455 pontiac main and rod clearances
#2
Re: 455 pontiac main and rod clearances
Going by the .0011 x journal diameter rule that makes the clearance to shoot for .0035.
You gotta measure the journals, then set the bore guage to that journal size, set the bearings in the block, TQ down the caps and see what your clearance is.... repeat and change bearing shells till ya get it right.
Bret
You gotta measure the journals, then set the bore guage to that journal size, set the bearings in the block, TQ down the caps and see what your clearance is.... repeat and change bearing shells till ya get it right.
Bret
#3
Re: 455 pontiac main and rod clearances
For a street car shoot for .002 on both. A race car can have .0025-.003 depending on max rpm. I had my crank reground to reduce it from .0035 to .002 and I've run mine up to 7200 rpm.
#4
Re: 455 pontiac main and rod clearances
Originally Posted by Sporter28
For a street car shoot for .002 on both. A race car can have .0025-.003 depending on max rpm. I had my crank reground to reduce it from .0035 to .002 and I've run mine up to 7200 rpm.
You spin a 3.25 main Poncho regularly to 7200 with .002 main clearance? If so, you are lucky.
#5
Re: 455 pontiac main and rod clearances
Originally Posted by Sporter28
For a street car shoot for .002 on both. A race car can have .0025-.003 depending on max rpm. I had my crank reground to reduce it from .0035 to .002 and I've run mine up to 7200 rpm.
Keep on running at .002" and you are going to gain some babbitt/steel welding experiance.
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whuzizname
Automotive News / Industry / Future Vehicle Discussion
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07-22-2002 07:52 PM