Did I screw up?? Main/Rod clearance question..
#1233725
05/15/12 01:00 PM
05/15/12 01:00 PM
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Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
Jeepmon
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OP
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Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
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To avoid hijacking the other post, I'm starting this one for a little clarification help..
I'm currently in the middle of a 572, max effort, race only build.. Before dropping the parts off at the machine shop, I was confident in the bearing clearance of between .025-.030..
The machinist agreed with my spec's and did his thing on the new World block.. After picking up the parts, we measured the clearances for both the rod and the mains.. and they came in at .035 instead of the .024-.026 the machinist claimed on the build sheet..
Since the machinist missed a couple things on the block and since the clearances wasnt where we agreed, the machinist took the block back to finish it and I'm supposed to get the call today to come and pick it up..
In the other thread, there seems to be a consensus that the Rods/Mains should be anywhere from .030 -.050 for a big block, aluminum rod, race only motor..
So my question is.. Did I screw up by asking for .025 clearance??
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Re: Did I screw up?? Main/Rod clearance question..
[Re: Jeepmon]
#1233727
05/15/12 01:07 PM
05/15/12 01:07 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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I helped George finish up a fairly big N.M.R.A. motor and he actually set em up a bit tighter like .0025-.003 iirc which is where they were at teardown and at 3800lbs. it went 8.05 in Vegas..........your call.
Last edited by Thumperdart; 05/15/12 01:09 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Did I screw up?? Main/Rod clearance question..
[Re: 10sec440]
#1233731
05/15/12 02:50 PM
05/15/12 02:50 PM
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Joined: Nov 2004
Posts: 8,094
Sunnyvale, CA
Jeepmon
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Sunnyvale, CA
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Quote:
Just for clarity thats .0028"-.0030" right? If you have .030" clearance you're in big trouble! 
Yeah.. you're correct.. shoot, I'm just an electrician and our tolerance is 18".. give or take an inch or two..
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Re: Did I screw up?? Main/Rod clearance question..
[Re: Jeepmon]
#1233732
05/15/12 02:56 PM
05/15/12 02:56 PM
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Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,640
in a cattle trailer down by th...
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Quote:
our tolerance is 18".. give or take an inch or two..
That's what she said...
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Did I screw up?? Main/Rod clearance question..
[Re: Guitar Jones]
#1233733
05/15/12 04:08 PM
05/15/12 04:08 PM
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Joined: Feb 2003
Posts: 2,560
S.E. Michigan
cl440
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master
Joined: Feb 2003
Posts: 2,560
S.E. Michigan
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Quote:
Quote:
our tolerance is 18".. give or take an inch or two..
That's what she said...
Tree'd.....LOL 
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Re: Did I screw up?? Main/Rod clearance question..
[Re: Jeepmon]
#1233734
05/15/12 04:25 PM
05/15/12 04:25 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I'm sure you mean .0025 to .003 Treed also 
Last edited by MR_P_BODY; 05/15/12 04:26 PM.
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