Cam Selection

[Dejavu1]

By way of introduction, and to make ya'll aware of where I'm coming from.... I'm Mike and live in South Western NC. I'm into this motor (4406bbl) due to worn cam lobes, and metallic fragments showing up in various places in the bottom end. I had used a Mr. Sixpack cam back then, and it served me well. I think modern oils and infrequent driving had a lot to do with the problem. I thought while I was in there, I would make it a little more fun for the family, cruises, shows, farting around town, etc. My builder recommended this Comp Retrofit Roller Cam. I initially restored this 28,000 mile completely matching numbers Rallye Green A12 back in 1999-2000. I owned a body shop back then and restored it 100% correctly and won all the original type shows in which I entered it (AACA Senior First Place. etc.). I originally had seen it in a magazine add and bought it from a gentleman in Greeley Colorado (smoking, but running). He name was Greg Button. As it sits today, it has 33,000 miles on the odometer. I'm 70 years old and am looking to have a little fun with it before I can't. It will eventually be an heirloom for my two sons. I'm not disturbing anything that can't be easily put back and/or corrected. This is the second A12 I've owned. I bought the first Vitamin C car in 75 with 15,000 on it, off the lot of Tedder Motor Company (Dodge, Plymouth Chrysler, Jeep Dealership in Shelby NC). The former owner had been drafted (Vietnam) and he left the "no power steering beast" for his mother to drive. She couldn't wheel it and eventually traded it in at the dealership. I paid $2,250.00 for that one and drove it all through high school and the dating scene, and after getting married in 79 (with changing priorities) I sold it in the mid-80 for $8500.00, and was sick for years (until the green car came along) So.... in short, that is where I'm coming from (a little history) and what I'm looking to accomplish. Thanks for any advice or info about this cam selection.

Comp Cams Thumpr Retrofit Hydraulic Roller 23-600-9:
Advertised Duration 283/303
Lift .513/.498
Operating Range 1900-5600
Lobe Separation 107

Other Relevant Specs:
2200 Stall Converter
4:10 Rear
Headers
Original 1969 906 Heads
3x2 Barrels

 

[496 polara]

Probably wouldn't be my first choice. Don't think you really need the tight lobe separation and the 20 extra degrees of exhaust duration. Probably idle quite menacingly though.

I would reach out to Dwayne Porter @PRHeads and have him spec something for you. He spec'd my first hyd roller in my 505 with the comp evolution lifters that did well for me on the Dyno. Still working on other areas of the car.

Beautiful car and kudos to you!

 

[Dejavu1]

Probably wouldn't be my first choice. Don't think you really need the tight lobe separation and the 20 extra degrees of exhaust duration. Probably idle quite menacingly though.

I would reach out to Dwayne Porter @PRHeads and have him spec something for you. He spec'd my first hyd roller in my 505 with the comp evolution lifters that did well for me on the Dyno. Still working on other areas of the car.

Beautiful car and kudos to you!

Thank you brother

 

[F6A12]

Bob K Six Pack cam in my car.
12.74@108 mph at the Pure Stock drag Races last year.

 

[BSB67]

Bob K Six Pack cam in my car.
12.74@108 mph at the Pure Stock drag Races last year.

I think that is what he is replacing

 

[451Mopar]

Sounds like you want to go with a hydraulic roller cam?
I only have one car with a retrofit hydraulic roller, and it's OK, but valve train sounds noisy like a sewing machine? Not sure if it is the cam, lifters, roller rocker arms, or roller cam button, or a combination of it all?
I think if I did another, I would use a nylon type thrust button and the extra thick 440 source timing chain cover. I think the roller thrust button touching the stock timing chain cover is making some of the noise?
It could be my 20W-50 oil too? I hear the hydraulic roller lifters need a lighter 30 weight oil?
Will need shorter pushrods. I would get an adjustable checking pushrod and custom order pushrods of the correct length.
On the other hand, some of the noise might be from the individual port electronic fuel injectors?

 

[F6A12]

Engine Masters did the hemi vs 440 six pack dyno shoot out and they gave a part number for a Schneider cam that is designed to work with the six pack. I think it was a hydraulic roller.