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Boosted LM7???

 
Old 05-03-2017, 01:55 PM
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Default Boosted LM7???

Ima keep it simple.
Until I wanna drop the funds for a real build, I'm going to purchase an iron block 5.3 and throw a turbo at it with stock bottom.
Should I throw 317 or 243 heads on it?
I need the lower compression, of course, I just don't know what heads will benefit me the most.
Is there another head that I could use?
hoping for anywhere between 700-800 rwhp
This will be a drag car with some street use.
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Old 05-03-2017, 04:54 PM
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You do not need to lower the compression.
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Old 05-03-2017, 05:16 PM
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Check out Mat Happel's stuff over at "sloppy mechanics". There is a wiki page and numerous YouTube videos all all about cheap LSx turbo builds.
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Old 05-04-2017, 09:25 AM
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I'm putting 4.8L flat tops in a LM7 with 317's.
With a .040" head gasket should get me right around 9.5-9.6 compression.
I wouldn't go any lower than that.
317's on a dished 5.3 piston is like 8.6 compression which is no bueno lol.
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Old 05-04-2017, 11:32 AM
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Originally Posted by The ****** View Post
I'm putting 4.8L flat tops in a LM7 with 317's.
With a .040" head gasket should get me right around 9.5-9.6 compression.
I wouldn't go any lower than that.
317's on a dished 5.3 piston is like 8.6 compression which is no bueno lol.
Does the lm7 have flat top pistons?

Never mind lol
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Old 05-05-2017, 10:20 AM
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Originally Posted by WPlatt View Post
Does the lm7 have flat top pistons?

Never mind lol
No worries lol, if you haven't purchased any heads I'd roll with 243's.
I've been told by a reliable source they flow better and have better chambers than 317's.
I'm only using 317's because I have them and they're CNC ported by a guy who trained at SAM.
With 243's you'll be low 9:1 compression making your tuning window bigger and more boost on pump swill to help you get to that 700whp mark.
I am no expert by any means and I'd suggest reaching out to someone like John Bewley at LJMS for his experience and one of his cams lol.
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