[spectramitch]

I had my machine shop rework and drop the caps to tighten up my main bore housing to be on the small size of spec 3.1880. Now im getting clearances in the .0022 range. I am using King HP bearings and want to run a 30wt oil. Is the .0022 on the mains to tight for a street strip 3" main? Its a Scat forged 4.25 stroke, 12-1 compression SR cam.

[mgarblik]

By "drop the caps", I assume that means cutting the caps? After they were done doing that, did they line hone the housing bores to make them round again and remove any taper from cutting the caps? There is a little more to finishing this up than just cutting caps. Your installation work of the caps looks very nice, just make sure it is finished 100%. I don't like to run a block without line honing. I like to finish the housing bores on a 3" main block at 3.1883-3.1884. I like 80% of the bore diameter to gauge at +-.0001 of that dimension with some growth toward the parting line. I like all 5 mains +-.0001 in taper. If you have those dimensions, your King bearings will have around..0028"-.0032 oil clearance. Looking really nice so far.

[spectramitch]

Originally Posted by mgarblik

By "drop the caps", I assume that means cutting the caps? After they were done doing that, did they line hone the housing bores to make them round again and remove any taper from cutting the caps? There is a little more to finishing this up than just cutting caps. Your installation work of the caps looks very nice, just make sure it is finished 100%. I don't like to run a block without line honing. I like to finish the housing bores on a 3" main block at 3.1883-3.1884. I like 80% of the bore diameter to gauge at +-.0001 of that dimension with some growth toward the parting line. I like all 5 mains +-.0001 in taper. If you have those dimensions, your King bearings will have around..0028"-.0032 oil clearance. Looking really nice so far.

They cut the bottom of the caps and said it did not need the line hone. There is growth at the PL somewhere around .001 a side. I believe there is slight taper the worst being .0003 from front to back of a journal. I might find another shop to run a line hone through it.

[mgarblik]

Originally Posted by spectramitch

They cut the bottom of the caps and said it did not need the line hone. There is growth at the PL somewhere around .001 a side. I believe there is slight taper the worst being .0003 from front to back of a journal. I might find another shop to run a line hone through it.

I wish you were closer. I am in Dayton, OH. It probably needs 1 full pass. Then flip block and make 1 half to full pass and it would be done and just right.