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Hello guys, rebuilding a stock C5 LS1 (yes bone stock rebuild). Just a normal car... no racing. I id not have a meter angle gauge to torque the connecting rods... I used the sharpie method... but now that i recall i thinks i went 15ft-lb +100-120° instead of the 15ft-lb +75° it has to be.
My question is would this bring a problem because the oil clearance now is too tight?? Should I use a lower weight oil? Or is this okk? (The pic is what i got before install at 15 + 75ish°)
First, you should spend a few bucks and have that crank polished, it’s not that much to have it done and makes for a much nicer accurate surface.
Toss that plasti-gauge. Bolt and torque your rods up with the bearings you intend to use, have your local machinist measure them with a dial bore gauge, subtract the the crank journal measurement and KNOW exactly what have. This way you’ll know if you need to add/subtract clearance using different bearing shells and what oil pump you should use. Plasti-gauge is so high school auto shop.
First, you should spend a few bucks and have that crank polished, it’s not that much to have it done and makes for a much nicer accurate surface.
Toss that plasti-gauge. Bolt and torque your rods up with the bearings you intend to use, have your local machinist measure them with a dial bore gauge, subtract the the crank journal measurement and KNOW exactly what have. This way you’ll know if you need to add/subtract clearance using different bearing shells and what oil pump you should use. Plasti-gauge is so high school auto shop.
I dont have a micrometer thats why i used a plastigauge. ̀ did do it with the new bearings. We installed a new Melling 10265 pump (if i remember the part number correct
LOL, clearance won't matter when the bolts break from being overtorqued. Get new bolts, torque to the CORRECT spec, then you can get an accurate measurement of the clearance.
LOL, clearance won't matter when the bolts break from being overtorqued. Get new bolts, torque to the CORRECT spec, then you can get an accurate measurement of the clearance.
You over stretched the rod bolts. They are no good now. The engine will chunk a rod out the side of the block if the rod bolts fail.
It is possible over tightening them did that. Won't know until you tighten them correctly and check it.
The sharpie method is okay. The torque spec is 15 ft lbs plus 85 degrees and it's CRITICAL that it's right. A torque angle gauge is cheap and will ensure accuracy.
11-16-2019, 09:47 AM
Rod bearings too tight 
