Who says an inch doesn't count ??

Pontiac never had a "Big Block" it was the same 326/389 it always was😮

N/A vs supercharged

The 455 ruled in the oldsmobile back in the 60's

SD455💪

I rather have the Pontiac.

Try and keep gas in one with today’s prices, going to be a little expensive.

So I would like to know what Z28 EVER came available with the 454 big block??? Cause I think you’re full of crap on that one !! The SS Camaro had an available 396 , but never a 454 and the Z28 that I remember had 302 , 350 and possibly 327 ? But pretty sure they Never offered a 454 in a Z28

Thank you for your knowledge and videos 455 ❤

Hell no!

Thank you for the video!

I'm not sure that you need forged crank and pistons for that if it's not at high rpm for long. I was able to get 370hp at crank with milled and home done cleaned up vortecs circle track cam with just under 0.5 lift performer rpm intake and stock bottom.r I eventually damaged a piston using nitrous but it would have been making well over 450hp at that point. Notched he bore around the valves and added ring gap. Went ok for a 305, revved close to 7000 rpm. If it's sustained high rpm, boost or high comp than forged stuff be good idea but for street or the odd drag race with careful tuning might be ok with stock stuff

ived ran both stock and base modified headers intake carb changes my best 400 had its peak at 6200 rpm and held a 5-8 min pull ... my now current 468 big Chevy same compression but bigger exhaust......... top end Pontiac cant outswirl a Chevy head design is very tough.... it can pull volume metrics faster into the bore

1:30.. it is worth it..because later ..(it never ends) you can add a turbocharger ..make sure to gap the rings for boost when you do the pistons/rods .. 2:25.. was..turbochargers make anything worth it..🏁

The wider valve covers on the 454 are more attractive. In theory, at least, the splayed valves of the 454 should breathe better. And, some later versions offered four-bolt main caps - ideal for forced induction. I don't think that Olds, Pontiac, nor Buick offered four-bolt blocks - but I could be wrong here. I have a Gen V 454 BBC in my 454SS , and it has four bolt mains. (it is a GMPP crate motor, as the OEM Mark IV jumped timing and bent the valves). Interesting video. It seems that more aftermarket speed parts are available for the Chevy, than the others.

Having a KAUFFMAN-BUILT 467" dropped into my 1970 GTO Convertible in Spring 2025. Have it all kitted out, with .600" Hyd Roller, Ported KAUFFMAN D Ports (310cfm), JE Pistons, Eagle forged steel crank and rods...and, in a nod to Nostalgia running a 3x2 TRI POWER with 3 HOLLEY 500cfm 2bbls. Also doing an SD PERFORMANCE lifter valley kit to strengthen the area, 1.65 rockers, ARP head & main studs/4 bolt mains (studs). KAUFFMAN runs a video of a similar motor (albeit they're running LESS cam and LESS cfm head flo: 290 vs my 310), and that motor makes 571hp and 580+ ft lbs of torque. The dyno curve is still going UP at 6,000rpm where that 571hp is taken from. And yes...shes a 4 speed car. Having a custom-built MUNCIE from a guru in Wisconsin. Likely running 4.10s in a beefed 12 Bolt - tire height will "knock it down" to aprox 3.90. Its gonna be and INSANE street motor. Cannot wait !!!

You start off stating the gains are not the same with a 461 stroker 400. Maybe you should familiarize yourself with the internal geometry of the Pontiac motors first.

Do u not tac weld it

Lol Generic Motor Crap bellybutton boat anchors? Try a real big block

Need rear end gears. 3.73

I never had a 400sbc but remember the people who did had issues with overheating. Several friends took the cranks out and put them in 350s. They claimed the 383 made more power than the 400. I stuck with Pontiacs but I know my Pontiacs cost a lot more to rebuild. Back in the day I could have built 2 chevy engines for what 1 Pontiac cost me......or at least according to friends who built chevys

Had a 400 small block kept breaking starter mount. Bad to the bone..

Since the EPA outlawed methylene chloride, there isn't a single decent paint stripper in the USA, in comparison.. It's garbage and companies should be prosecuted for false advertising as paint stripper. In less than 15 minutes, methylene chloride strippers would have paint just falling off of steel.

