sbc stroker eng. assembly - Team Camaro Tech
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post #1 of 3 (permalink) Old Apr 8th, 04, 10:54 PM Thread Starter
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Join Date: May 2003
Location: Hawaii
Posts: 373

I am currently building a 434 sbc(street car with some strip use). I just got my block and rotating assy from machine shop.I paid for clearancing,boring,decking,balancing etc...

I can see where they clearanced the rods for the cam and also where the block was clearanced for rods and counterweights.

My question is what is the min. clearance? I have read .050"-.060". I have .040" between counter weights and pan rail/webbing area in some spots.Also have min. .040 between rod bolt heads and pan rail (I have the eagle 4340 h-beams with the larger 1/2" bolt heads, L19 option)

Between rod and cam lobes I have .042" min on one rod. .044"-.055" on three rods and the other four are all ok.I did not degree the cam for this ,just dot to dot on chain(my buddy has my degree wheel,I will degree and recheck again)

Machine shop has a good reputation and builds a lot of performance motors( Lots of strokers 383's and 540's) But I don't think many are 4" stroked sbc's.

Any info appreciated, thanks in advance. Ray

Dart little M block steel caps (std. deck height and rails)
eagle 4340 4" crank,internal bal.)
eagle 6" h-beams w L19 bolts)
JE 4.155 flat top pistons
UDharold/Lunati solid billet roller small base
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post #2 of 3 (permalink) Old Apr 9th, 04, 02:23 AM
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,288

We shoot for .050" but .040 should be fine. Just think about it ... if the rod or the crank moves even .020" you have more serious problems than you want, so .040 is more than enough.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner

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post #3 of 3 (permalink) Old Apr 9th, 04, 07:41 AM Thread Starter
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Join Date: May 2003
Location: Hawaii
Posts: 373

Thanks BillK! Thats a big relief, didnt sleep too good last night LOL. I guess i'm kinda picky especially when the parts cost so much, Wanna do it right the first time.

In fact I purchased two set of cam bearings LOL. First cheap set to do mock up and clearancing, second premium set installed after all machine work and thorough block cleaning.My buddies think i'm a dork for doing that but I have a lot invested.

BillK I see you own a machine shop,I have another question if you dont mind.

With std. clev 77-h bearings I get .0015" on mains 1-4 and .002 on rear. I ordered extra clearance bearings that should give me .001" more clearance so I should have .0025" on 1-4 and .003" on rear.

My question is should I leave the rear at .002" or .003"

Thanks, Ray
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