Camshaft question! Has anyone out there used a Comp Cams Magnum Series 280h in a big block chevy. I'm building a 454 for my 67 camaro and plan to use one. It will have headers, about 9.3:1 comp ratio, Edelbrock performer, and a 4 speed. Mostly for street cruising. Let me know what you think. Thanks!
Yep, had one in a 2-bolt main 454 (.030" over, so actually 461) a few years back. The engine had TRW pistons (I forget the part #), but the advertised static compression was about 10.5:1. The engine used stock "049" oval port iron heads, with headers, hi-rise and 780 Holley.......
Mild choppy idle, no lugging while taking off. Easy to drive. Peaked out at about 5600 rpms. My car is 68 with 3:73 posi and Muncie 4-speed.
IMO your compression is a tad low.
Good luck with the build. Please post results................
Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
i run one in my 468 right now. 10.5:1, 781 heads, holly 750, ect. overall i like the cam pulls good ,runs out at about 5800 nice old school cam. i agree your compression might be border line, not sure what is recommended for that cam i think it was 10:1
One of my favorite cams for a BB. Agree with the boys above. I've run it in no less than three cars. In a 454, she'll come in about 2000 rpm and pull hard to 5500. For the street, it's perfect for a flat-tap. It will also provide enough vacuum for your brakes.
You'd need at least a 3.55 rear (I'm guessing your 4-speed is a wide ratio). A 3:73 would be perfect.
Also agree, this cam would like around 10:1 cr or 10.5 with aluminum heads.