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cliffy68 08-08-2016 12:42 PM

Heavy Car Help
 
I have a 1957 Chevy Sedan Delivery. S&W back half ladder bar car. Weight is around 32/3300 lbs. It has a 460 BB, 630 lift solid cam, 11 to 1 compression, GM aluminum oval port heads, not sure of the cfm. ATI T400 with ATI 5200 stall converter, 9" with 4.56 gears, 14/32 Hoosiers. Right now the car runs 7.70's, 7.80's in the 1/8th. Was set up to run 10.90 super street in the 1/4. I am looking to get this car into the mid 6's or better. Trying to get the right combination for the heavy car. Any help would be greatly appreciated.

Swiley383 08-08-2016 05:52 PM

It should run better than7.70 as is. What's the carb and intake? That could choke it down. How well dose the motor rpm?

cliffy68 08-09-2016 06:56 AM

950 Holley HP, Team G intake. Shifting at 6500 it goes into 3rd gear at about the 600 foot mark. I have had it not shift into 3rd at all a couple of times.

Swiley383 08-10-2016 05:26 PM

Something is not right. I have a nova around 3200lbs that with a 9.5 to 1 454 shifting a 5500 with 26x10 in tires was running 750s. The small block I had I was shifting at 6500 same tire but with a 456 gear was going thru the lights at 62-6300rpm. What are your cam specs?

Swiley383 08-10-2016 05:33 PM

I think your converter may be a
Good suspect.

cliffy68 08-11-2016 07:42 AM

I did a stall check and it hit right at 5200. The cam I am not sure of as I am only going off of the information from the previous owner. I have a new roller cam I was considering installing but not sure how much difference that would make with current heads and compression. Again from the previous owner the ATI converter only had 8 1/4 mile passes on it.

Swiley383 08-11-2016 04:51 PM

Have you done a leak down on the motor? Pull the valve covers and check the lash also check to make sure the cam and lifters are good.

cliffy68 08-29-2016 10:35 AM

Leak down test okay. All cylinders are around 92 to 94%. I have no specs on the cam as the previous owner could not give them to me. He claims it to be new. Along with the lifters. Have no idea what the lash is supposed to be so I cet them at 24 intake and 26 exhaust which was within a thou or two from where they were. Maybe just not enough motor for the weight and set up to run 1/8th mile. Going to try and take it to Norwalk for T&T and see how it runs the quarter since installing a box and electric shifter.

cliffy68 09-12-2016 12:50 PM

I have a 714 lift roller with new lifters and springs. What affect, good or bad, might this have on the motor?

mytmouz 09-12-2016 10:10 PM

Depends on the PTV clearance, but it should be an improvement...


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