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350 upgrade ?

 
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86toy
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Joined: 20 Jan 2010
Posts: 61
Location: tacoma

1986 Pontiac Trans Am

PostPosted: Sun May 02, 2010 9:05 am    Post subject: 350 upgrade ? Reply with quote

Hey guys, im thinking about getting a 350 shortblock for my 86 t/a. i was wondering, how well the 305 heads will work on the 350? motor will be basicaly stock maybe a mild cam.
thanks shad. Razz

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Twilightoptics
Hardcore (12sec Club)


Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Sun May 02, 2010 10:46 am    Post subject: Reply with quote

Need more information on the motor and specific heads. Deck Height, Bore, Chamber size, piston CC etc.
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chevymad
Master B


Joined: 11 Jan 2004
Posts: 5472


1987 Pontiac Formula

PostPosted: Sun May 02, 2010 11:03 am    Post subject: Reply with quote

If you have factory dished pistons it would probably be an ok match. Flat tops you'll probably have too much compression without some work to the heads.
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IROCDave
Member


Joined: 16 Jan 2010
Posts: 957
Location: Snohomish WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Fri May 28, 2010 5:06 pm    Post subject: Reply with quote

I would not install 305 heads on any 350. My wifes car has this settup, it makes good tourqe until 3K then falls on it's face. Spend another 500.00 and pick up a decent set of 350 heads. It will be money well spent.
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Twilightoptics
Hardcore (12sec Club)


Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Fri May 28, 2010 5:26 pm    Post subject: Reply with quote

IROCDave wrote:
I would not install 305 heads on any 350. My wifes car has this settup, it makes good tourqe until 3K then falls on it's face. Spend another 500.00 and pick up a decent set of 350 heads. It will be money well spent.


Really depends on the heads and cam and heads that WERE on there.

Seen lots of 70's low compression smog motors wake up with a 305 head.

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IROCDave
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Joined: 16 Jan 2010
Posts: 957
Location: Snohomish WA

1987 Chevrolet Camaro IROC-Z

PostPosted: Fri May 28, 2010 6:01 pm    Post subject: Reply with quote

The minor bump in compression is not worth the loss of flow that the tiny 305 valves provide. Spend the dough and at a minimum, use a set of L98 cast iron heads. Keep in mind you can pick up a set of superior alluminum after market heads that flow well for 500.00 or less. See my post regarding trading a used set of TrickFlows for a SR. No need to cheap out on a decent set of heads nowadays.
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