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Head Question


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Bolt patterns should be the same. Those heads won't work with Gen V or VI blocks though due to water passage differences. You should be fine with a 78 block though.

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Somethings not right here....

 

This E-bay seller claims these heads to be:

Quote:
1970 454 GM PERFORMANCE RECT. PORT HI-PERF PAIR-NEW

 

He then lists the casting number on the heads as

Quote:
# ON HEADS 14096188-GM HI-PERF.

 

However one website I came across looking for that head casting number says these heads are:

 

Casting number 14096188

Year 1987-94

Engine 454

Intake 2.19

Exhaust 1.88

Chamber Open

CC 118

 

 

 

Any-one have other information that could shed some light on this Casting number??

 

 

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Much happier as in 049 / 781 casting vs these on E-bay or a set of early 70's rectangle ports?

 

I've always thought the rectangle ports are better suited to make HP...didn't the LS5's run Rec. Port heads? Am I mistaken?

 

Regardless these heads are out this guy is either trying to scam or just doesn't know what he's talking about.

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I am personally starting to NOT believe any of the stuff we've heard about Oval vs. Rectangular port heads for street or strip.

 

I have 325cc rectangular port heads on an 8.75:1 motor (454HO) and that is supposed to be HORRIBLE on the street. It actually has very good street manners. Rectangular port heads are supposed to be more for high rpm hp since they can flow so much more due to larger ports. BUT and I think Sam will vouge for this one, there have been several engine builds using smaller port oval heads that make awesome power throughout the rpm range as well.

 

I think either head will work for either purpose. Just don't go with a tiny port smog head and you'll be good with whichever style head you go with.

 

Also, I think, but don't know for sure, that ALL BBC heads have Hi-perf cast into them? Anybody back that up or prove it wrong?

 

Just my opinion.

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LS5's came with the large oval port heads, the only 454's that used rectangle port heads are the LS6 & LS7

 

Scott...pop a set of 049 or 781 oval ports w/ 2.19 intake valves on there, your low end torque will amaze you, I'm not saying the rec are bad, but for a street car the oval's can't be beat

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I have a set of 781 castings, but they need to be completely built....free if you want to come get them

 

there are many aftermarket head companies they are producing ovals now, by the time you spend the money on building a set, you could probably buy a new set, I'd take a look and do some research

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When I win the lottery, I plan on getting some AFR 315cc heads. Thanks for the offer though. Until then, I'll just keep my current ones (I guess I'll have mine for a long time!)

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Bones,

I'd be willing to pay shipping and kick you a few bucks your way if you'd send them up to TN for me.

 

Alls I know is these heads on the 1978 bite and I want to stay cast iron for the time being because I just got those front springs done, if I go to aluminum, I most likely will have to switch out my springs again.

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I'm not sure to be honest. I was planning on having a better set built and just pulling the set on there and putting them aside. I'd like to have an original numbers matching set to go back on the 454 if I ever decide to sell it.

Not that a 1978 454 is in big demand, but if I ever decided to go OEM restoration on a Chevy Truck I would already have a set of correct heads.

 

 

 

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Thanks Sam,

 

Believe it or not I have the 336781's. What do you know, something actually worked out for me!

 

Mike

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those are decent heads, have 2.19 valves put in them, spring pockets enlarged and you're good to go, they work well with stock size valves too for a street engine

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Eventually, I just might do that. I am still working on the interrior and transmission. When I bought the car the heads were recently worked and I really don't know what all has been done. The guy I bought it from only had the car for like 4 months and didn't do any of the work or know anything about it. I removed the valve covers and there were all new springs and seals plus the heads were the only part of the engine not painted.

 

Thanks Again,

 

Mike

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