My engine builder built a SBC 383 9.8-1 compression, stock Vortex aluminum heads, mild roller cam. QJ carb with headers. made 425 HP and 514 TQ. The power is all in the heads. Put RPM performer hands on the 407 Pontiac and you will see similar numbers.

Observing your process. I have just embarked on rebuilding my spare 455 I have been lugging around for 25 years. It will be a quick and dirty build just to keep the car on the road while I build my numbers matching 455 with all the goodies I want over the next couple of years.

Just bought a 67 tribute car w modified suspension, 4 wheel DB, AC, 5 speed manual, and a fuel injected 455 from a Catalina. A literal rotisserie restoration starting with a 6 cylinder Lemans. In many ways it’s better than a real GTO. Most real GTO’s were driven hard and beat up and souped up over the decades. The 6-cylinder Lemans cars were likely babied and just kept clean and stock. Perfect canvas to build a car that outperforms a stock vintage GTO

I bought a 30 dollar harbor freight timing light and it works wonders, my truck was 20 degrees retarted after I put it back together, now it's 3 degrees advance and runs so good, no knock nothing and pulls like a mule

I have owned them both back in the days.Both were stock when I had ran them.Basic upgrades were headers,intake,ignition and carb.I can tell you one thing for sure is the 455 had some serious torque.Felt more torque with the stock 455 then the stock 454.That being said the 455 would stop pulling around 5300rpms where as the 454 would pull to about 6000.I did my best at the time with the timing curves.

I just bought a 67 GTO 400 4 speed. What do I need to be looking for to figure out what this 400 is?

Uhhmm....The 455 isn't a big block...Pontiac didn't make a big block....it's more of a in between block. All Pontiac blocks were basically same size.

Torque is not measured in foot pounds. Get educated dude.

Need help here, 67 Firebird, 71, 400, have butler eng mounts and cam shell frame mounts they sold due to car running a rack, can’t figure out proper mounting

Chevy, a Much better engine design.

Nice video but sorry to tell you that those are 16cc dish pistons and with 6x-8 heads you will have like 6.5-6.8 to one compression ratio. It's going to run nice and live long but a complete dog

Apples vs oranges.

My dad had the same car lol

This is just silly.. by your thinking , you really shouldnt "waste your time" unless its a big block ? I mean... why do a silly thing like a 350 when for similar money ypu can just build a 427? Or 454? .. I ,for one, would be quite happy with a 360 h.p. motor. Not to mention , as a daily driver its likely to get a bit better has mileage with a little les cubic inches. So your seeming to put it down as a waste of time and money is WAY of the attitude and objective of the hardcore, passionate true "hot rodder" .....

I got a 66 lemans sedan the 4 door hardtop is what they call and right now I’m running a blueprint 383 but I’m in between changing to either a sbc 454 or a bbc either 496/502 what should I consider?

Where you located.

As others have commented... alignment dowels are tokeep the front seal centered. Just leave them in. Repeat front seal leaks are a bigger hassle than those dowels

I hope it's Pontiac powered!

From Chief Engineer of the 301 Turbo - originally designed to run on premium unleaded with synthetic oil but GM Mandated vehicles to run on regular unleaded - they would have been more durable with that - ad intercooler - FI - better head design Bigger Turbo etc. in the future it would have been World Class by the mid 80's and on 🏁🏆😎

I'd like to know if this car was ever owned in the Cincinnati area. Looks like one from my youth.

Clean that daum engine bay. Love the patina but little elbow grease would do wonders

No! I would not swap my Big block chevy out for a LS engine. It's no need for it. LS has its place, but not in a 4,000+ pound '68 Impala. I needed a torque monster 👻

Maybe show people how to pick a cam and heads for their application. I think a lot of people get pretty confused doing that and use more of bro-logic than science. I hear people talking about duration and LSA, but rarely do people talk about valve events while considering head flow, rpm and displacement

Love your content, not a ton of Pontiac guys making any, keep it going! 🍻

really, 500 hp?

Excited to see new content from you. I would love to see Desktop Dyno tutorials. I have been trying to use it for my Pontiac engine builds but I am not sure what info to put in for heads.

Rustic Gem