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Thread Starter
Registered User
Joined: Sep 2024
Posts: 1
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Help 
Just picked up this freshly rebuilt 5.7 ‘boost build’ the guy I bought it from has no details on the build or who built it, it is ported and studded and all arp bolts. I’m building a 94 ranger prerunner so boost isn’t in the budget right now. Going to try to hunt down whoever built this as best as I can and if anyone can give me any advice or lead me any direction that would be awesome. Anyways, how much of a dangerous game would I be playing to run the motor NA?
TECH Fanatic
Joined: Jan 2018
Posts: 1,250
Likes: 239
From: Dade City, Fl.
Why would it be dangerous? LS engines are known to run great with boost with the "stock" factory build. If you don't know anything about it, why believe it is actually a "boost" build. If it is ... it is usually just forged internals and maybe a little lower compression. Don't worry about it and run it!
Joined: Apr 2006
Posts: 3,909
Likes: 1,158
From: Grand Rapids, Michigan
If you're that concerned, buy a cheap borescope and see what the pistons look like through the spark plug holes. You'll know if they're dished, flat top, etc. But yes, you can run it N/A just fine, even if it's only 9:1 compression.
