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Jeff Chambers · 11-18-2002, 07:46 AM

Two things I'm not quite understanding:

1) 1.60:1 rockers increase the lift? That would mean that the intended rockers are about 1.51:1? Just making sure here.

2) Also say that you want to drop to 3.55's to get the RPM's higher? That will have the exact opposite effect. Going to 3.55's from 3.73's will drop the rpm about 6.1% at the same MPH. I'd go up to a 4.30 gear or even better yet a 4.56 gear for the carbureted combination.

You don't say where he's making power or shifting things now, but just looking at the cam specs, I'd say that he needs to look at a different cam. What's the lobe CL on the cam? I've been shifting my Weiand Stealth / Holley 650 combination at as much as 7400rpm so his carb and intake should breath that high as well even though he's moving more air than my 306ci motor.

11-18-2002, 07:46 AM	#3
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Two things I'm not quite understanding: 1) 1.60:1 rockers increase the lift? That would mean that the intended rockers are about 1.51:1? Just making sure here. 2) Also say that you want to drop to 3.55's to get the RPM's higher? That will have the exact opposite effect. Going to 3.55's from 3.73's will drop the rpm about 6.1% at the same MPH. I'd go up to a 4.30 gear or even better yet a 4.56 gear for the carbureted combination. You don't say where he's making power or shifting things now, but just looking at the cam specs, I'd say that he needs to look at a different cam. What's the lobe CL on the cam? I've been shifting my Weiand Stealth / Holley 650 combination at as much as 7400rpm so his carb and intake should breath that high as well even though he's moving more air than my 306ci motor. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"