I have 1967 427 049 heads 98 cc the 74 454 781 have 118 cc

Nice Mark!

When all in the world is right

What is your take on a gear drive timing set?

Did you state if it was a small or large journal crank?

Nice work fellas 👏

What a beast, it sounds perfect

Similar to my build

Back in 1998 I built a 12.5 ls7 454 short block and installed merlin 269 iron oval ports, everyone laughed at me when I removed the iron rec ports. 12.5 compression Merlin iron oval ports I ported. Ultradyne solid roller. 263 271 660 680 108 lobe sep installed at 103 Dart oval port 1050 Dom. On a stuska dyno it did 726 hp and 640 torque. Hp peak was 6800. Car went from 10.60 at 128 to 10 flat and 136. The good old days, I ran that engine for ten years on street and track.

Typical Chevy breaking down having problems and beat by a little small block red mustang LOL

On race engines I don't use exhaust seals no cut

I'm late to the party But I'm getting sick and tired of people discouraging others from wanting to use older steel heads. It makes me assume that they DID NOT have exposure at a young age to the older stuff. I'm about to pay $1500 on some 990 heads. The main reason is that because as a 16 year old I was blessed enough to ride in a gold class show car that had an LS7 in it(no kids..not an LS) It's about feeling some godd emotion to go along with the highs and lows of tinkering with these old.hot rods. Also, for anyone reading...PLEASE don't toss the steel heads out. Sell them to us ..or better yet...use them yourself. ..you won't regret it Thanks

More the keyboard builders post the more it is obvious they dont know jack. THis is a great street combo good torque curve can drive every day! Makes more torque than the GM 350hp cam too. Dont think anyone here is gonna teach mark anything haha

Great job on Videos always awesome. I would still like a real comparison with same valve diameter to have a real life gain on porting without changing the valve side or even and or, change valve with no porting and flow to see the gain. These are just suggestions I would like to start porting heads I watch videos but I think I would start with someone with experience by my side! Thanks again and keep doing your great job!

You need to be at a level of machinist understanding for this ! Great Job .

Exactly what I’m looking for in my dually!!!

Love it!!!!

I just picked up a clean set of 292’s for $200. They have good guides no rust pitting and passed the magnaflux inspection. They still have stock valves and don’t appear to have had any work done to them. Are these heads good candidates for a performance build?

Pretty amazing power and broad torque with a smallish cam and iron heads. I really didn’t think it would pull that high with only 315 cfm available at peak cam lift Very nice work I build a lot of strokers myself!

Thanks so much Mark! That is big power for a 467 and that small of cam...Wow!

just found you, subscribed

Doing fixes seem to be the standard thing with pro comp stuff consistency in the casting and machining is always nowhere defiantly better to pay for the US made heads if you don't wanna mess around for average results.

Curious why you only changed the cast guide on the intake and not the exhaust too? Usually the exhaust has more wear than the intake does.

Surprised that head with the core shift made it through Quality Control?

Are the exhaust seats hardened when you’re done?

This is a quarter mile, right ?

We're are you located and what's the cost to do a set of 781 heads.Nice work

How good are the 950bbc heads,trying to find Information but not successful,would love to know ,cc,chambers,and flow rates,ty rates

Do you still do iron bbc heads

Did he ever actually say what the compression ratio was on this engine

I picked up a set of 1971 820's about a year ago for 100 bucks. Had them checked, everything renewed for another 150, I have no extreme build, but about 450 Hp with about 425 -450 ft pounds of trq.

What was corrected altitude?

Picture looks like you plugged the oil filter Bypass I personally would never do this because A big block engine bypasses oil anything over 2500 Rpm!!!

Thank you for showing how to properly resize Connecting rods for A performance Build. Love you Videos Jim !!!

What about grooving the lifter bores!!!

Don't you want internally balance a 454? to much Money!!!

In to days money How much should i be willing to pay for A good 454 4Bolt Mark 4 Engine Block 2/22/2024 Thank you for your videos Jim!!!

That "extra space" can be made usable as quench area.

Awesome car what size fan an fan spacer for fan do you run

I know this post is older I bought an 89 camaro with a 327 stroked. 30 over 11to 1 pistons and hydraulic roller cam. Honestly it's plenty of power it rips I have edlebrock proflow efi I'm obsessed with this car I make excuses to drive it 🤣 anyhow plenty of power enough to have fun!

Putting k lines in new cast iron guides seems like extra work to me, i would have just put in thick walled bronze guides in, only thing i can think of is he probably didnt have any or possibly the right size bronze reamer as they are different for cast and bronze.

Thanks for having an awesome channel!

That is the fastest way to deshroud a valve! I have only seen the old school Guys gring them by hand.

Wow so many commenters still didnt listen to what he had to do . Junk save up and buy some real heads or Marks worked irons Bet the owner spent more in the end than if he bought some afrs. And would make more power for sure. Dont lie to yourself...lol

Try googling or CALL him if you are serious. Hes obviously working and not playing on YT all day. Sheesh. Vortecpro

I know this is old video but wouldn't a single plane intake be better for this setup? Why choose the duel plane

love your videos Especially on Big block Chevrolet Core Shift Thank You! Jim

I'm just curious what the 3 block casting #'s are.

Just stumbled across this build series. Really enjoying the Tech and Outcome... Thanks to you and the Team!

How much do you charge to port and rebuild a set of 781 or 049 heads?