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Good score for a 305 TPI upgrade???

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Old Nov 23, 2009 | 11:37 PM
  #1  
turbojohn's Avatar
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Car: 86 Trans AM
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: ???
Good score for a 305 TPI upgrade???

My buddy gave me a 350 engine pulled from a 88 Blazer for free! My question is will I be able to make this work in my 86 T/A that currently has a 305 TPI? I want to step up the cubes and keep the TPI if possible. Will I need anything else?? If I can get this running, the next thing is a homemade rearmount turbo!!!!! HELP????

Last edited by turbojohn; Nov 23, 2009 at 11:40 PM. Reason: oops
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Old Nov 24, 2009 | 12:07 AM
  #2  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Other than the Blazer engine having '87-up heads with the different intake mount bolt pattern, not a problem.

You could probably find someone who would be willing to trade their '87-up TPI base for your '86-earlier TPI base. Or, upgrade to an Edlebrock '87-up base. Or, modify the mount bolt holes in your '86 305 base.

350 knock sensor & module (which the Blazer should have) and 22 lb injectors would be good things to have. Use your 305 flexplate and starter.
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Old Nov 25, 2009 | 10:20 PM
  #3  
turbojohn's Avatar
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Joined: Jan 2007
Posts: 14
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Car: 86 Trans AM
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: ???
Re: Good score for a 305 TPI upgrade???

So the 88 block is a good foundation? I have been nervous about the differences in rear seal, etc. I realize I am in the funk of transitions, etc. I am just looking for a good start for a 350 build. THANKS!!!!!!!!
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Old Nov 25, 2009 | 11:25 PM
  #4  
five7kid's Avatar
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
'86 was the first year of the one-piece rear main seal, so if your car has an '86 or later engine, it would be one-piece.

It isn't that big of a deal, though. I do like/prefer the one-piece design.
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