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On 2005-02-25 00:57, tonys10sec306 wrote:
Your heads look really good!!. Any flow numbers?
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Folks i've spoken to who have done similiar work on these heads are seeing flow numbers in the 220 and 180 area at .500 to .550 lift for intake and exhaust, respectively. I figure these are right about there and the HP i've obtained is right in line with those flow numbers. I suppose if I we're building an engine any larger than a 331, a set of aftermarkets would be the way to go, but these heads would really do a lot to wake up a 289, 302 or a 331 like mine.
I switched from a 650 VS holley to a 750 VS holley a few weeks ago. I've run into several people who have gone to a larger than normal carb just to pick up 10-15 HP so I thought i'd give it a try. I bought dodgestang's 770 street avenger and had it custom tuned. I put it on and took it to the chassis dyno a few weeks ago, but the secondaries were not opening beyond 50%. I had them manually open them up and torque and HP were significantly above the old chassis dyno curve which was 308 RWHP and 307 RWTQ, especially torque. HP slowly converged back close to the old number of 308 and ended up at 313 RWHP @ 6300. Torque is hard to say because they opened up the secondaries after 3700 rpm where torque peaks, but I feel it could be somewhere in the 320 range based on how much above the old curve it was. Not a huge gain, but I can feel the diference thru the mid range. It's more responsive off the line too. I just had to do it for curiosity sake. I've got a dual plane weiand stealth. Dual planes, from what i've been told, allow for the use of a larger carb without sacrificing low and mid range.
Took it home and pulled the secondary shaft out because it felt like it was binding. One of the teflon bushings was boogered up. Fixed it and now the secondaries turn freely. I'll have to take it back for a final dyno soon.
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Tracy Blackford: Corona, Ca
'65 FB Mustang 331 with H-beam 289 rods, KB 322's, 282S cam, fully preped 351W heads. Built C4 and 3.50 9" posi
<font size=-1>[ This Message was edited by: blkfrd on 3/1/05 1:39pm ]</font>
