340 cam

Sorry Joe I first overlooked you mentioning the machining for dual springs. Just noticed it. Didn't mean to be repetitive.

No problem at all. :)

mygwenevere66, he said he was pulling 6" at idle in his first post. :)

Green1, it sounds as though that cam has a ton of duration. Have you tried cracking the secondaries open a touch with the set screw under the carb? Also, even though it was installed straight up, some older cams show up retarded when degreeing the cam.