TBMG270
Newbie
Buddy of mine has this 400 laying around he told me I could have. Gave it a once over and noticed it looks like it's cracked. Only its real shallow and looks awfully uniform to be a crack. I'm not entirely sure so figured I'd get some other opinions on it. Was also wondering if anyone's used a 400 in place of a vortec 5.7? I have a 96 k1500 with the 5.7 and a 5 speed. Originally auto but I solved that problem already. Oil cooler line blew out on me about a month ago and leaked all the oil out. Spun a few bearings and destroyed the cam, so I bought a short block from a local yard and that one also had a spun bearing. Took it back and they gave me an entire motor this time from a truck that was wrecked. Everything looked in great shape and couldn't feel any play in any of bearings, cylinder walls were nice, had good compression. Decided not to mess with the bottom end and just swap over my head's an intake and whatnot. Got it running and seemed alright. Made 40 psi oil pressure cold. Once it was warm it dropped down to around 20-25 psi at idle. Driving it the oil pressure would drop when accelerating and rise back up once I let off. Still stayed around the 15-20 mark at the least. It ran for 2 days and it was barely driven at all those 2 days. Last time I drove it it had 15 psi or so while driving. I pulled in my driveway and came to a stop and the oil pressure fell below 5. Shut the truck off and let it cool, went to verify oil pressure with a mechanical gauge. 30+psi on startup and fell below 10 when it was warm. Once it got warm this motor also started knocking. Go figure. I'm running pretty low on funds right now and need to fix this thing as cheap as possible. The yard won't warranty the motor a second time and most places around me want around a 1000 for 150k+ mile motor. I can't afford to spend that much at the moment and was thinking I might be able to get away with using this 400 if I could. I do have a tbi 350 laying around that ran when it was pulled but it's out of my old truck which was wrecked and became a woods beater. I've overheated it countless times and it spent more time at WOT and 5k+ rpm than it did at idle so I'm a little hesitant to use that one. It was always low on oil too because the pan leaks. I tried to blow it up numerous times and it refused to quit. Still don't know about throwing it in my daily tho.
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