I wanted to put the specs here so I will always have them (I've lost the specs on previous ones :16suspect ). Competition Cams Rebel Series RB36HR10+3* Valve Adjustment: Intake: .000" Exhaust .000" Lobe Lift: Intake: .378" Exhaust .375" Gross Valve Lift 1.60 Ratio: Intake: .605" Exhaust .600" Duration @ .050" Tappet Lift Intake: .228* Exhaust 234* Lobe Seperation: 110* Recommended Intake Centerline: 107* Specs at 107 Degree Intake Centerline: Valve Timing at Open Close .050" Tappet Lift Intake: 7* BTDC 42* ABDC . Exhaust: 50* BBDC 4* ATDC Specs at 109 Degree Intake Centerline: Valve Timing at Open Close .050" Tappet Lift Intake: 5* BTDC 43* ABDC . Exhaust: 48* BBDC 6* ATDC "The power band is roughly between 2500 to 6300 rpm for 331-349 cubic inches The power band is roughly between 2800 to 6600 rpm for 302-311 cubic inches The preferred spring pressure is 140#-145# on the seat. Titanium retainers and lightweight valvetrain recommended. Hardened Push Rods are required for best performance. Highly recommended to use high-pressure oil pump. It is highly recommended to use the best flowing cylinder head possible. It is highly recommended to verify piston to valve clearance. Failure to do so may result in serious engine damage." The package came with new springs and seats. EDIT: I just noticed these specs are different from the one he told me he was sending. Which was: Rebel Series - RB36HR10+2 Valve Adjustment: .000” .000” Lobe Lift: .378” .375” Gross Valve Lift 1.60 Ratio: .605” .600” Duration @ .050” Tappet Lift: 228* 234* Lobe Separation: 110* Recommended Intake Centerline: 108* Specs at 108 Degree Intake Centerline: Valve Timing at Open Close .050” Tappet Lift: Intake: 6* BTDC 42* ABDC Exhaust: 49* BBDC 5* ATDC Specs at 106 Degree Intake Centerline: Valve Timing at Open Close .050” Tappet Lift: Intake: 8* BTDC 40* ABDC Exhaust: 51* BBDC 3* ATDC I just sent an email to Ed Curtis.
Ti retainers are overkill for those spring pressures and rpm range. While it does not hurt to use them, they certainly are not a must.
Yeah, I "opted out" on the ($300) Titanium retainers after talking with a few podnas. I just don't like the fact that I was given the specs that he was going to order then I receive a different grind. This is after a 3-week delay because the first cam that arrived from Comp Cam was "not to his specs". Hmmmmm.....
Unless I overlooked something, the only difference I noticed was that the cam you received was ground with 1 less degree of lead (advance) than you were told. That won't make a difference in performance. I guess Comp must have really screwed up the first order.
I hope you're right, as long as being "just 1 degree off" isn't the same thing as your girlfriend being just "a little bit pregnant". I'm sure there are tolerances they grind to, but in my industry, we hold plus or minus a 1/4 of a degree on much less intricate parts. Also, why would they measure specs at 107 and 109 on one cam and 108 and 106 on another? ('honest question - trying to learn a little more about the complicated cam) I dunno. I'll see what his reply is.
I am pretty sure they are not the same. As I am sure you know by now, there is a lot of "sloppiness" in the automotive performance aftermarket. Very seldom does something ever fit properly right out of the box. Good question. What you were originally told you were getting was a cam that had 3 degrees of advance built into it. The 107 c/l measurements are what you should see on the degree wheel when you install the cam "straight up" (no advance/no retard). The 109 degree measurements are what you should see on the degree wheel if you install the cam 2 degrees retarded. What you are being told now is the cam has 2 degrees of advance built into it. The 108 measurements are what you should see on the degree wheel when the cam is installed "straight up". The 106 measurements are what you should see on the degree wheel if you advance the cam 2 degrees.
Thanks for the info, Fred. As you can tell, a cam guru I'm not, but am interested in learning something new every day. It helps keep keep the mind mind shapr.
