[F/S GTO]

Yes, you're allowed to float the pins even if the pistons didn't come that way. Mine are not in this motor. Speed Pro rings. The block is a '69 station wagon block that came in the GTO when I bought it 1984.

[ponyakr]

Thanks again for the info. ! That should be good news for any low budget guys who might wanna build a Stocker. I assume that the SP/TRW pistons will save about $500, on a 400 or 455 build.

Hey, there are lots of Pontiac guys who talk down to anybody who suggests using those pistons. TRW is the only brand of forged pistons I ever bought/raced. Made lots of passes in our 455 bracket cars. Never had one single problem with a TRW piston.

I understand about the advantages of lighter pistons, in engines where there are no rules against 'em.

That brings up another question. The Eagle H-beam rods are legal. They weigh only 760gr. So, would the TRW piston/Eagle H-beam combo be to light to pass NHRA tech ?

I see that there is a minimum piston/pin/rings/rod assembly weight. So I assume that a TRW piston/pin with a 760gr rod + SP rings will be over that minimum.

http://www.classracerinfo.com/Engine...5&MAKE=Pontiac

Piston-Rod Specs----Piston Weight-----Comp Height----Pin Weight------Rings----------Rings Weight----Rod C/C--Max Rod C/C---Rod Weight----Min Assy Weight
--------------------------------551g---------------- 1.695"------------- 90g-------5/64, 5/64, 3/16---------57g------------6.625"-------6.650"------------760g---------------1458g

Also see that the Comp Height is listed at 1.695. I think the SP L2262F pistons have a 1.714 height. Since those pistons are on the accepted list, I assume that the pin height can vary.

https://www.ebay.com/itm/Speed-Pro-T...BWvhuB&vxp=mtr