Forged Pistons
Thread Starter
Teching In
Joined: Apr 2024
Posts: 6
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From: South Dakota
Forged Pistons What would be the optimal PTW clearance for Forged pistons? I understand they swell a little more than Hyper. I’m running 10 psi boost Pro Charged? Any input greatly appreciated!
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Joined: Jan 2008
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From: Ohio, Georgia, Nevada, Texas
Summit Pro Ls pistons are 2618 and run with .004 piston to wall metal to metal. The skirt coatings take up some of that for less net clearance. The skirt profile (cam and taper) is critical to good wear and less cold start noise. Here’s a good article on what to look for in a good forged piston. https://www.onallcylinders.com/2019/...s-engine-easy/
Thread Starter
Teching In
Joined: Apr 2024
Posts: 6
Likes: 1
From: South Dakota
When I get the Block cleaned up not sure if .005 or .010 will be the number can I just contact summit tech support and get help putting together the correct Forged rotating assembly?
LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,233
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From: Ohio, Georgia, Nevada, Texas
Almost that easy. We currently have pistons in 4.005 bore but skip to 4.030 after that and have .040 too.
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LS1Tech Sponsor
Joined: Jan 2008
Posts: 2,233
Likes: 1,523
From: Ohio, Georgia, Nevada, Texas
Now those we have in spades…+4.080. We have the 6.125/.927 versions and the 6.098/.945 versions. The 6.098 rod version’s bigger pins are stronger so we recommend those for boost. Here’s a selection for you.
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