Quote Originally Posted by Roadknee View Post
That's a pretty cool article. I remember when the vortec heads first became popular a 350 with the Hot cam dual plane high rise, good carb and headers would make an easy 410 HP, just like test 4 in the article you linked.

I agree you're building a monster there. I tuned a 406 SB with Etec 170 heads, a Stealthram and a very mild 219/227 at 0.050" hydraulic roller. Based on lb/hr fuel used and 0.50 bsfc it was making 450 HP. I think your changes will bump the power peak 400-500 rpm and add 40-50 flywheel hp over your current combo. Install 1.6 intake rockers if you can. It will make a difference.
One of the first articles I remember on the Vortec heads had to be the one by Hotrod magazine. They literally pulled a junkard 350 from some 70s junker, opened it up, tossed a comp xe268 in it, put 083 tpi heads on it and made 320 hp. They pulled the 083s off and tossed on a set of vortecs. Gained like 55 hp from a head swap. Then they tossed a victor intake and holley on it and came in a touch under 400 hp. It was a dirt cheap~ 400 hp.