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305 VORTEC HEADS ON 350
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77fxe
New User
| Posts: 1
| Joined: 08/03
Posted: 08/10/03
04:33 PM
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HAS ANYONE SEEN ,DONE , HEARD OF OR SEEN AN ARTICLE ABOUT
INSTALLING 305 VORTEC HEADS ON A 350. I WOULD LIKE TO KNOW
IF THEY WORK LIKE INSTALLING 305 CARB HEADS ON 350 DID.
THANKS
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V8Astro
New User
| Posts: 12
| Joined: 08/03
Posted: 08/11/03
05:08 AM
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I'm sure it would work... but as far as I know, not on a LT-1 or LS-1. I would suggest just getting a pair of new Chevy Vortec 350 heads since they are $513.90 per pair complete at Summit Racing. Click below for details.
http://store.summitracing.com/partdetail.asp?part=NAL%2D12558060
1990 Chevy Astro "Family Holler"
1973 350 V8 with TBI
Hedman headers, high-flow cat, dual 3-inch exhaust
1999 Chevy Astro - Family's "normal" transportation
http://v8astro.homestead.com
Tacoma, WA
Edited 8/11/2003 11:33:20 AM ET by V8Astro
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oldBogie
Guru
| Posts: 1195
| Joined: 08/03
Posted: 08/11/03
10:53 AM
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This is an old and reasonably effective trick to inexpensivly run the compression up on a 350 without having to replace pistons or mill the already thin head beyond its safe limits. The 305 has small ports and valves compared to what a 350 would like. This runs the mixture velocity up which makes a real bottom end torque monster out of a 350 but clips the top end at about 5000 revs. More cam helps the revs but drives you into the ususal bad cam habits as duration and lift get bigger.
Not a lot you can do with the valves or ports, just not enough metal to open them up much. But if you want this engine for a stump-pulling jeep it's great.
By the time you spend the money to rebuild these heads your more than half way to a set of Vortecs. Vortecs provide a nice compression bump with excellent chamber turbulance and valve & port sizes more to a 350's likeing. The down side is the need to obtain a Vortec intake, which is more cost.
Bogie
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