RB Cam Performing Right?

[lewtot184]

No.
The 231 degrees is the Mopar Performance BS of multiplying the advertised number by 0.85. The 221 degrees is the measured 0.050" duration of the 272 cam.

My 272 measured 223@.050", but seat timing was 277 at .006" in the 440 i ran in my r/ t. I think .85 number is ridiculous and is a marketing scam. I don't think a flat tappet cam can survive a real .85.

 

[gtxrt]

ok 272x.82=223. so his old 484 cam had about 233 duration at .050. 241x.82=233. about one size bigger than the 228 in there now. the big advantage of the 484 was the tight 108 LSA that even Chrysler knew back then to go for a tight LSA. what hurts is its low lift.

 

[dvw]

? I think the cam is:
112 LSA,
108 ICL

You are correct, I misread. I like the 112 much better for manifolds.
Doug

 

[lewtot184]

ok 272x.82=223. so his old 484 cam had about 233 duration at .050. 241x.82=233. about one size bigger than the 228 in there now. the big advantage of the 484 was the tight 108 LSA that even Chrysler knew back then to go for a tight LSA. what hurts is its low lift.

The 284/.484 i measured was 286@.006", 236@.050", 146@.200". I think they're racer brown ssh25 clones.