Re: IML: Aluminum Heads on an Imperial 413/440

[sosmi@xxxxxxxxxxx]

Joe, you asked for ideas. The aluminum heads would for all practical purposes,  not be a bolt on and run head. They all typicly have combustion chamber volumes in the 80-90cc range. They use larger valves,ie: 2.18- 1.81, designed for large cams, big carbs, and lots of flow. The valve gear is also usually unique(and costly). Intake and exhaust ports are also much larger, to suit valves. This is good for high rpm hp, but not good for low end torque. It's true there is a benifit by enhanced heat transfer, and the newer EFI engines prove that. Since many run 9-10 compression, and 87-89 fuel, and 200-220 temps. If it wasn't for the electronics, it wouldn't be possible. Ya'll have a nice day, Dave.

 

> -------------- Original message -------------- 
> From: Joe Strickland <jwstrick426@xxxxxxxxxx> 
>
> > Has anyone had experience with using aluminum heads on their Imperial 
> > with a 413 or 440? I have read that the aluminum heads run cooler than 
> > the cast iron heads and help prevent pre-ignition knock at 10:1 
> > compression ratios. Some sites mention that their aluminum heads 
> > eliminate the heat crossover passage too. The new ones would have 
> > improved valve seats to accommodate no-lead fuel too. Any ideas? 
> > 
> > Joe

--- Begin Message ---

• From: Joe Strickland <jwstrick426@xxxxxxxxxx>
• Date: Fri, 19 Oct 2007 15:58:05 +0000

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