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**VetteVet** · 02-03-2017, 12:57 PM

Your tests look pretty good until the 2 volt drop on the battery. 575 CCA is borderline low IMO. I would go with a minimum of 600 and 800 will most likely solve your problem. Just for insurance I'd replace the 4,0 cable with a 2.0. The ground cable is fine at 4.0., if you're going to the engine block first.

Do a timing check with the vacuum line off the distributor and plugged. if you're at 12 degrees BTDC, back off to 10 and if at 10 try 8. You want to run as much advance as you can without detonation and loss of performance.

02-03-2017, 12:57 PM	#10
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,703	Re: Hard start question Your tests look pretty good until the 2 volt drop on the battery. 575 CCA is borderline low IMO. I would go with a minimum of 600 and 800 will most likely solve your problem. Just for insurance I'd replace the 4,0 cable with a 2.0. The ground cable is fine at 4.0., if you're going to the engine block first. Do a timing check with the vacuum line off the distributor and plugged. if you're at 12 degrees BTDC, back off to 10 and if at 10 try 8. You want to run as much advance as you can without detonation and loss of performance. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.