72 350 Rocket #5 Heads?
#1
72 350 Rocket #5 Heads?
I have a 350 Rocket in my 72 Cutlass Supreme getting rebuilt. 1 of my #7a heads is cracked and I'm having it replaced. The shop has a set of #5 heads already in hand off a 73 Olds engine. Will the #5 heads work ok on my 72 350 Rocket? Just want to make sure before I tell him put them on...
#2
Yes. #2 through 7 heads are interchangeable. A 73 motor would have #8 heads from the factory however, and those have bigger combustion chambers and would not work as well. As long as it IS a #5, it will be just fine so long as your machine shop compensates for the different springs and retainers.
#5
just a thought, As the maniac said they are not hardened seats, so if you have hardened seats done by the machine shop perhaps they can also upgrade to the larger 2.00 inch??? w-31 size intake valves??? also you will up the compression a decent amount??? as the 8's were smog heads
#6
#7
just a thought, As the maniac said they are not hardened seats, so if you have hardened seats done by the machine shop perhaps they can also upgrade to the larger 2.00 inch??? w-31 size intake valves??? also you will up the compression a decent amount??? as the 8's were smog heads
#9
Sorry for the confusion, ( I seem to do that a lot )
and thanks also for the education!! I did not know only exhaust valves get hardened seats?
I guess I got mixed up when I read J's Post
and thanks also for the education!! I did not know only exhaust valves get hardened seats?
I guess I got mixed up when I read J's Post
Originally Posted by J-(Chicago)
A #8 head on 1 side of the engine would result in lowered compression in 1 cylinder bank..
#10
I just stopped by the shop and they are actually #8 heads not #5 like he said...I'm thinking he said the wrong thing by mistake...I'm debating whether to let him replace both #7a heads with the #8 heads or just wait and find another #7. He swears the #8 will work fine...
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