upgrading 305TPI to 350TPI need help
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Junior Member
Joined: Jan 2005
Posts: 3
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Car: camaro
Engine: 305ci LB9
Transmission: 700r4
upgrading 305TPI to 350TPI need help
will this motor http://www.gmpartsdepot.com/store/pr...&Category_ID=2
fit into my 1986 iroc-z LB9 305ci? without any major adjustments? does that come with a computer?
fit into my 1986 iroc-z LB9 305ci? without any major adjustments? does that come with a computer?
Supreme Member
Joined: Mar 2002
Posts: 1,176
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From: Springfield, MO
Car: 92 T/A VERT
Engine: LB9
Transmission: AUTO
Axle/Gears: 7.5 / 3.42's
You would need a 350 knock sensor, 22 lb injectors and a 350 memcal. I would look for another option for a long block though, the heads and cam in/on that one leave much to be desired. I believe they offer a L98 short block which would be better, you could also get a set of 083 knock off heads from pro topline for pretty cheap money.
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Joined: Jun 2003
Posts: 3,085
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From: Elgin, IL
Car: 1997 Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73 IRS
I am somewhat amazed they get 290HP out of that motor.
Low lift. Non-roller. 76cc heads.
The camshaft has .450" intake and .460" exhaust lift with hydraulic flat tappets.
The cast iron cylinder heads have 1.94" intake and 1.50" exhaust valves wit 76 cc combustion chamber.
The cast iron cylinder heads have 1.94" intake and 1.50" exhaust valves wit 76 cc combustion chamber.
Supreme Member
Joined: Mar 2002
Posts: 1,176
Likes: 0
From: Springfield, MO
Car: 92 T/A VERT
Engine: LB9
Transmission: AUTO
Axle/Gears: 7.5 / 3.42's
Originally posted by blackroc68
I dont want to correct anyone,But he can use his original knock sensor. He should have a new prom burned for optimum performance. This is a mass airflow system!! same Knock sensor.
I dont want to correct anyone,But he can use his original knock sensor. He should have a new prom burned for optimum performance. This is a mass airflow system!! same Knock sensor.
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From: Dallas, TX area
Car: 91 Formula WS6 (Black, T-Tops)
Engine: 383 MiniRam (529 HP, 519 TQ - DD2K)
Transmission: Built '97 T56, Pro 5.0, CF-DF
Axle/Gears: 4.11 posi Ford 9"
Could be right, in which case I stand corrected. I do know the speed density systems in 91 used different knock sensors for the two. Sorry if I messed you up and you bought an extra knock sensor!
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