Thanks Spud:)
Yes I'm doing some calculations.
I'm starting to getting a good baseline for my 290 cid. Blown Ford Flathead V8 on Alky.
But it has been some runs to get there:/
Here are some facts that I'm curious about;
I use a Hilborn pump 150-1 and 4x64A nozzles in the Hilborn 2-port on top of the unstrapped GMC 4-71.
At the moment we are set up with 52% OD. 44-tooth on top and 67-tooth on the crank, that gives about 22 psi of boost.
Idle bypass with no pill, just shimmed to about 9psi. Main is set up to 4-5 psi with .85 pill.
High speed is 50 psi an a .45 pill. Spark plug reading looks like we still are on the rich side.
The four 64A is something that was suggested by Hilborn.
I have always thought that the total flow or areal is large.
So got a friend in the UK with a blown Flathead on Alky. He runs with just 7psi of boost.
But he got just 2(two) 63A nozzles from Hilborn with the same pump??
Thanks again for your service Spud:)
BR
Kjell