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..