Swapping crankshafts
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Joined: Nov 2009
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From: Salt Lake City, Utah
Swapping crankshafts
I have a 390 that I would like to stroke. I have read about using the crankshaft from a 428 to stroke it to a 410. Would I need to use the 428 connecting rods as well as the crankshaft, or can I use the 390's connecting rods?
Also, what is the tolerance for boring out a 390?
Also, what is the tolerance for boring out a 390?
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Joined: Apr 2004
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You should be in the FE forums.
At the top of that forum is a FAQ sticky. It addresses overbore tolerance, and it ain't much. .060 can be a question mark on some blocks due to core shift.
Rod lengths are the same. (Only 352 & 360 are different) The 410 used a shorter compression height piston to make it fit.
You can scour the yards for a 428 crank, but if you find one, it's probably in a 410 or a 428, so the smart money would be to buy the whole thing.
Aftermarket cranks can get you out to over 410 or even 428 (with a .030 overbore). IMO, if I was going to do this, I'd go big.
This info is from older car engines, but the dimensions are the same as newer trucks. Combustion chamber sizes and compression ratios, along with cams and pistons are generally different in truck motors.
FE Series Engine Specification Chart
Scat Crankshafts
Eagle Specialty Products, Inc. - Search by Application
At the top of that forum is a FAQ sticky. It addresses overbore tolerance, and it ain't much. .060 can be a question mark on some blocks due to core shift.
Rod lengths are the same. (Only 352 & 360 are different) The 410 used a shorter compression height piston to make it fit.
You can scour the yards for a 428 crank, but if you find one, it's probably in a 410 or a 428, so the smart money would be to buy the whole thing.
Aftermarket cranks can get you out to over 410 or even 428 (with a .030 overbore). IMO, if I was going to do this, I'd go big.
This info is from older car engines, but the dimensions are the same as newer trucks. Combustion chamber sizes and compression ratios, along with cams and pistons are generally different in truck motors.
FE Series Engine Specification Chart
Scat Crankshafts
Eagle Specialty Products, Inc. - Search by Application
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