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Kenny,
Sounds like he is throwing his money away..I know BES uses the PAC spring and I think BES builds his motors..I know Butch Kemp ran them and dropped a valve at the last Milan race because he had 40 passes on a set on the exhaust side..they were testing them to see there durability.

I am pretty sure John Langer and Bruce Maichle hurt both there motors at the end of the season also because of the PAC spring..

Hey Chris I now John hurt his pretty bad it's still not back together.I just put the manley nextek 1449's on mine at the beginning of last season When are you going to have your new motor done.Kenny

3120lb, small block, 10.5" tire, NA, through exhaust, full int, WITH 83/4 REAR, 9.0 at 150mph