guesstimate what power my 5.3 lm7 is making

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6spdg37s

Master Mechanic
Oct 21, 2016
369
259
43
LM7 5.3 with :
ported/milled 243 heads
comp cams 232/234 .595/.598 110LSA cam
holley 670 cfm carb
holley mid rise carb intake manifold
msd LS box
msd wires
no a/c
electric fans
TSP 1-7/8 long tube headers that will be going to a 3" x-pipe then to (2) black widow widowmaker 3" mufflers to a dump pre-axle

if i had to guess i would say 430ish crank. 400ish wheel but im not sure, im basing this off of other articles i read about builds and such.

im not trying to say my engine is making X amount of power im more so just curious what its doing dont know when ill get a chance to get it on a dyno
 

motorheadmike

Geezer
Nov 18, 2009
8,976
27,522
113
Saskatchewan, Truckistan
425/390.
 
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Texas82GP

Just-a-worm
Apr 3, 2015
7,989
18,702
113
Spring, Texas
I agree with both of you. Peak power is probably around 6200 or so.
 
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82LSGDADDY

Not-quite-so-new-guy
Nov 28, 2017
10
13
3
Goldsboro NC
My guess would be 330 wheel. Thats just based on what my 6.0 dynoed with similar cam. mine done 360whp . All dynos vary a bit as well and the one i used was said to be a little stingy. My motor is all new with good parts and very reputable builder . Post back when you get it on the dyno. I thought my numbers were going to be closer to 400whp but the builder was right on the money with his estimate. I didnt read that heads were done, in that case yea you probably are close to 400whp but only 1 way to find out :)
 
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zdeckich

Master Mechanic
Jun 23, 2013
460
346
43
Fort Worth, TX
335-350rwhp. is my guess. Thats a low LSA lol. At least it will have a nice chop lol. What springs you running in the 243's?
 

Injectedcutty

G body LS mafia
Nov 24, 2014
6,057
22,811
113
Louisville, KY
335-350rwhp. is my guess. Thats a low LSA lol. At least it will have a nice chop lol. What springs you running in the 243's?
The OP hasn't been on in quite awhile. He was talking about selling the Monte months back.
He has the same springs I have in my 5.3, BTR .660 platinums.
Makes me curious what mine will do prior to becoming "under pressure". I'm sure it will be similar as I'm running a Tick Stage 1 turbo cam with .613/.598 lift on a 114LSA.
 
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