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I was thinking that maybe I switched to early in 20/20. As has often been the case, I followed the recommendation of the builder that 500 miles was enough for the dino oil. My concern now is that the walls might be glazed a little and that those cylinders might not get any better. Ah yes, the...

Good information, thank you. Yes, the pistons are dished to 20 cc if I remember right. I believe I should be around 9.5 to 1. I believe it has Moly rings, I'll ask the guy. Are there both Chrome moly and just Moly rings? I did the leak down at 2000 miles. It was leaking past the rings, very...

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...

Thanks everyone for the replys so far! As for break in. Any race engine that I know of is going to get hammered after the cam break in, oil change, and a cool down. It is pretty hard to dyno an engine "easy". So I'm going to rule that one out. I can't speak for a cracked ring and the engine...

I'll give that a shot. Thank you

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...