Thread: factory heads in 68

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Checked out further these heads came on the 307 327 low compression chevy engines so there is a good chance they are the matching heads. The double humps did come out on 327 chevs, the 186's came out beginning in the 69 model year which was from june 1968. So your car being a 1968 model, the production run ran Approx June 1967 to May/June 1968 so the heads you will be looking for are none accessory hole Double humps. A good way to check this, is by looking at the water pump,

short pump = non accesory hole heads

long pump = accesory hole heads

So for a short water pump engine these are the head castings to go after.
so you would be looking for 3890462 heads produced 66 and 67 and early production 68 Camaros or 391292 heads available in 1968 as an installed head or a replacement service part.

These will raise your compression ratio to @ 10 / 1

These heads to not have hardened seats for todays unleaded fuel.

Just remember you will have to get them as close as possible to your block date code, not ported and not cracked...
Good luck