Max compression
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Teching In
Joined: Jan 2017
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From: Fowler, Ohio
Max compression I'm a bit new and have a couplevel questions. If I run a lm7 stock 3.622" stroke with 6.125 rods, forged flat tops, 799 heads, and smallest head gasket I can run. How much would i need to mill the heads and what would I be in compression? This is a weekend warrior for the strip.NA.
Last edited by Joey Pizzurro; Jan 30, 2017 at 09:16 AM. Reason: Errors
Thread Starter
Teching In
Joined: Jan 2017
Posts: 19
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From: Fowler, Ohio
https://www.stevemorrisengines.com/s...iston-kit.html
I can call diamond? I kinda wanted to learn how to calculate it btw
I can call diamond? I kinda wanted to learn how to calculate it btw
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Joined: Mar 2014
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From: Ohio
It depends on what you mean by 'lots of spray'.
There are a few stock 4.8s and 5.3s taking a 300 shot.
My question, if you're paying for aftermarket pistons, why not get ones that give you the compression ratio you want? Its not like there is any additional cost..
There are a few stock 4.8s and 5.3s taking a 300 shot.
My question, if you're paying for aftermarket pistons, why not get ones that give you the compression ratio you want? Its not like there is any additional cost..
Thread Starter
Teching In
Joined: Jan 2017
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From: Fowler, Ohio
Well. I want around 12.1. Back to go ogling. And I won't get ones I don't want.. I was just behind on researching before I posted lol
Last edited by Joey Pizzurro; Jan 30, 2017 at 10:16 AM.
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From: Ohio
Bore it out to LS1 specs. You gain a lot more piston options then.
You could also use flat tops in the 5.3 and run .040" gaskets and have the chambers in the heads filled to get you close to 12:1.
You could also use flat tops in the 5.3 and run .040" gaskets and have the chambers in the heads filled to get you close to 12:1.
Thread Starter
Teching In
Joined: Jan 2017
Posts: 19
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From: Fowler, Ohio
I like the extra options but my block is already honed, decked, and hot tanked. I was only going to upgrade rod and pistons because I was told they are weak but if I can run 300 shots of spray I could just swap to the 4.8 flat tops and do what u said with the heads. Maybe a 228r 114lsa cam and go from there?
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From: Ohio
Get Gen 4 5.3 flat top pistons/rods. You won't break them unless you screw something up. They're as strong as any entry-level forged rod.
Even the gen 3 stuff is insanely strong compared to what most people are used to.
That's a pretty bad camshaft for 12:1 compression.
Even the gen 3 stuff is insanely strong compared to what most people are used to.
That's a pretty bad camshaft for 12:1 compression.
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Joined: Mar 2014
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From: Ohio
You can have someone like AI CNC you some heads and they will fill the chambers. The lowest I've seen is 54cc on stock truck castings. Any lower than that and I imagine you start shrouding the valves and losing too much flow.
AI can also weld up the chambers to increase compression.
Or run the Wiseco Junkyard Dog pistons for the stock rods and 5.3L... they make one that's +6cc dome that would get compression up with 799/243 heads.
https://www.texas-speed.com/p-4180-w...rist-pins.aspx
I'd also look at the TFS 205 Heads with 58cc Chambers. They are designed for the 5.3L bore and outflow a lot of stuff...
https://www.summitracing.com/parts/t...-c00/overview/
And why 12:1? It won't really make you any faster. 11.5:1 is plenty and easier to attain.
Or run the Wiseco Junkyard Dog pistons for the stock rods and 5.3L... they make one that's +6cc dome that would get compression up with 799/243 heads.
https://www.texas-speed.com/p-4180-w...rist-pins.aspx
I'd also look at the TFS 205 Heads with 58cc Chambers. They are designed for the 5.3L bore and outflow a lot of stuff...
https://www.summitracing.com/parts/t...-c00/overview/
And why 12:1? It won't really make you any faster. 11.5:1 is plenty and easier to attain.