[Mike Davis]

Originally Posted by ponyakr

And, since SS & GT cars are allowed some porting, roller cams, light pistons, alum intakes, tranny brakes, & big tires, running a sec under their Stock index should be easily possible. At least that's how it appears to me.



(3) How much ET is a Victor intake worth, on such an engine ?

(4) What about the lighter pistons & legal porting ?



If you choose a '68 428 engine for GT, which is quite popular, the Edelbrock 60587 alum heads are legal. Anybody know aprox how much ET they are worth, over SS legal iron D-port heads ?

http://www.edelbrock.com/media/news/.../070908-2.html

https://www.summitracing.com/parts/edl-60587

http://www.classracerinfo.com/Engine...9&MAKE=Pontiac

On a legal 400CID 69 GTO SS car I helped a guy with years back, we tried 3 intakes in 1 day. Factory 69 Q-Jet Intake, Performer RPM and a Victor, all used the same 800CFM Q-jet.
Looking back at an old log book of his runs
Factory Iron Intake- 11.25@121.17
Performer RPM-11.14@122.8
Victor-11.12@122.6

No tuning, spacers etc between swaps.
I believe he eventually cut the divider in the RPM and picked up a bunch.

ON the 60587 heads are the only legal in GT classes?