and the guy I am buying it from has a bunch, and i am torn. i sitll cant decide between the sb 400 and the 350. i have heard that the 400 will have problems with overheating, just am not sure. it is bored, and only has 10,000 miles on a rebuild. i just dont want to be kicking myself later if i am going to run into a lot of problems with it. any help is greatly appreciated
Chances are that the radiator is a 3 core since it came out of a diesel. Take a look to make sure.
The heat problem is in the heads. They need "steamholes" drilled in them. Chances are it's already been done. The 400 has siamesed cylinders (like a lot of the bowtie blocks) so heat builds up at the bottom of the cylinders and cooks things. It's also one of the main reasons racers don't recommend you grind more than .010" off the cylinders since you might develop distortion. I wouldn't worry about it though. As long as you've got steamholes you'll never have a problem with it that you wouldn't with a 350.
The diesel rad. that was in my truck was a masive 4-core with both trans and oil coolers. It just gave up the ghost the other week and a replacement one for it coast $310. [img]images/graemlins/frown.gif[/img] So I got a smaller 3-core out of another truck for now till I get the cash. As for which engine just think of the saying "there is no replacement for displacement."
also see what it has been bored to, both a reasonable bore I would go with the 400. If you are going to rebuild it get rid of the 400 rods. A 400 can go more than 10 over but if you buy one especially to rebuild make sure you guys work out that if it sonic checks bad or there are cracks then he aint keeping your money for a bad mill.
Are you going to rebuild it or just plop it in or what? That determins what checks you should do......
Pick the 400. I love mine. No replacement for displacement right. I think ever deisel radiator I;ve seen has been pretty massive and we almost put one in my buddys truck this has a bad radiator, he has a 350 though, but to make it cool the best. I have a stock 3 row on my truck and don't have heating problems with my 400sbc.