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Head bolts for LM7 5.3

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Old 04-24-2012, 01:07 AM   #1
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Default Head bolts for LM7 5.3

What head bolts should I use on a LM7 5.3 with 6.0 heads for boost?

Gasket recommendation?
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Old 04-24-2012, 01:10 AM   #2
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Not exactly what year, but crank is 12552216, block is 12567392, 24x wheel
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Old 04-24-2012, 01:19 AM   #3
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Hmmm... .857 NARROW FLANGE crankshaft. Any problems with this working with a glide or turbo 400? I read somwhere on here that I needed a different flange crank .875?

Seems to me all I need is a flexplate and LS to TH400 converter
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Old 04-24-2012, 01:36 AM   #4
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found this is what I need to run a Lm7 with a Th400 or Glide

Crankshaft spacer# GM 12563532..Bolts# 12563533
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Old 04-24-2012, 01:40 AM   #5
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Quote:
Originally Posted by PACKETFOCUS View Post
What head bolts should I use on a LM7 5.3 with 6.0 heads for boost?

Gasket recommendation?
OEM 6.0 Head gaskets and arp bolts...studs it ya wanna spend the $$$, but it all depends on how much boost ya wanna throw at it. 15-18 should be no problem with a good set of bolts.
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Old 04-24-2012, 01:44 AM   #6
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yeah this is just a budget setup to play around with a turbo on a stock shortblock. May try to push it to 20lbs for a couple passes.

Got two lm7 shortblocks on a good deal so I gotta backup hehe.

Thanks for info. Didn't know if Ls9 head gaskets would help or not.
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Old 04-24-2012, 11:40 PM   #7
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Ls9 head gaskets are 5 or 7 layer and made for boost I would use those if possible.
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Old 04-25-2012, 03:47 PM   #8
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There's a Youtube video of a silverado 5.3L pushes it up to 24lbs. it's a dyno vid and supposedly is crankin 2000ponies ,,,,,,,course it would'nt last too long but a cpl passes should be no problem depending on mileage of You're engines.
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Old 04-25-2012, 03:47 PM
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