Do these 440 dyno numbers look right?

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Ok - so you've got what's required then. Too little preload is better than too much IMO but yes, it can change how the cam behaves. Maybe it is a case of the dyno being a little off. If it runs well aside from the numbers - then wait until this Siberian winter ends and take it to the track...
 
Was this a chassis Dyno? If so what about converter slip? What Stall and size converter are you running? What about the rest of the driveline? Transmission? Rear axle?
 
moper said:
Ok - so you've got what's required then. Too little preload is better than too much IMO but yes, it can change how the cam behaves. Maybe it is a case of the dyno being a little off. If it runs well aside from the numbers - then wait until this Siberian winter ends and take it to the track...
Click to expand...

I agree 100%. When I have an adjustable valve train, I like running them a tad loose. I think though hydraulic rollers are an exception to that rule though. Everything I've read and experienced says they like more preload.
 
dwire67 said:
Was this a chassis Dyno? If so what about converter slip? What Stall and size converter are you running? What about the rest of the driveline? Transmission? Rear axle?
Click to expand...

Chassis Dyno. This is a 4 speed car with 3.55 8 3/4 rear.
 
Well I'll definitely be readjusting the valves shortly. Is it possible I have the cam timing advanced too much? I seem to remember I advanced it some to lower the power curve because of the size of the cam, but don't remember how much. I'm bad about researching and not making a record of what I did and why after making a decision. Now I want to tear it apart and see what it is set at and possibly adjust it. I really don't want to since I just got it back together but I'd like to have it running great this summer so I'll have to make time.

I know that advancing the cam timing will bring the power in sooner but will it also make less power due to the lower RPM's? I thought it was interesting that the motor is able to idle at 600 RPM but I attribute it to the Atomic EFI working it's magic.
 
Again - you don't know for sure if it's "running great" or just the dyno. So I'd be patient and wait until you can get real data.
 
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