shitload of weight, so they had to be tough just to survive the application.

[@hendo337]

That's going to be a mean as hell twin turbo 427, definitely something different and interesting. Lot of people kinda talk down on the tall decks and act like they're too niche. I always wondered what could be done with one. I suppose the standard height cam tunnel might not allow as much extra stroke as would otherwise be possible, still lots of potential there. You'll have a shit load of power and it'll probably be a hell of lot more durable than trying to make 1500hp with an LS.

[@thereluctantgearhead4544]

I've heard of people getting 4.500 stroke cranks in them, but it took alot of grinding and a .900 base circle cam. Also a half fill on the block to the bottom of the water pump holes. Think they also used rods with 2.000 or 2.100 SBC sized journals

[@thereluctantgearhead4544]

Been more than a few of them on unlimited class pulling tractors with 14-71 blowers on methanol making 2000hp back in the 1980s. They ran 4 or 5 of them together. Hell of a spectacle watching one start up close up.

[@unclesquirrel6951]

If you are looking for 1300 hp 14-15 psi should get you there if you are at 650 hp in normally aspirated trim .

[@richardmathern900]

where do you find the intake that uses the reg distributor.

[@thereluctantgearhead4544]

Pretty much all the DART singleplane intakes made for the 10.2 deck blocks use a standard distributor. Also the TD Super Victors and BRODIX intakes do as well. I'm using a GM Bowtie TD singleplane and it uses a standard distributor too. TD Team G singleplane also takes standard distributor, BMP TD singleplane too. Lots of choices really. 6.535 long connecting rods, 9.8 deck pistons and .400 longer pushrods and your good to go. Everything else is standard bigblock shit. I've swapped a few TDs into vehicles and the headers for a 9.8 deck block bolted right on. One was a 2nd gen Camaro and the Hooker Super Competition headers bolted in with a tin of room to spare. Author was a C-10, used 68-72 Chevelle bigblock headers on it. Another one into a G-body with Hooker swap headers. Bolted right in to all them vehicles. Killer engines to build, strong as hell.

[@unclesquirrel6951]

Personally I blame squirrels...... and 427T

[@thereluctantgearhead4544]

286@14hrs.

[@thereluctantgearhead4544]

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