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Author Topic:   confused about Vortec Heads
lenztalon
Dirt Newbie

Total posts: 4
posted July 03, 2001 10:51 AM
I am confused about vortec heads and the problem with the standard intake manifold.I have two pairs of vortec heads (14102187 & 14014416) at least i was told they were vortec heads, the only problem i experience with bolting the old style manifold is that the four bolt holes in the center of the manifold did no line up so i slotted the holes and the manifold bolted down perfectly.I have installed these heads on a 350 block(14016379)with flat pistons, can anyone tell me what compression ratio i have my readings are 210psi per cyl

juni
Dirt Full Roller

Total posts: 29
posted July 14, 2001 07:48 PM
Check your GM performance catalog on your numbers to my knowledge the vortech heads only have 8 bolts that hold them. On the earlier heads they had 12 bolts some of those heads had the 4 center holes at a different angle than the older ones. I might be wrong so double check on this.

bbracer17
Dirt Maniac

Total posts: 168
posted July 14, 2001 09:33 PM
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.

Strokin3
Dirt Full Roller

Total posts: 68
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.

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Artie Perilloux

MOD RACER#93
Dirt Freak

Total posts: 251
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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