Join Date: Jul 2006
Location: Northfield, Illinois
Having run all the old competition cams, 10121.03.200.01 "Racing 1600 single plug" and 10532.03.200.99 "Racing GTA's only" in both single plug and my GTA engine, I totally agree with Richard's analysis. Neither of these cams provides any low end torque in either engine below 3500 rpm. I completely gave up on the "Racing GTA only" cam when I discovered that even with 11.5 compression and an 80 mm bore my GTA engine only had a very narrow power band, from 4500 (on a good day) to 7500. I switched to the "10 mm" single plug cams, kinder to the big heavy GTA valves, and did not loose much power on a dyno even with a drop in compression to 10.7 and bore reduction to 79 mm. The low end torque appeared at 3500, and the action was over at 72-7400 rpm.
Since, I have listened closely to RJ and had him teach me a little about cam design an what works in these old motors. I now have two (.5) sets of Alfar7, Richard Jemison, designed cams from WebCam, for my Ausca single plug and GTA engines.
I've been doing this a while now, but am not just an old dog. I like new tricks. Listen to his advice. Give him some engine specifics and have him advise you what will work best. He IS the "CAMMASTER" and now has an honorary Engineering Degree as well!
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