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Discussion Starter #1
Just looking for some input for the cam timing on my cleveland. I am going to use this cam with aussie 2v's a weind xcellerator manifold and I have a holley 650cfm carb:

Int./Exh: Adv. Dur. 278°/290° , Dur. @ .050” 222°/234°. Lift: .539”/ .534

Float is at 6500 rpm
power from 2200-5200 rpm

If I retard the timing that will shift my powerband up right? Will it also shift the float rpm up?

I'd like make some useable power at the high end, near 6000, but will shifting the powerband up defeat the purpose of the 2V CC heads and would it just be better to run advanced and get it all in sooner? the timing chain set I have is an edelbrock, it has 2deg advance,retard? Maybe just straiht-up is the way to go...?
 

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From looking at the specs, I'm thinking that it's a Crane H-278 cam. Yes, if you retard the cam timing it will raise the RPM level that the cam works best in, but, you'll lose low and midrange torque in the process. Crane grinds that cam with 5 degrees of advance built in and it works best that way. Mid range torque is far more useful than a few more HP right on top end. The valve float RPM is unaffected by the installed cam timing. I ran your combo through my Engine Analyzer program. I don't have a lot of your specs so I had to assume a few things. I assumd 1 5/8 x 32" long tube headers, with a very good 3" low restriction exhaust system, 9.5 compression, and standard 70's accessory drag. The computer predicted a peak HP of 382 at 5600 RPM and 409 ft/lbs at 4300 RPM. It predicted 250 ft/lbs at 2200, 300 ft/lbs at 2500 and 350 ft/lbs by 2900 RPM. It made over 390ft/lbs from 3600 to 5100 RPM. On top end it made over 370HP from 4800 to 5900 RPM and at 6000 the power was 365. That's a very nice flat power curve and would be dynamite with a 2600-2800 stall converter. That run was with the cam installed as it is ground, with 5 degrees of advance. It sounds like it might be exactly what you need.
 

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Discussion Starter #3
Thanks, I guess I should have given you some other info about the car too...

I have 3.50 gears with a no-slip, a four speed manual, and I definitely plan to put some roller rockers on there as well as a mild port for the new heads.

From what you said though I think running it with normal advance is the way I want to go.

Thanks
 
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