An Old Timer once told me...
Mullin, how does it run over say, 4500RPM?
What are the cam specs on the .474?? I never have ran Mopar cams. A quick google search and all I found was the .280 adv dur....
As someone who has ported tons of 302 heads, I'm not going to say the numbers are a fib, but back cutting the valves usually is a couple/few CFM, right? Wild may know more, he has a bench.
I've got the rev limiter set at 6K RPM .... its hard to believe but she is slightly start to lay down on just before I bump the rev limiter. I think all that velocity plays a role into it.
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 2,000-6,000
Intake Duration at 050 inch Lift 238
Exhaust Duration at 050 inch Lift 238
Duration at 050 inch Lift 238 int./238 exh.
Advertised Intake Duration 280
Advertised Exhaust Duration 280
Advertised Duration 280 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.474 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.474 in.
Valve Lift with Factory Rocker Arm Ratio 0.474 int./0.474 exh.
Lobe Separation (degrees) 110
I dont know.. I would have to test them myself or see an outside test result before I would say that.
I have heard people advertise up to 20 cfm with their 'special' valve job, but I dont know...I dont do valve jobs.
They sound like they might be lightly blended, as in just the area below the seat smoothed left over factory throat cut angles.
when I look at stan weiss head flow chart and see 302's flowing into the 190's w/ 160 cc port volumes...I have to scratch my head sum because the stock 302's I HAVE measured 124cc...and flow in the 160-170's, if I remember right. In fact...it took bowl/ssr/roof work to get it to 200 on a factory VJ & valve.
Tomorrow I will put one on and check it to be sure, but remember Im talking stock on a factory pos valve job, they could flow whatever diff depending on the type of valve job/angles done by this or that guy.
BJR did something on the valve job as well not that you mention valves... but gosh I can't remember what.... 4 or 5 angle valve job I think it was??