Originally Posted by Cab_Burge
I had two group 24 12 V deep cycle marine batteries in my Cuda and I would charge them for around 48 hours with a self regulating 4 amp trickle charger to top the batteries off before going racing.
They would charge up to 13.8 to 14.3 on the charger and would settle down to 12.6 to 12.9 volts after sitting over night.
The 100 amp Powermaster alternator would charge, show on the voltmeter,14.5 V running and the batteries would stay above 12.5V at the local 1/8 mile races at the end of the day. I would take that same charger and charge them during the long ( usually from 45 minutes to 1 1/2 hrs. lunch break that track took up
That car did not have big electric cooling high amp draw fans on it as it didn't have a conventional radiator, electric fuel pump, MSD 7AL2 ignition and big electric water pump with a small cooling fan on one of the oil coolers used as the radiator. Not a lot of amps used to run that car shruggy work
The starters on our car are the biggest amp draw on the batteries usually work
We normally don't drive them long enough at the races to recharge the batteries after every motor start twocents


One issue we had was with lead acid batteries. When you get low enough on the 60ft, those batteries don't last long anymore. We switched to those AGM red top batteries. I like them, but they do not have a lot of reserve, so a good charge system is a must. And then add to that a 14.5:1 engine to kick over, and you can see how going faster adds up...

'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk