Agree with Frdnut...late timing causes it to fire when the piston is on the way down theoretically exposing more of the cylinder walls to combustion and therefore more transfer of heat into the water jacket. Advance it and try.....John
69 Fastback 302
Acapulco Blue 302, Trick Flows, S2MS Cobra Intake,
262 comp cam, Crane Hi-6 Box and Digital Dist,Roller rockers, Bigs 650DP , Flowtech Ceramic Longtubes, C4 w/2500 stall, JPT valve body, 3.55 Detroit Locker, Magnums.
69 Mach1, Rcode,Acapulco blue 428cj, 4speed,
3.50 N Case Trac Loc, Unrestored