Gen V 454 upgrades

Supercharged111 · Sep 13, 2019

That info is wrong and also contradicts with the info below:

12562932: ’91 through ’95 oval port, open chamber, 2.06- and 1.72-inch valves. Used on Gen V truck crate engine.

12562933: ’91 through ’95 oval port, open chamber, 2.06- and 1.72-inch valves. Used on Gen V engines.

Gen V was a peanut port and Gen VI was a small oval port, Gen VI was a superior head but still not awesome by any stroke of the means. Good enough to squeak out 400+ according to the interwebz, but the magazine article people tend to pull unrealistic numbers out of any garbage they strap to a dyno so who knows.

Supercharged111 · Sep 13, 2019

That info is wrong and also contradicts with the info below:

12562932: ’91 through ’95 oval port, open chamber, 2.06- and 1.72-inch valves. Used on Gen V truck crate engine.

12562933: ’91 through ’95 oval port, open chamber, 2.06- and 1.72-inch valves. Used on Gen V engines.

Gen V was a peanut port and Gen VI was a small oval port, Gen VI was a superior head but still not awesome by any stroke of the means. Good enough to squeak out 400+ according to the interwebz, but the magazine article people tend to pull unrealistic numbers out of any garbage they strap to a dyno so who knows.

Supercharged111 · Sep 13, 2019

That info is wrong and also contradicts with the info below:

12562932: ’91 through ’95 oval port, open chamber, 2.06- and 1.72-inch valves. Used on Gen V truck crate engine.

12562933: ’91 through ’95 oval port, open chamber, 2.06- and 1.72-inch valves. Used on Gen V engines.

Gen V was a peanut port and Gen VI was a small oval port, Gen VI was a superior head but still not awesome by any stroke of the means. Good enough to squeak out 400+ according to the interwebz, but the magazine article people tend to pull unrealistic numbers out of any garbage they strap to a dyno so who knows.

Supercharged111 · Sep 13, 2019

Yay another multipost!

Needs15 · Sep 14, 2019

First off I don't know why you seem the need to try and prove me wrong on every post I seem to post, second every where I read about the 10114156 casting number heads that I have say they can be on GenV and GenVI motors. Now it wouldn't be the first time the internet would be wrong on something, don't get me wrong, but from what I see they could fit both motors. Also obviously my motor isn't stock if it has domed pistons bored 30 over and has had the heads port and polished and gasket matched. The link below shows the heads I have on this motor.

https://www.gmperformancemotor.com/parts/12562917.html

Supercharged111 · Sep 14, 2019

Yes, GenV and Gen VI heads are interchangeable. That's not the point. TBI motors got different heads than the Vortec motors, plain and simple (except maybe overseas, they get some odd combos, crate motors as well). There's nothing stopping some broke ass from putting crappy TBI heads on a Vortec motor before you get your hands on it. This isn't about proving you wrong, it's about accurately capturing the information. You may have been saying the same thing, but when I read it I see something else.

Needs15 · Sep 14, 2019

All I was trying to get at was these are the heads that are on the motor and are a replacement head for gen v and gen vi motors not once did i say they came on gen vi motors, the place where I got the info said they came on gen vi motors. I don't have a vortec motor I have a gen v motor so it's not that there out of place on this motor

vr1967 · Sep 14, 2019

The “peanut” Port heads are designed to keep flow velocity up, up to 4500 rpm. These were built as low rpm tow motors. They DO flow enough stock to support 475-500 (flywheel) horsepower
I’ll dig in my notes and post flow numbers for a set of 236 peanut ports (Mark IV) that we did back in the 90s,

My 88 Crew cab (square body) has a carb intake from the factory with a TBI adapter/spacer. You could do the same on a high rise intake

If you run the TBI, run a Vortec (96-00) ep381 fuel pump. The stock early tbi pumps do NOT put out enough flow to supply the big block. The 94-95 big block trucks run at a higher pressure than the earlier tbi trucks and the pumps flowed more also (ep377)

The 454 throttle body has a bigger bore size compared to the 4.3/5.0/5.7 tbi. Also the injectors themselves are engine size specific.

Good luck with the project

Needs15 · Sep 14, 2019

vr1967 said:
The “peanut” Port heads are designed to keep flow velocity up, up to 4500 rpm. These were built as low rpm tow motors. They DO flow enough stock to support 475-500 (flywheel) horsepower
I’ll dig in my notes and post flow numbers for a set of 236 peanut ports (Mark IV) that we did back in the 90s,

My 88 Crew cab (square body) has a carb intake from the factory with a TBI adapter/spacer. You could do the same on a high rise intake

If you run the TBI, run a Vortec (96-00) ep381 fuel pump. The stock early tbi pumps do NOT put out enough flow to supply the big block. The 94-95 big block trucks run at a higher pressure than the earlier tbi trucks and the pumps flowed more also (ep377)

The 454 throttle body has a bigger bore size compared to the 4.3/5.0/5.7 tbi. Also the injectors themselves are engine size specific.

Good luck with the project

Thanks for the info

Minn95Dually · Feb 8, 2023

Needs15 said:
Thanks for the info

Sorry for digging up an old post, but how did this build go? Same motor as me.

Gen V 454 upgrades

Supercharged111

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Supercharged111

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Supercharged111

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Supercharged111

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Needs15

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Supercharged111

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vr1967

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Needs15

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Minn95Dually

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