.433 lobe with Hughes 1.6 rockers, Victor heads, PAC 1243 spring(same as comp 943), 1.900 installed height, peak power at 6800-7k.
Chip is running the same spring at 1.950 in his 572 hemi with .420 lobes, and when he’s spraying it, it turns about 7500 through the traps. 
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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