When building a 383 sbc stroker engine, is it always necessary to use a small base circle camshaft for clearence issues. I am using Scat 6.0 4340 pro I beam rods, designed for stroker engines, these have the ARP 7/16" cap screws. Scat says they are clearenced for stroker engines. Thanks!
My 383 did not require special cam clearancing. BUT I am using an old Crane 274H, results may vary. Scat 9000 crank, Eagle SIR 6.0" rods, Crane 274H "3/4 Race cam". My block had to be ground like crazy, but the cam was ok. I will be finding out how it fits with a Comp XE262 in a couple weeks. I hope I don't run into any problems.
scat 5.7 H rods. comp 294hr standard base circle cam. a few of the rod bolts had to have very minor relief work. Ive always thought about the trade offs between the 2 different size cams. theres got to be advantages and disadvantages to both. 2 very good thoughts come to mind. Dave
Originally posted by fatmattbbc: When building a 383 sbc stroker engine, is it always necessary to use a small base circle camshaft for clearence issues. ...
In a word... NO!
We ran a 383 in a stock block with Summit Proline rods with a variety of hydraulic, solid flat tappet and roller cams (with up to .766" lift) and all of them were standard base circle. The key is the rods!
"Only a rich man can afford cheap parts, because he can afford to replace them." R&R Racing
ZZ4 block, Manley Sportsmaster 4340 Capscrew rods, GMPP HR Hot Cam. - no grinding to the block, very minor grind to a couple of the rods, to provide adequate cam clearance, although none were actually hitting.
even with a mild cam and stroker clearance rods you can have problems..it all depends on the core shift of that particular block...if you look at the front of the block, theres a flat spot where the cam bearing is...the cam is supposed to be centered in that pad...a lot of times you will find its moved down..this can cause clearance problems