Thread: fresh rebuilt 350 overheating rapidly and extremely low oil pressure

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wrong rotation water pump????????????


plastic guage??????? what bearing size did you use as you say your crank -.020


block 4.030????what size was your pistons??????


Too many under/mis stated conditions to determine your total condition

I went back with the .020 bearings as the that is what the machine shop said to use, I took the old ending block with the lower end still together to the shop as a whole. They checked everything and said that the lower end was quite reusable. this rebuild was just to try and gain some performance as the old engine was still running well. Went with a new water pump for a 1979 Chevrolet 350 k10. The old block was already bored the specs I gave are all from the old block as well as the new one both blocks have the same casting number on them. The timing is set at 8 degrees BTDC with a timing chain and gears set at 2 degrees retard, I was told that would give it a little more low end as was the whole point of the rebuild it just had way to much top end and no low end power. Since the post I pulled the thermostat it was stuck closed, removed it all together to see if that would alleviate the overheating did not stop it just slowed it down, I am still running the original clutch fan, wondering if that is not either the problem or part of the problem, I also changed the oil and filter gained 10psi on the oil pressure initially, then when i brought the truck down to an idle only had 5 psi again. I am considering using a thicker oil 10W-40 and changing the brand of oil filter currently has a Hastings on it. I have heard good and bad about them, then again I have worked 20 years in the parts industry and have heard good and bad on just about every brand out there. Also I will switch it back to a standard volume oil pump. Thanks for all the quick suggestions please keep them coming.

water pump is for a stock 350 1979 Chevrolet K10, yes sorry for the misspelling Plastic guage, crank had .020 bearings and so did the rod bearings, both blocks 4.030, pistons 4.030 Hope that can help you help me

Originally Posted by jerry clayton

wrong rotation water pump????????????


plastic guage??????? what bearing size did you use as you say your crank -.020


block 4.030????what size was your pistons??????


Too many under/mis stated conditions to determine your total condition