[R 70 Judge]

Originally Posted by Pigeon

Just a side note. I replaced the 45 lb conventional battery with an antigravity ATX-30-HD in my ‘64 GTO race car. I run a 75 amp Denso alternator. Motor is a 12.5:1 compression, 4.5 inch stroke 488 and cranking compression is 210 psi. Powermaster starter. I have a 16” electric fan, A1000 fuel pump, trans cooler with electric fan and an MSD 6A ignition. Bottom line, it spins the motor like turbo! I can’t believe that little battery that weighs nothing can store enough energy to perform like that. No between rounds battery charging and after unloading at home I hooked up the charger and it topped off in no time!
PS I set a PB of 9.25 at 142.5 mph in my single 4bbl foot break GTO.

My engine is nearly 14:1 and it spins at 325 rpm now while cranking with the new battery. It definitely helps with syncing the cam/crank sensors and keeping the EFI parts happy.