Did a leak down test on warm engine this weekend and all 8 where in the 6-10% leak down range so i guess that is not the problem.

Any toughts on running a vacuum pump on a street motor?


1970 Plymouth Cuda, 512cid on 230 400 block, 5 speed manual.(TKO 600)
1970 Dodge Charger 500, 446cid, 5speed manual.(TKO 600)
1969 Plymouth Roadrunner, 383cid, 5speed manual (Tremec TKX)