I have in my possession this comp grind http://www.compcams.com/Compan...s.aspx?csid=520&sb=2. What would I be leaving on the table performance wise running this cam versus the RM 420-116 284/298 @.050 .475/.450 lobe lift 112* lobe center. My goal is to build a very low maintenance bracket 582, strictly 1/8 mile. Will be garden variety build. So far have dart block, 4.600 bore, 4.375 stroke crank,6.535 long rods, wiseco 14.0:1 pistons, dart 355 cnc heads, set up for .800 lift. Might not be able to swing a set of shaft rockers hence the need to keep cam selection relatively conservative and rpm below 7500. Will be in a 1900 pound 240" 4-link dragster. Let me know if any more info is required. Thanks in advance.
RW
Forgot to add running rons terminator on alky.

This message has been edited. Last edited by: Randy Weber,

Buy the R-M cam. You be happy with it. Sell the other one.

Yup, 284/298
The 110 works better with smaller ci. Dont be afraid of stud rockers, use a good girdle, some doubles either Manley 221424 or PAC equiv.
Make sure the geometery is good.
All I ever ran was crane stud mnt, 1.8 on intake 1.7 exh with a net of .820 with a .476 lobe. = lift -lash and deflection
Never any valvetrain realated issues, con rods, well that is another story.
Be sure on compression.

I ran this cam in my 540 Dart 355, rockers and stud girdle, never had a issue work great in dragsters. 4 link Undercover, 4.83 @142 on c12,

On alky definitely the RM cam over the other and it isn't the ideal cam for that fuel.

Thanks to those who responded. Any cam and compression recommendations welcome.

I would definitely call Bullet and see what they recommend. Those are some of the sharpest guys in the business and can tell you which one of those cams will work better and why or may recommend something else.

No matter what brand you buy or where you buy it from talking to someone who really knows can only help you make a better decision.

quote:

Originally posted by SCDIV1:
Buy the R-M cam. You be happy with it. Sell the other one.

THIS!!!! I have been running the RM 116 with my Rons alky injected 565 for 6 years and couldn't be any happier. Pac 1224 springs 275 on the seat at 2", HS roller rockers with RM girdle. Springs just go and go and go. Install it at 110-111 ICL and forget it.

If you want to step up to the 117 cam I have a friend that has one with 7 runs on it that he want like $300 for

quote:

Originally posted by Randy Weber:
Thanks to those who responded. Any cam and compression recommendations welcome.

. Most likely your going to want something in the low 280 intake low 290 exhaust duration ground on a 115 LSA for alky and the RPM your specing. That's my thoughts not knowing your engine/ combo better.

My 582 cam is 285/304 @ .050 on a 114. Put in at 110.

quote:

Originally posted by Big Steve:

quote:

Originally posted by SCDIV1:
Buy the R-M cam. You be happy with it. Sell the other one.

THIS!!!! I have been running the RM 116 with my Rons alky injected 565 for 6 years and couldn't be any happier. Pac 1224 springs 275 on the seat at 2", HS roller rockers with RM girdle. Springs just go and go and go. Install it at 110-111 ICL and forget it.

If you want to step up to the 117 cam I have a friend that has one with 7 runs on it that he want like $300 for

288 intake lobe is gonna like higher compression. Mid 15.

Here is mine in my 582 with 14.9 compression:

810/782 286/300 lobe is .476/.460 lobe is 112 and CL is 110 i use a 1.7 rocker
valve opening Intake is 33, Ex 84 closing intake is 73 and ex is 36.

runs 4.70 at 2055 and 4.62 at 1950 with a convertor that goes 6550 and a ken jones 1150 on alky. BB3Xtra heads.

quote:

Originally posted by The Bozman:
Here is mine in my 582 with 14.9 compression:

810/782 286/300 lobe is .476/.460 lobe is 112 and CL is 110 i use a 1.7 rocker
valve opening Intake is 33, Ex 84 closing intake is 73 and ex is 36.

runs 4.70 at 2055 and 4.62 at 1950 with a convertor that goes 6550 and a ken jones 1150 on alky. BB3Xtra heads.

How would this cam work with gas instead of alky? Would a shorter duration be better for gas?

quote:

Originally posted by JP Miller:
My 582 cam is 285/304 @ .050 on a 114. Put in at 110.

I went back and checked and the duration @ .050 is 286 intake and 304 exhaust. Lobe lift is .492/.493

quote:

Originally posted by NC3x58:

quote:

Originally posted by The Bozman:
Here is mine in my 582 with 14.9 compression:

810/782 286/300 lobe is .476/.460 lobe is 112 and CL is 110 i use a 1.7 rocker
valve opening Intake is 33, Ex 84 closing intake is 73 and ex is 36.

runs 4.70 at 2055 and 4.62 at 1950 with a convertor that goes 6550 and a ken jones 1150 on alky. BB3Xtra heads.

How would this cam work with gas instead of alky? Would a shorter duration be better for gas?

It would be fine on gas in my opinion, since you are in Ohio you will most likley run better in the cooler air, being in Texas the alky really helps on the 100+ days

CB 1719B/1760B on 115 lsa
1.8/1.7
Stand rockers with this is a mistake

Here is my cam specs of the SDPC 582 Head Hunter engine that Alan Bracy built for me.
Int 867 Exh 833 281 @.050 301 ground on a 113 lobe using a 1.75 rocker on Alky. It also uses a +.400 rod using Diamond pistons 15.2 compression.

IHRA ACDELCO Canadian Nationals
Top/et Iron man Champion
Don Davis 57 Corvette Super Gas roadster
SDPC 582 Head Hunter

quote:

Originally posted by NC3x58:

quote:

Originally posted by The Bozman:
Here is mine in my 582 with 14.9 compression:

810/782 286/300 lobe is .476/.460 lobe is 112 and CL is 110 i use a 1.7 rocker
valve opening Intake is 33, Ex 84 closing intake is 73 and ex is 36.

runs 4.70 at 2055 and 4.62 at 1950 with a convertor that goes 6550 and a ken jones 1150 on alky. BB3Xtra heads.

How would this cam work with gas instead of alky? Would a shorter duration be better for gas?

The difference between gas and alky is in the overlap. Alcohol needs a cam that retains the heat of combustion more. If not, your just blowing power out the exhaust. That's the short answer.

You need accurate engine info,14.0 piston doesnot guarantee that CR will be 14.0.That said would not be more than 282 intake .050 duration and possibly less if CR comes in at 12-13 something to 1 .Bill C.

Good info folks and will take it all in to consideration. Thanks again to all who responded.
RW