olds 350 rocket heads

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December 8th, 2008 | 06:39 PM

dman0712

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Joined: Dec 2008

Posts: 173

olds 350 rocket heads

i have a set of 72 350 rocket heads and i was wondering if anybody new how much bigger i can go with the valves if at all. doesnt look like theres much room. is it even worth it. trying to make 500hp street machine

December 8th, 2008 | 07:06 PM

joe_padavano

Old(s) Fart

Joined: Mar 2007

Posts: 48,401

From: Northern VA

Quote:

Originally Posted by dman0712

The factory installed 2.000/1.625 big block valves in the W-31 heads.

December 8th, 2008 | 07:11 PM

captjim

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Joined: Aug 2007

Posts: 2,250

I went with 2.02" intakes on my 355 with a 4.087 bore. You will need to put a LOT into those heads if you want to see an honest 500 ponies, IMO. N/A anyway.

December 9th, 2008 | 08:13 AM

380 Racer

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Joined: Aug 2008

Posts: 1,130

From: Iowa

Quote:

Originally Posted by captjim

I went with 2.02" intakes on my 355 with a 4.087 bore. You will need to put a LOT into those heads if you want to see an honest 500 ponies, IMO. N/A anyway.

In my #7s I had 2.10 intakes and 1.71 exhaust valves.