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09-18-2003, 06:01 PM
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64cc chamber vortec heads
I was thinking of getting my vortec heads cut to 58cc to increase my compression.Would this be a good are bad thing to do and how much more compression can one gain by doing this?
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09-18-2003, 06:39 PM
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maybe 1/2 a point at the most
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09-18-2003, 06:40 PM
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You'll gain about 3/4 of a point, which may or may not be a good thing, depending on your engine specs (displacement, piston style, camshaft, etc...). What are your specs?
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09-18-2003, 06:57 PM
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engine
engine
283 bored .60 over kb-166 signature pistions .100 dome speed pro street/strip rings stock short stroke 3'' crank proline H beam rods rated at 800 hp arp studs on everything summit hv oil pump summit gear drives comp cams 305H magnum cam duration 253@.050 525 lift comp cams .100 longer push rods crane cams 1.5 long slot roller rockers holly street/strip mech fuel pump edelbrock super victor intake accel breakerless billet distributor,super coil,wires,shorty plugs hooker super competition headers 64cc gm vortec heads that have been modified for the large lift Mighty demon 650 carb My compression is 10.1 now and i was wanting to go with about 10.9-11.1.I'm trying to think of the best way to raise it.
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09-18-2003, 09:04 PM
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use a thinner gasket, cut the heads as little as possible, later model heads have thinner decks, the more you cut them the thinner the deck gets, the harder it is to keep gaskets in place. if theres room after the thinner gaskets are figured in, decking the block brings comp. up faster than cutting heads requiring less metal removal, however piston to head & valve clearances become critical and must be checked, and you'l probably want to loose the hyd cam in favor of a solid, the lifters are probably gona float long before the engine starts to get going.
Last edited by Mikey123; 09-18-2003 at 09:26 PM.
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09-18-2003, 09:23 PM
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Thinner gasket
So the thinner gasket method will raise the compression to where i want it?If so how thin can one go?
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09-18-2003, 09:29 PM
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.015 thousands is the thinnist i know of.
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09-18-2003, 09:35 PM
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your dome may hit the head, there is a boss cast into these heads just below the spark plug hole and if you mill the heads this boss will hit the top of the dome!
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09-19-2003, 02:13 AM
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IMO....cut the deck as little as possible.....
It's a Chivy for pete's sake...seek HP elsewhere....
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