Originally Posted by ealesh33 (Post 4311866)

Blue stripe wouldn't be correct, the pac spring is a green stripe. We went through this when I got my afr's. My builder looked them up and he thought the stripe on my springs looked blue, which would have been a pioneer spring and he would have made me change. AFR discontinued use of the pioneer spring sometime late last year, when I talked to AFR he told me that there wasn't even a blue/black stripe spring (pioneer) in there facility when the order was placed for my heads, they were gone long before that. I placed that phone call to get it all straight to assure my builder, and had them send me pics of the pioneer spring with the blue/black stripe to confirm. The pac spring has a green stripe on them, if it has a blue/black stripe it is a pioneer spring.

Originally Posted by the deep (Post 4311910)

mike , empty your pm box .

Originally Posted by Full Force (Post 4311951)

[ATTACH=CONFIG]541762[/ATTACH]

Actually it is green.... Thought blue oops looking at pic a couple posts down that's what I got is geeen

Originally Posted by Budman II (Post 4311981)

Well, FWIW, this is what Jegs lists as the specs for the green stripe AFR springs. It lists a spring rate of 645 lb/in - does that sound right? Take it for what it's worth, I would verify your spring rates with a spring tester. It doesn't say if this is the PAC spring, so it might be something different.

http://www.jegs.com/i/AFR-Airflow-Re...ductId=1630809

Originally Posted by Budman II (Post 4311987)

BTW, have you verified that you have the inconel exhaust valves? At this point, I would be verifying everything about those heads.