TR told me the same thing, they work OK with 10.8:1 compression but really like 11.1:1, that's what compression i'm running and I am swapping out these crappy 259e's for the 662-2's.

 

Draggo...your last post said "PM SENT" I did not receive a PM from you!!

Anyway...Hmmm now I'm kind of debating the 662-2.. Dont get me wrong, I want the torque down low, but if I would only lose 2-5 ft/lbs before 2500rpm, and gain 8-12 ft/lbs above 2500rpm, the 662-2 sounds even more appealing. Now i'm really in a dilema!!

About the compression. Does anyone think I will lose a SUBSTANTIAL amount of power by running either of these cams at 10.5:1 rather thatn 10.8 or 11:1?? I really dont mind bumping it up to 10.8 as my motor that i'm switcing over to the dyna runs at 10.8 without a problem. 11:1 may be a little much for me. Dont want to have to worry about it that much. My only reason for running the motor at 10.5 is because for one, it comes out of the crate that way, and number two, I figured since I had the 107" at 10.8, this time around, let me try a bigger displacement running a little less comp. But if running a little less comp is gonna really drag the performance down substantially, then I will bump it,

Can anyone do the math for me as far as the headgasket I would have to run to bump the comp on the 120r to somewhere between 10.5:1 and 10.9:1? I still do not understand the whole computation method (always sucked at anything more than basic math..lol) I will run either the 662-1 or 662-2 cam. If you need anymore info, just let me know Thanks guys

 

Tman has some dyno sheet on his site, you can search by cam. Pretty sure he has some 662's with 10.5: compression. My reasoning for going the 662-2 route is simple, the 662-1 makes more torque between 1000 and 2000 RPM, (not much, but some). I don't know about you, but I don't spend much time under 2000 RPM's, especially in a drag race. At cruising with stock gearing 55 MPH is about 2300 RPM's, so rolling on the throttle with the 662-2's should pull harder longer than the 662-1's. We have also noticed that the 662-1's are a little noisier cam. Hope this helps.

 

It was the pm sent back and forth. Give me a call if you have any questions.
And I sent you a price on the tman cams662-1 and 2 same price.

 

And that what we see here also with 662-1 and 2
My 2 cents says the 662-2 you will like more..

 

Yep. I've tuned a number of each on it's pretty common. I'd rather give up 2 or 3 torque between 1 and 2K rpm's for the huge gains at 2K and above. I can't wait to get them in, the only reason I put the 259E in is because it was replacing the 251, and we've had pretty good sucess with the 251 for a SE cam, I wanted to try the 259E out in my bike before we put is in customers, glad I did, because i'm not real impressed with it. I think i'll gain with the 662-2

 

i have run both...there is no HUGE gain above 2500 one over the other....the tman series cams that you mention pull longer in the rpm range. The 408-6 is an absolute tire shredder cam.