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Rebuilding Lb9 To 300 Hp

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Old Mar 19, 2003 | 04:38 PM
  #1  
IROCME's Avatar
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Joined: May 2001
Posts: 509
Likes: 1
From: N/a
Car: 1986 IROCZ
Engine: LB9....rebuilding coming soon
Transmission: rebuilt 700R4
Rebuilding Lb9 To 300 Hp

What are cheap and proven parts combo to acheive this Im trying to keep the engine rebuild under 1500
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Old Mar 19, 2003 | 04:52 PM
  #2  
nikh23's Avatar
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Joined: Aug 2001
Posts: 1,228
Likes: 1
From: Caldwell, NJ
Car: 88 IROC Convertible
Engine: 305 TPI
Transmission: Raptor 700
try PMing Sitting Bull, i know he's got his 305 running around the 300 hp range. Also search for a huge article by Sitting Bull a while back which showed you how to port and polish your 305 heads to make them flow i think something like 90% of what vortec heads would flow which is damn good in my opinion. Anyways good luck to you
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Old Mar 19, 2003 | 05:17 PM
  #3  
Ed Maher's Avatar
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Joined: Sep 1999
Posts: 3,197
Likes: 10
From: Manassas VA
Car: 04 GTO
Engine: LS1
Transmission: M12 T56
Sitting bull is full of ****. He's never even been near a track let alone a dyno, his 300hp estimate is pie in the sky dreaming. Hell, along with his 300hp estimate he'll also proudly proclaim that the same simulators say he'd run mid 14s. So i guess my stock LB9 is making 350hp then.

If you want to make 300hp for under $1500, go straight to a 350 and don't look back. Any basic 350 with a mild cam can easily make 300hp. True 300hp 305s are not that common for a reason. At the least it'd have to be a well matched combo and be near perfectly tuned.
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Old Mar 22, 2003 | 02:01 PM
  #4  
mikobu3's Avatar
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Joined: Feb 2003
Posts: 234
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listen to ed on this
i'm sure if you ported you lb9 heads with a 1.94 valve job, and put a comp 212-218 cam, then do the chip you should atlleast be 280 hp , now i no for the stock exhaust systems on my 86 305 tpi ,it has the 3 inch stock, with the 3.42 gears,
i'm telling you here 1500 dollars won't be enough to run in the 14;s with peanut cammed 305 ,thats my opinion
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Old Mar 23, 2003 | 03:02 PM
  #5  
Scarebird's Avatar
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Joined: Jul 1999
Posts: 77
Likes: 0
From: ABQ, NM, USA
Car: 1998 Z28 convertible
Engine: LS1
Transmission: 700-R4
Axle/Gears: 3.23
1983 Berlinetta with 1985 305 TPI, stock cam & chip, headers, hi flow cat, 700-r4, 3.08 pegleg, 225/60/14 Goodyear GT+4's

14.997 @ 94 mph Mid 60's with high humidity at 600'
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Old Mar 23, 2003 | 10:32 PM
  #6  
IROCZ88x's Avatar
Senior Member
 
Joined: Jul 2002
Posts: 519
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From: marlborough/dartmouth, MA
Car: 1988 IROC-Z
Engine: LB9
Transmission: 700R4
id dont think its possible to get 300hp from a LB9 for less than 1500...if im wrong, id love to see how its done...could cost twice that
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