383lt1impala

iTrader: (33)

I want to buy a lightweight battery (its going to say in the enginebay) and I see that a lot of them have a low rating of cranking amps. And I have 12.56 compression and I wanted to see what's about the minimum I should go in ca or in cca. I don't want to have jumper cables handy all the time. Thanks for any valuable imput.

Bitemark46

My $.02. You may want to also take into account the starter. Even if you have enough juice to power it the starter may not be up to the task. Then again I don't know how strong GM starters are.

But to answer your question I'd get atleast 675 cca or more.

-Mark

383lt1impala

iTrader: (33)

I 4got to add its the stock starter.

greatskiiiier

iTrader: (10)

starter is going to be your first and big issue, the battery will be fine with anything over 700cca

Black Sunshine/ 00SS

iTrader: (1)

I can tell you for a fact, that the 6.0 starter cranks over with more power, than the F-body one, or the vette one. i know, I changed a few in one day, because I kept overtightening the electrical bolts, and they are very frail.

I like the Yellow top Optima...

You could always take your stock starter someplace & have them rebuild, and beef it up to crank out more juice.

99TransAmLS16Spd

iTrader: (8)

I was wondering the same thing as the OP. I notice that most of the lightweight batteries are only rated at 225-300 cca's iirc.

Wicked94Z

iTrader: (26)

curious as well, also running 12.5x compression

Daredevil_TA

iTrader: (6)

I know some of the braille batteries have CCA's in the 500's and are pretty light

cbra-klla

iTrader: (52)

Wonder how long the stock starter will last with 13.75 to 1 compression