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Old 09-24-2006, 07:57 AM
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cam clearance in a 383

hey fellas got a little problem here. i have a comp cams 292h "244 at .050" magnum. the problem is this i have heard that my rods will smack this cam as it turns. is there any truth to this or is it a bigger cam that does this. i have the block almost ready to put back and want to do it right the first time. if so , what would be a good clearance between the rods and the cam. ADAM

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Old 09-24-2006, 08:09 AM
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If this cam was not ground on a small base circle, you may well have clearance problems. Check the serial # of the cam with Comp's tech reps to determine whether the cam was ground on a standard or small base circle core.

Paul
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Old 09-24-2006, 08:26 AM
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I did a 383 a year ago and the rods did hit the cam and the block and the oil pan. I was able to get the rods to clear the cam by grinding some clearence on the rod. It hit at the very edge of the rod were the rod bolt goes thru. Then I had to grind the block for the rod bolt nuts to clear. The oil pan got the clearence it need with a small ball peen hammer. Lots of extra work but no extra cost. I would assemble the short block with out the rings to make sure it all clears. Then have it balanced. I put about .060" clearence between the rods and cam.
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Old 09-24-2006, 09:33 AM
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Quote:
Originally Posted by backyard71nova
hey fellas got a little problem here. i have a comp cams 292h "244 at .050" magnum. the problem is this i have heard that my rods will smack this cam as it turns. is there any truth to this or is it a bigger cam that does this. i have the block almost ready to put back and want to do it right the first time. if so , what would be a good clearance between the rods and the cam. ADAM
It's not the fault of the cam. The cam will fit and clear with stock GM rods designed for a 3.75" stroke, it's the non-stock rods that cause the clearance problems. Do you use the stock GM rods designed for this application? I see you've pretty well described the cam, can you describe the rods?
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Old 09-24-2006, 11:45 AM
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rods

eagle i-beam with arp waveloc bolts, am also considering scat rotating assembly with h-beam rods.also with waveloc bolts
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Old 09-24-2006, 11:48 AM
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383

Quote:
Originally Posted by RPM
I did a 383 a year ago and the rods did hit the cam and the block and the oil pan. I was able to get the rods to clear the cam by grinding some clearence on the rod. It hit at the very edge of the rod were the rod bolt goes thru. Then I had to grind the block for the rod bolt nuts to clear. The oil pan got the clearence it need with a small ball peen hammer. Lots of extra work but no extra cost. I would assemble the short block with out the rings to make sure it all clears. Then have it balanced. I put about .060" clearence between the rods and cam.

THANKS A MILLION, was there plenty of room for the crank throws? i'm scared to death that i won't have enough clearance and under load the crank will hit
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