John9722

Hey all, I’m new and I have questions. I’ve always been a Ford guy, but upon looking into building an engine I can’t deny that LS is the way to go. Target vehicle for this engine is a 1998 Camaro Z28. I’ve owned fast cars before, but I’ve never built the engines myself, and that’s what I want to do, I’m just a little lost on what direction to go. I’m debating between either an LM7 5.3, or an LS1. Target power range will be 650-750 at the rear wheel, after forced induction. First off, which block will be more supportive in this power range? Also, I’m debating which route I should take as far as purchasing parts. I thought about buying a completely stripped, bare block from Summit or Jegs, but I also thought about seeing if I can find a block with the rotating assembly and heads already done, and continue it from there with the intake, exhaust, etc. basically just wondering what others have done and what routes have worked best for you. Thanks!

NAVYBLUE210

5.3 Truck engine from recycle yard, 12-15 psi turbo, mild cam 650+
Least expensive & fastest way. Search Joe Nova and others in
Forced induction section. Done many times, learn from others
Save money & time!
Good Luck

John9722

So if I go that route, do I need to change out/upgrade any of the internals, or will they handle 650-700 without an issue? Should I at least rebuild it? Also, I’ve read a lot on the 5.3 that the heads should either be ported (factory) or upgraded to Edelbrock or similar heads, any opinions?

G Atsma

You would be surprised at how tough the stock lower end on these engines is. If the junkyard motor checks out as not badly beaten, maybe a new oil pump and timing chain would freshen it up well enough for a stint under pressure.

John9722

What about just buying a bare LM7 block and putting a stock rebuild kit in it along with ported heads, any issues making high hp there?

G Atsma

You'd be better off with a good junkyard engine and rebuild it. That way you get all the small parts you'd have to hunt down, plus they would add up quickly money-wise if bought separately.