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305 to 350 TPI swap, some questions about heads and cam

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Old Feb 28, 2012 | 03:47 PM
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305 to 350 TPI swap, some questions about heads and cam

ok so i have an 85 z28 305 TPI that just blew up, blew the crank outa it and sumhow took part of the cam with it slinging it outa the side of the block

ANYWAY top end still seems good, ill know more when i pull the heads off

so im building a mild 350 but wana use the TPI setup from the 305 on it

WILL these heads and cam work with the tpi on the 350?

i have a set of world product torquer steel heads cast S/R I-052

and a wolverine cam 280/290 duration and 480/490 lift

i know ill prob need a different ecm and a custom chip but at the moment im worried if the cam will be to much for TPI or the heads wont bolt up to the tpi LIM
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Old Feb 28, 2012 | 04:07 PM
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Re: 305 to 350 TPI swap, some questions about heads and cam

also the 350 im using is a 2 bolt main outa a 1992 G20 van, its only a temp botom end while i look for a 0010 block 4 bolt main, i just need her running so the 2 bolt should be fine, im only guestimating under 350hp and 400trq
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Old Feb 28, 2012 | 04:07 PM
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Re: 305 to 350 TPI swap, some questions about heads and cam

will the G20 oil pan work in the camaro?
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Old Feb 28, 2012 | 04:19 PM
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From: Batesville, AR
Car: 1990 Formula Firebird
Engine: 350 (5.7) TPI
Transmission: WC T5
Axle/Gears: 3.42 POSI
Re: 305 to 350 TPI swap, some questions about heads and cam

I'm doing the same thing. 1992 G20 350 in my 'Bird.
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Old Feb 29, 2012 | 11:28 AM
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Re: 305 to 350 TPI swap, some questions about heads and cam

did teh G20 oil pan work in the bird? or will it hit the frame or something?

also im gona b running big heads and a very big cam and port work, do u think the 2 bolt main will b strong enough or should i buy a new 4 bolt?
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Old Feb 29, 2012 | 06:19 PM
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From: Batesville, AR
Car: 1990 Formula Firebird
Engine: 350 (5.7) TPI
Transmission: WC T5
Axle/Gears: 3.42 POSI
Re: 305 to 350 TPI swap, some questions about heads and cam

2 Bolts can handle power just fine.

Have not dropped the G20 350 in yet but I think the pan fits.
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Old Mar 1, 2012 | 04:16 PM
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Re: 305 to 350 TPI swap, some questions about heads and cam

ok cool, we are estimating roughly 370hp at the crank with this motor, im starting a project thread now
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Old Mar 1, 2012 | 06:38 PM
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Andrew James's Avatar
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From: Batesville, AR
Car: 1990 Formula Firebird
Engine: 350 (5.7) TPI
Transmission: WC T5
Axle/Gears: 3.42 POSI
Re: 305 to 350 TPI swap, some questions about heads and cam

When you are making over 500+ horsepower you can start worrying. Link to project thread?
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Old Mar 18, 2012 | 12:30 PM
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Re: 305 to 350 TPI swap, some questions about heads and cam

heres the project thread
https://www.thirdgen.org/forums/memb...ct-85-z28.html
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