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70 longbed · 04-30-2003, 12:30 AM

Super Chevy ran a series about 18 months ago, where they built a 350, then added this part, then that part, and so on; each time they dynoed the engine. Really good article because it was all the stuff that we add; headers, dual exhaust, intake, etc. It was the vortec heads that did the trick. My neighbor is the local Chevy service manager, and also drag races a 350. He says that early model vortecs flow all most as well as the new Corvette heads and some of the more expensive aluminum heads that you buy aftermarket.

I did the something similar to Mudder; 350, .125 pop top hypereutechtics (sp), bored .30 over, airgap intake, edlb 650cfm, and a good size cam, and desk top dyno put me around the 400hp mark. I really don't believe it, and have even decided against the vortec just for the reason of having to modify my intake. Maybe when I get everything put back together and run my regular heads, I can switch out to the vortecs, and have it dynoed again.

In the meantime I have a set of rebuilt vortecs with 1.5 and 1.9 valves, new seals, new (stiffer springs) set up for the 1.6 roller tip rockers I was going to use, for sale; $450 +shipping, or make an offer that I can't refuse.

04-30-2003, 12:30 AM	#5
70 longbed Senior Member Join Date: Oct 2002 Location: Sierra Vista, AZ Posts: 489	Vortec heads Super Chevy ran a series about 18 months ago, where they built a 350, then added this part, then that part, and so on; each time they dynoed the engine. Really good article because it was all the stuff that we add; headers, dual exhaust, intake, etc. It was the vortec heads that did the trick. My neighbor is the local Chevy service manager, and also drag races a 350. He says that early model vortecs flow all most as well as the new Corvette heads and some of the more expensive aluminum heads that you buy aftermarket. I did the something similar to Mudder; 350, .125 pop top hypereutechtics (sp), bored .30 over, airgap intake, edlb 650cfm, and a good size cam, and desk top dyno put me around the 400hp mark. I really don't believe it, and have even decided against the vortec just for the reason of having to modify my intake. Maybe when I get everything put back together and run my regular heads, I can switch out to the vortecs, and have it dynoed again. In the meantime I have a set of rebuilt vortecs with 1.5 and 1.9 valves, new seals, new (stiffer springs) set up for the 1.6 roller tip rockers I was going to use, for sale; $450 +shipping, or make an offer that I can't refuse.