Ol' Fart's Firebird Fantasy

[Mark Yacavone]

Originally Posted by oldskool

As I mentioned at the beginning of this thread, it's main purpose is to gather good Stocker info, not only for myself, but also to help others like me, who have less experience with Stocker stuff.

The only way I know to get this info is to ask those who have Stocker experience, and to find good online info. So I'll just keep firing the questions as I think of 'em.

Subject: Pistons

Question: (1) I see that for some engines there are several NHRA approved forged pistons. So, even if the stock pistons had press pins, are these approved pistons allowed to have floating pins ?

(2) Are all these pistons required to have the same number, size and depth valve reliefs ?

(3) I see that NHRA sets the min weight for the piston. But the min weight for most Pontiac pins is listed as 90 g. That seems like an awfully light pin, doesn't it ?

(4) Also, several of the rods approved for Pontiacs have .990 BBC pin holes. So does that mean that you can order these approved pistons with either size pins ?

http://www.classracerinfo.com/Engine...px?ENGINE=2048

1 Yes, you can float the pins

2 Yes NHRA approved number

3 Don't argue about it, and don't use a lighter pin than you have to.

4. You can use a .980 pin or LARGER if rod is approved.