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73-87 Chevy _ GMC Trucks => Performance => Topic started by: BULLDOG on July 01, 2011, 06:18:41 pm

Title: Goodwrench 350 head and cam swap
Post by: BULLDOG on July 01, 2011, 06:18:41 pm

I am working on a 1983 k20 with a sm465 and goodwrench crate engine.
Where doing a head and cam swap lets see what you all think about the combo .
GM goodwrench 350 a set of ZZ4 heads .028 head gasket for a 9.8ish to 1 CR Holley 770 the ZZ4 intake with some 1 5/8 D port headers and this cam voodoo 60101
 
http://www.summitracing.com/parts/LUN-60101

Title: Re: Goodwrench 350 head and cam swap
Post by: 1980c10 on July 01, 2011, 09:40:06 pm

Sounds like a great combo. Maybe consider a 670 with bigger jets as it will help keep your vacuum up a little and should be able to keep up just fine.

Title: Re: Goodwrench 350 head and cam swap
Post by: ohio hab on July 02, 2011, 06:41:13 am

What number rear gear, sound's like a good combo. I would use a smaller carb if mainly street driven, like an 600 or 650 cfm max.

Title: Re: Goodwrench 350 head and cam swap
Post by: BULLDOG on July 02, 2011, 08:15:53 am

This is kind of a whats laying around build I have the 770 setting on a shelf it ran really strong on the zz4 .
The rear axil has 308 on it I am not really sure whats realy in there.

Title: Re: Goodwrench 350 head and cam swap
Post by: 1980c10 on July 05, 2011, 01:40:45 am

The 770 will work and being that you already have it I would use it. It's just a little bigger than it has to be. I had run a 770 on my similar engine and it ran great but went with the 670 as it was able to run just as well with bigger jets installed. IMO I don't see running a smaller cfm(600cfm) carb on a 350+hp engine and keeping up with the rest of the engines capabilities.