307 with bad crank

torquemonster · 11-16-2006, 10:32 PM

Hey just got registered. Have a bad crank in an 86 307 cutlass, had a barely noticable knock when warm. dropped pan only to find the forward most rod bearing had spun, heres the question , also have a good early 80's(with 5a heads) 307, will that crank and rod(s) swap into the 86 noting that the later one is a roller cam motor. Any advice would be appreciated. Would like to keep it as original as possible, so I don't want to drop in a different motor. Car had been parked since 02' and only has 34,000 original miles.

olds 307 and 403 · 12-02-2006, 04:39 PM

No the later 307's have full floating rods and different pistons. Not a direct swap as the early 307 have press fit rods.

11-16-2006, 10:32 PM	#1 (permalink)
torquemonster Junior Member Join Date: Nov 2006 Posts: 2	307 with bad crank Hey just got registered. Have a bad crank in an 86 307 cutlass, had a barely noticable knock when warm. dropped pan only to find the forward most rod bearing had spun, heres the question , also have a good early 80's(with 5a heads) 307, will that crank and rod(s) swap into the 86 noting that the later one is a roller cam motor. Any advice would be appreciated. Would like to keep it as original as possible, so I don't want to drop in a different motor. Car had been parked since 02' and only has 34,000 original miles.

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12-02-2006, 04:39 PM	#2 (permalink)
olds 307 and 403 Junior Member Join Date: Dec 2006 Posts: 4	No the later 307's have full floating rods and different pistons. Not a direct swap as the early 307 have press fit rods.