Yeah, Paxtons ball drive are not that great,,,yes, they are very quiet,but once you overspin them,forget it.
The Early McCulloch will not make as much boost pressure as the later Paxton ball drive set-ups.
The So called race compressor wheel was never an option as far as I know for the McCulloch.
The early McCullochs only made 4-6 psi max on a SBF 289 that had a standard small camshaft.
My 250 6 had a large camshaft,IIRC,236 degrees duration @ .050 on a 114 lobe center .550 lift. Part of the reason I could not make that much boost pressure,if I had a stock camshaft,I would have probably made 12-15 PSI
I could only get 8-10 psi max out of my SN-89 Paxton w/a race compressor wheel installed,JR Granatelli(SP),he said I could make 15 psi no problem & bought it indirectly from him as I was @ the business where I bought it through & he had delivered it to me.
I overspun mine one time & it instantly started making noise.
They sold there ball drive blower line set-up to Paradice (SP) ,they (Ball driven blowers) are not great for high pressure output,they start to slip,that's why they are gear driven now. The Novi series.
My Camaro ran low to mid 12's w/only 8-9 psi,& it was dead quiet,I gave my friend a ride in it when I had the blower on it & he just said,man, this thing makes some great torque! He did not know I had the Paxton installed.
MBHD
