Quote:
Originally Posted by CHRIS DAMSCH
Ed,
Call Dennis at Olthoff Racing (spf Dealer) and ask him about the larger 351 headers. When I talked to him, he said there isn't a large difference in power (about 10hp at 5500rpm, but loss of tq down low). He was the one making the headers.
Dennis is very pleasant to talk too and very informative with these types of questions.
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Thanks for the info... I talked to Dennis a month or so ago about the possibility of switching my Roush/Dart 195 heads to the AFR 185 Comp’s or 205's and adding the larger port headers to compensate for the AFR ports and his advice was to run what I have because the increase in hp/tq wasn't worth it. It’s his opinion, in my particular case, the expense and efforts simply aren't worth the gains. The dollars per horse power are in the $35/hp range. I believe Dennis has just a little more experience with these cars and performance motors than I do. My experience is limited to one Cobra, 6000 miles and zero track experience.
In short I have done nothing but enjoy my machine. As mention earlier I do plan to have the car dyno'ed to confirm the air/fuel ratio over the rpm range. The side benefit will confirm the drive train losses based on the engine dyno number from Roush.
I’m still following the head swap articles with great interest.
Thanks again,
Ed