head volume

[taber]

what is a good head volume for a pre exr p-67 using 40-50% nitro ?

 

[Ray Sametz]

what is a good head volume for a pre exr p-67 using 40-50% nitro ?

0.64 to 0.69 B)

 

[taber]

thank you Ray.

 

[Marty Davis]

I use .55 at .013" clearance and exhaust timing of 185. I run 50% nitro.

 

[taber]

Thanks for the input Marty. Cant believe I forgot about the clearance and exhaust timing. Thanks again Marty, that is exactly what I was looking for.