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'99 5.3 whp estimate?

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Old Apr 9, 2013 | 01:00 PM
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Default '99 5.3 whp estimate?
99 5.3
Aftermarket: piston rings, rod bolts, rotating assembly bearings
Comp blower cam
Main girdle
oil pump
706's: ported
Dual springs
rr's
valve girdle
Edelbrock pro flo intake:ported
fasst fuel rails
60 or 80# injectors
bg s480 on 20#
th400 rmvb 3600 stall & a brake
carbon driveshaft
8.8 rear with 3.55's, locker, and 31 spline mosier's
275 drag radials

these are my plans im just wondering wat it will be
Last edited by nastylx; Apr 10, 2013 at 11:46 AM.
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Old Apr 9, 2013 | 01:21 PM
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It'll make some power . It'll make probably 600 rwhp or better on high boost.That's about the same combo I have in my Fairmont.
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Old Apr 9, 2013 | 01:23 PM
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You got LS3 heads on a 3.780 bore?
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Old Apr 9, 2013 | 01:26 PM
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You can't use ls3 heads on a 5.3 unless they are the aftermarket small bore ls3 heads.
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Old Apr 9, 2013 | 01:41 PM
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You can't use ls3 heads on a 5.3 unless they are the aftermarket small bore ls3 heads.
Even so, I thought that those still require a 4.000 bore minimum.
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Old Apr 9, 2013 | 02:28 PM
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Well what heads and oil pump should i go with?
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Old Apr 9, 2013 | 02:31 PM
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Im new to ls so i need some serious info
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Old Apr 9, 2013 | 03:24 PM
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YOU can not use ls3 heads on any thing smaller then 6.0.
what fuel? boost level?
If you are pump gas 317 heads, e85 or something to that octane 241,706,243,
stock oil pump with a heavy spring.
mine just put down 621 on a mustang dyno at 19psi
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Old Apr 9, 2013 | 03:35 PM
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What is best heads to run with 5.3 on 20psi and meth
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Old Apr 9, 2013 | 03:57 PM
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I have 243's on my 5.3
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Old Apr 9, 2013 | 05:33 PM
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Originally Posted by redtan
Even so, I thought that those still require a 4.000 bore minimum.
No they don't.

http://www.mastmotorsports.com/2010/...sembled&id=360
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Old Apr 9, 2013 | 07:24 PM
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Damn those are sick, all the benefits of the large rectangular ports and better intake with a 2.080 valve that works on smaller bores with small chambers.

Still wouldn't work on his bore though.
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Old Apr 9, 2013 | 08:17 PM
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706's heads with a valve job and back cut the valves. And boost it and keep it moving.


HR
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Old Apr 10, 2013 | 10:19 AM
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I recently made 550rwhp on 11.5 lbs using a BW S480 on a 5.3 with less stuff than you have. On 20 lbs, i'd imagine you might see 700-750 at the tire
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Old Apr 10, 2013 | 11:44 AM
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Good to hear^
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Old Apr 10, 2013 | 11:47 AM
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I made 587rwhp at 12.5psi with a little mpt 70. Cam and valve spring L33. Went 133mph at 9psi.
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Old Apr 10, 2013 | 11:48 AM
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My goal is 700rwhp, so to hear that gives me some inspiration
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Old Apr 10, 2013 | 11:49 AM
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An it will be in 89 notch
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Old Apr 10, 2013 | 11:51 AM
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I know hotrodtv did similar build and made 540rwhp on only 8psi, so im hoping with a few more mods and 20# i'll see 700 wen its all said an done
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Old Apr 10, 2013 | 12:26 PM
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Should i get 120# injectors?
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