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Search took 0.00 seconds. Search: Posts Made By: 25stevem
Forum: Pontiac - Street 11-02-2022, 07:41 PM
Replies: 62
Views: 7,145
Posted By 25stevem
The pistons have to have at least 2 valve notches...

The pistons have to have at least 2 valve notches if there aftermarket.

Please when you have time and before making any changes do a cranking compression test and report back .
Forum: Pontiac - Street 11-02-2022, 05:18 PM
Replies: 62
Views: 7,145
Posted By 25stevem
With some quick math I just did and assuming ...

With some quick math I just did and assuming
1) your deck height is zero.
2) your head gasket volume is 9.4 CCs.
3) your piston notch volume ( 4 notches) is 6.7Ccs
4) your chamber volume is 70...
Forum: Pontiac - Street 11-02-2022, 03:38 PM
Replies: 62
Views: 7,145
Posted By 25stevem
You have a lot more fuel and air entering the...

You have a lot more fuel and air entering the cylinders with that cam, but the exh side of all the street production 326/389 and 421 heads just plain sucks!

The motor can not pump the burnt...
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