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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 09-04-2009, 12:44 PM   #1
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Join Date: Aug 2007
Location: Milwaukee, Wisconsin
Posts: 1,525
Car: 1987 IROC-Z
Engine: 305TPI
Transmission: 700r4
Axle/Gears: 3.42

Classifieds Rating: (5)
TPI on an old block?

If you look to the left, you will see I still have the baby 305... I mentioned to a friend that I was considering a cam swap, he said he probably has a 350 block laying around that I can have for free. My only concern is that I won't be able to use the stock TPI setup. Would all the bolts line up? Would all the plugs on the wiring harness have a spot to plug into? Is there anything else that may make it difficult to do the swap? I really don't want to switch to a carb setup. Is this even possible?

Thanks,
Mike
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Old 09-04-2009, 01:20 PM   #2
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Re: TPI on an old block?

its possible.................. but for the work and money you would get better results with a set of headers,a cam and a custom chip.thats if your motor is good.
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Old 09-04-2009, 02:13 PM   #3
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Join Date: Aug 2007
Location: Milwaukee, Wisconsin
Posts: 1,525
Car: 1987 IROC-Z
Engine: 305TPI
Transmission: 700r4
Axle/Gears: 3.42

Classifieds Rating: (5)
Re: TPI on an old block?

Free is a good price... especially on a usable 350 motor. So with that said, what kind of work are we talking about here? Are the bolts just at a different agnle or something, or would a lot of things not match up? The biggest thing I'm concerned about is if and how all the electronics will hook up.

If I get this motor, I plan on doing a 383/396 upgrade right away.
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Old 09-04-2009, 05:05 PM   #4
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Re: TPI on an old block?

the bolt angle your talking about has to do with the heads you use.that can be fixed,other than that they are the same 305-350.there are two different styles for each motor they went piece rear main and different dipstick after 87.the heads all interchange.87 up has a different intake bolt angle in the center.there are workarounds for that. but tpi will work on it no problem.

a 383 is gonna run you some cash and depending on how its built the tpi will become a restriction and you'll have to upgrade the tpi intake,throttlebody,runners,and run you some serious money

Last edited by regal301; 09-04-2009 at 05:09 PM.
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Old 09-04-2009, 05:05 PM
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