Well I did my first 0-60 with the new setup last night, and did a 7.06. Not what it should be and I new I need some serious tuning. It would sit at the stall speed for a bit before really going, and wouldn't really have any tire spin either. I decided to play with the secondary spring, but my buddy has my spring kit. So just for test purposes I removed the secondary spring completely, so the carb would act close to a mechanical secondary carb. Boy did that wake it up! Take off the line great. It should bog completely with no sec. spring. I think my accelerator pump cam is way to wild, causing it to be blah off the line, unless I have the secondaries open to compensate. Anyway I just did another run, 6.60 with traction problems. Hopefully with the right accelerator pump cam, and a good sec. spring it should go down. It was one run too, so I'm sure I could get better as is. 6.6 0-60 puts it at only about 15.0 sec 1/4 mile. Hopefully with the tuning it'll be mid mid-high 14's. How much do you think going to 3.08 posi from the current 2.56 one legger will gain me?
Stock bore, forged 10.25:1 pistons, block decked .020, head decked .005, 3 angle valve job with TA oversize valves, TA212 cam, fully balanced, rods polished and shot peened, heads ported, ta intake, TA comp headers, 2200-2400 stall I swapped in an accelerator pump cam from an off the shelf carb, and didn't change anything... Primary jets are 69... When I had my first holley (600cfm) on the stock engine, and I used a weak spring, I'd step on it and it would bog for a few seconds... I have no secondary spring and no bog... I can't quite believe that this motor actually can take 750cfm of the line with no bog....
how much did u pay for the heads, and what was total for the engine, i might rebuild my 350. your piston are 10.25:1, is that also ur CR?
3.08 gearrs with that cam and ported heads.Why waste your time. With a 3.73 posi and traction that car should run 13's all say long. BTW what size convertor are you running. Those 2.56's are killing that car. Unless of course you drive it everyday and are concerned with economy.
It is not driven everyday, but needs to be able to in case I have to. I'm stickin with the 3.08, should be a big jump from 2.56's. Even with the 2.56's it has traction probs and take's off real good. So 3.08 posi should work out pretty good. I'm running an 11 inch TCI converter. I need to figure out what's up with this carb. It should bog, but it ain't... I'm gonna cheak the float levels, maybe it's spilling some down the barrels... The heads didn't cost that much. I ported them myself and did the 3 angle valve job myself. All I paid for was the valves ($225 I think) and had them milled .005 ($60 i think). And hot tanked also, that was a couple bucks. I also upgraded valve springs and the TA rocker arms. I forget how much that was, but TA has the pricing online. The total machine work on the block and the heads was about $1000. Parts was probally around $2000, haven't really added it up... maybe more....
I'm using a G-tech which has proved very accurate. I emailed holley tech support, hopefully they have an answer for my prob.
David, with 3.73's and a good 60' that car should have the potential to go 13's. As far as the gears go, I have 3.08's in my GS and I can't wait to get some more gear into it. The 350 / M-20 combo can use all the help it can get.
