Oddball Bore and Stroke combo recommendation
Thread Starter
Teching In
Joined: Oct 2018
Posts: 6
Likes: 1
From: Washington
Oddball Bore and Stroke combo recommendation Hey guys,
So I dropped off an LM7 block with a local builder a while back and my number is finally up. Ideally I wanted to bore it out and stroke it to a 383 but the block’s walls don’t look like they’ll take it much past 40 overbore.
TLDR, the builder is trying to recommend that I use the 4.00” stroke but only bore the block 30 over. That seems a little wonky to me, considering not many people (or Chevrolet performance) run a 3.830 bore 4.000 stroke.
Is this actually a good recommendation or should I just spend a little more money and go pick up a new 6.0 block from Chevrolet and be done with it?
-Cole
So I dropped off an LM7 block with a local builder a while back and my number is finally up. Ideally I wanted to bore it out and stroke it to a 383 but the block’s walls don’t look like they’ll take it much past 40 overbore.
TLDR, the builder is trying to recommend that I use the 4.00” stroke but only bore the block 30 over. That seems a little wonky to me, considering not many people (or Chevrolet performance) run a 3.830 bore 4.000 stroke.
Is this actually a good recommendation or should I just spend a little more money and go pick up a new 6.0 block from Chevrolet and be done with it?
-Cole
LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,234
Likes: 1,524
From: Ohio, Georgia, Nevada, Texas
We're doing a project with Matt Happel at Sloppy Mechanics that is very similar. Boosted 363 Cube deal with .005 overs with a L33 block. To go .030 over (365 Cid.) with a 4" crank and maintain higher compression, you may want to look at a SUM-R24408105 rotating kit. We have a lower compression version as well for boost.
Bore the 6.0 and do a 4" stroke 
Go big!
(I'm all for recommending the spending of your money lol)
Edit: sounds odd it'll only take .040, I thought it was common to take a lm7 out to 3.9" bore without issue
Go big!
(I'm all for recommending the spending of your money lol)
Edit: sounds odd it'll only take .040, I thought it was common to take a lm7 out to 3.9" bore without issue
