holley 670 tbi
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: holley 670 tbi
Originally posted by taylor91rs
What kind of horsepower gains will my 305 get by puting ona holley 670 tbi.
What kind of horsepower gains will my 305 get by puting ona holley 670 tbi.
https://www.thirdgen.org/techbb2/sho...hreadid=205713
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Car: 1994 25th Anniversary Trans Am
Engine: Lt1
Transmission: A4
Would one benefit from the holley TBI on an otherwise stock 350? Because right now I feel that the stock TBI and manifold are really holding my motor back. The car really has now upper RPM power. I know it's not a powerhouse but I'm hoping the Holley and a better manifold well help out somewhat. What does everyone think?
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Car: 89 Camaro RS
Engine: 305 TBI
Transmission: 700R4
Maybe, but I would definately try the ultimate tbi mods in the tech section first. They are free, and do help out. I just now got a 670 because I believe it's the last bottle neck on my motor besides alittle more tuning. If you want to get alittle crazy go ahead and buy a carb intake with a tbi adapter plate, then later on you can add a 670. I would say headers, cam, intake, and ultimate tbi mods should all be done first. Although a mild 350 may run descent and gain alittle with a 670, it's up to you.
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Car: '90 RS
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Transmission: Magnum T56
Originally posted by cas0484
Would one benefit from the holley TBI on an otherwise stock 350? Because right now I feel that the stock TBI and manifold are really holding my motor back. The car really has now upper RPM power. I know it's not a powerhouse but I'm hoping the Holley and a better manifold well help out somewhat. What does everyone think?
Would one benefit from the holley TBI on an otherwise stock 350? Because right now I feel that the stock TBI and manifold are really holding my motor back. The car really has now upper RPM power. I know it's not a powerhouse but I'm hoping the Holley and a better manifold well help out somewhat. What does everyone think?
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Car: 89 Camaro RS
Engine: 350 carbed now
Transmission: World Class T5
Axle/Gears: Peg Leg w/ 3.73's
cas0484 I would definetly reccomend going with a better manifold, the stock tbi manifold sucks. Just before I pulled my motor out this winter I put a performer RPM intake on and I felt a pretty good improvement in power I would say it probably knocked a few tenths off my quarter,but I didnt get any times before I pulled the motor so I dont know for sure. As for the holley 670, it really improved the ET's on my car but like I tell everyone I dont know if the guy I bought my Lo5 from did any headwork or changed the cam before he sold me the motor so I dont know if they are stock. Your biggest limitations are your heads and cam on that motor. you could try installing 1.6 roller rockers to raise the lift on your cam a little. You will see a decent gain from that. Also I saw that you ran a 15.0 @ 97 mph , with that trap speed you should easily be in the mid 14's, so your engine is probably doing as well as mine was when I got the times in my sig, I had about the same setup you have now. Good Luck.
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