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Why not try a newer cam grind? Straightline makes some good cams. I think the 6 pack pistons should be ok w/ a 557. after you subtract the lash you're about 537 or so.

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Straightline no longer exists and he does spec a good cam ( I have a roller of his on the shelf) but they are someone elses grind??
Since everyone has a cam almost exactly the specs
of the 509 lift duration and LSA so buying from Comp cams or other makes it a new cam. these cams make serious power that's why they are copied.
Now for the guys that need/want less performance and some of the issues that come with them there are Summit brand cams!!!
There is probably something to the longer exhaust duration verses the intake but most still sell the even split and many builders perfer them so it is Tomato Tomato???

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I talked to Scott the other day. I will be buying one of his cams soon. 236 (@.050) 550 solid. If you want his # PM me. Also the Summit 488 cam is pretty good. Got it to run 12.90 in a mild 9:1 440 in a 3900 lb B-body.