I have a 1999 Speed-Pro catalog.
It has a Power Forged piston listed under Pontiac with these numbers:
L2394NF 4.151 bore
L2394NF 30 4.181 bore
Both listed with the following:
1/16 1/16 3/16 Rings
19.3 Dome Volume
.476 Dome
1.500 Comp Dist.
0.0050 Bore Clearance
.
__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/
Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
Best time 5.13 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE
Last edited by Steve C.; 02-18-2026 at 10:29 AM.
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