jja Posted February 2, 2017 Share Posted February 2, 2017 Appreciate any thoughts on what you would recommend for following situation: Have at least 160 k miles on a 1970 SB 350 ci. engine. Had each cylinder compression tested and they all registered between 190 -210 lbs., except no. 7 which tested about 120 lbs. Engine really seems to idle hard and have a small leak that I think is the rear main seal. Would like to take care of things as inexpensively as possible but hate to be dumb cheap. Should I go ahead with full engine rebuild or can I resolve most of the things that bother me with a valve job and replacement of rear main seal and motor mounts? Any thoughts? Quote Link to comment Share on other sites More sharing options...
Leghome Posted February 2, 2017 Share Posted February 2, 2017 I could have had my engine rebuilt for around $1500. Ended up spending $2250 because I went with a roller cam and roller tip rockers. Very pleased with the results. Has a nice little lope at idle and really sounds good with the 2 1/2 inch stainless exhaust going thru flow master 50's. Quote Link to comment Share on other sites More sharing options...
GatorDog72 Posted February 2, 2017 Share Posted February 2, 2017 Unless you have deep scoring on the cylinder walls, you could get away with doing a valve job and a quick hone with new piston rings. This is a quick fix and won't last forever. If you want it to go another 160k without issues, I would just bite the bullet and rebuild the entire thing. Quote Link to comment Share on other sites More sharing options...
dejh22 Posted February 3, 2017 Share Posted February 3, 2017 What is the old saying? A chain is only as stong as it's weakest link. If it were me I would go thru the whole engine. Are you doing all the work yourself? If not, you could end up paying a lot on labor having to pull the engine twice. Quote Link to comment Share on other sites More sharing options...
Mo's70MCs Posted February 3, 2017 Share Posted February 3, 2017 Redoing the top end and not doing anything to the bottom end is a big rookie mistake. The bottom end is sure to follow. “There’s never enough time to do it right, but there is always enough time to do it again" One of Murphy's laws. Quote Link to comment Share on other sites More sharing options...
Rob Peters Posted February 3, 2017 Share Posted February 3, 2017 To what Rod said. rob Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted February 4, 2017 Share Posted February 4, 2017 ok now....160,000 miles on it, you know the answer Quote Link to comment Share on other sites More sharing options...
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