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Author Topic:   confused about Vortec Heads
posted July 03, 2001 10:51 AM
Compression gauge readings don't tell you compression ratio. You need to cc the heads, gasket, and piston to figure it exact. I'm sure there is a GM book that can get you close by the part # of the heads and the pistons you are using.

posted July 14, 2001 10:58 PM
I could also be wrong but I picked up my engine Friday and it has vortec heads with 8
bolts. The vortec heads seem to be working very well. The engine is a 355 and made 430 Hp with a 4412 gasoline carburetor. I experinced the problem you described with lining up the bolts and a thicker intake manifold gasket did the trick.

Artie Perilloux

posted July 16, 2001 07:18 PM
im sorry but, you dont have vortec heads....... vortec heads only have 8 bolts, that run straight up and down.. and a special intake must be used with these heads....ive seen the heads your talking about.. were you just waller the holes in the center out.. these i believe are just late model chevy heads...compression readings are good to help see whats going on in the engine..but i think bbracer17 is right.. you must cc everything to figure exact.

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