383 sbc...are small base circle cams always necessary? - Chevelle Tech

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post #1 of 9 (permalink) Old May 8th, 04, 2:37 PM Thread Starter
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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!
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post #2 of 9 (permalink) Old May 8th, 04, 3:09 PM
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i have those exact rods for my 385 stroker smallblock and am hoping for an answer also.i'm thinking only the block will need clearancing.lets keep our fingers crossed!
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post #3 of 9 (permalink) Old May 8th, 04, 3:36 PM
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ive got a xe294h and i had to clearance my rods a bit. ive got the standard scat 5.7" i beam 4340's
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post #4 of 9 (permalink) Old May 8th, 04, 3:48 PM
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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.
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post #5 of 9 (permalink) Old May 8th, 04, 4:23 PM
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stock block, comp 280H, scat 9000 crank, stock 5.7's with ARP bolts, I had to sell the comp 280H and order a small base cam......

Disclaimer: I can't spell.
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post #6 of 9 (permalink) Old May 8th, 04, 5:04 PM
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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
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post #7 of 9 (permalink) Old May 8th, 04, 5:52 PM
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Quote:
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!

Roger Copeland
"Only a rich man can afford cheap parts, because he can afford to replace them."
R&R Racing
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post #8 of 9 (permalink) Old May 8th, 04, 7:43 PM
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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.
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post #9 of 9 (permalink) Old May 8th, 04, 7:44 PM
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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
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