New or Used heads? - Team Camaro Tech
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post #1 of 6 (permalink) Old Sep 14th, 12, 10:07 AM Thread Starter
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New or Used heads?

I have a 350 with GM heads on it. I was wondering when i rebuild it if i should have the heads rebuilt and port and polished or just buy aftermarket ones? I'm building a 383 stroker. It will be a cruiser with the occasional race.
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post #2 of 6 (permalink) Old Sep 14th, 12, 10:11 AM
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Michael Gekko
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Re: New or Used heads?

Which casting numbers do you have now?

Be careful if you buy aftermarket heads that are 'complete'....there is a price war of sorts going on and some of the componets are more than a little suspect according to a friend that owns a machine shop.

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post #3 of 6 (permalink) Old Sep 14th, 12, 10:13 AM
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Re: New or Used heads?

A 383 likes a little more port volume than a 350. You need to be in the 185cc ran at least for a good street car.


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post #4 of 6 (permalink) Old Sep 14th, 12, 11:55 AM
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Re: New or Used heads?

A 383 will respond well to a good quality head.

I would not hesitate to buy a set of used heads and you can get a great deal on them usually, but you need to be careful as with any used part.
Figure any head you buy you are buying bare whether assembled or not and take their price into consideration.

You can get a decent set of new heads also, but again I would buy them bare and a have a good shop assemble. I'm not a fan of the universal head the mfg. sell, have them assembled for you combo.

Just remember cylinder heads are the key to you combo and money spent here usually will net you the biggest gains IMO, choose wisely and they will make you really happy.


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post #5 of 6 (permalink) Old Sep 14th, 12, 05:52 PM
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Re: New or Used heads?

The best moderate (30+ hp) power increase can be found with vortec heads like summit sells. the aluminum aftermarket heads improve the vortec design but are more money. Rebuilding old heads are about the same money as the summit heads.
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post #6 of 6 (permalink) Old Sep 14th, 12, 06:07 PM
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Re: New or Used heads?

By the time you freshen those heads and then get them ported and polished you could buy a modern head that will flow like gangbusters. They also would be aluminum. Biggest advantage of all is the modern heart shaped combustion on new heads. Ask the GM engineers who designed the Vortec head about that chamber. It is the real secret to the power those heads make and the reason why all the aftermarket head makers have copied it. Don't waste your time on the old heads unless you're doing a restoration.
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