TW gets my vote. I have a set ported by TEA to a 1262 and they flow 313 at .600 lift. My 9:1 EFI 306 made 308 RWHP through a TKO 500 trans. Weak. but they loved the juice. Sprayed a 200 shot from a NX SysteMaxII plate kit and got 263 RWHP gain for a total of 571 RWHP (678rwtrq)!!!

Now I am building a 347 (using the new BOSS302 block) and can't wait to see how the heads respond to the extra cubes. I personally think that they were to big for a 306 low compression motor... Time will tell.

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On 2006-11-15 19:34, htwheelz67 wrote:
I'm doing a 408 and since I already have T/W heads I am having them ported to 205 by TEA a slight bump over afr,s and better low end.
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[addsig]