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Lm7 5.3 build

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Old 05-27-2019, 04:53 AM
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Default Lm7 5.3 build
I'm throwing together a lm7 with stock crank and rods, flat top pistons, btr stage 3 truck cam, tbss manifold, and some ported 862 heads I was wondering what kind of power this will be making at the crank and a guesstimate of what itll be at the wheels
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Old 05-27-2019, 07:58 AM
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Originally Posted by 'James Miguel
I'm throwing together a lm7 with stock crank and rods, flat top pistons, btr stage truck cam, tbss manifold, and some ported 862 heads I was wondering what kind of power this will be making at the crank and a guesstimate of what itll be at the wheels
300 wheel 380 crank
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Old 05-27-2019, 10:23 AM
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BTR Stage truck cam? WHICH stage??
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Old 05-27-2019, 11:02 AM
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Originally Posted by Mavn
300 wheel 380 crank
Btr stage 3 I didnt see that error whoops
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Old 05-27-2019, 01:22 PM
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What compression are you shooting for?
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Old 05-27-2019, 01:37 PM
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Originally Posted by Che70velle
What compression are you shooting for?
10:1 give or take I'm not really trying to go super fast it's just gonna be a weekend cruiser thats has some pep in its step
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Old 05-28-2019, 02:00 AM
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Originally Posted by 'James Miguel
I'm throwing together a lm7 with stock crank and rods, flat top pistons, btr stage 3 truck cam, tbss manifold, and some ported 862 heads I was wondering what kind of power this will be making at the crank and a guesstimate of what itll be at the wheels
Originally Posted by 'James Miguel
10:1 give or take I'm not really trying to go super fast it's just gonna be a weekend cruiser thats has some pep in its step
An LM7 5.3L has a factory dish piston of 8cc and is basically 9.5:1 factory rated.

If you replace that with a Flat top piston you will have nearly 10.5:1 compression.


LM7 5.3L Stock

LM7 5.3L Flat top
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Old 05-28-2019, 06:03 AM
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I'm still at 300 ish wheel. Depending on dyno, converter, rearend etc
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Old 05-29-2019, 01:57 PM
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sounds like what i'm wanting to do! except 243 heads
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Old 05-29-2019, 02:51 PM
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i did 341 thru a 6speed lol
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