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383 Plate honed, very lttle core shift. XE276 retro roller Comp Cam Wiseco dish pistons floating Vortec 64 cc heads standard gasket 5.7 rods 130-135 PSI cold comp. in each cyl. (seems low to me.) Leak down is 10% in 6 cyl. on a 100 pound scale. 5 and 6 are leaking 18 and 22%. First oil change...

I have a 383 SB that now has about 2000 miles on it. The motor was run hard on a dyno with 10-40 dino. Then run about 1000 with a new batch of 10-40 dino. (run hard, lots of decceleration in gear, and WOT pulls well into top gear, 9-13 sec.) Oil was dropped sent out to Blackstone and replaced...