Discussion in 'Small Block Tech' started by GSDRE, Feb 10, 2016.
I have a 69 gs 350 with a ta 310 cam with factory size tires, and rear gears.:shock:
i go the same route..
and im planning on 2500 -2800 Stall
@least thats what my Cam builder recommendet
Do you know what your Stock gear is? Is it posi? I would say 25-2800 as well but stock gears had a few options best to know exactly what your running there's a few guys on here running the trusty 310. Also what transmission are you running makes a difference too...
I'm running a 400 hydro, factory carb, factory points, factory daul exhaust I dont know my number on my gears.
I'm running similar setup . 70 SP engine . Ported heads, qjet,msd distributer, ta 2.5 down pipes,ta intake,2700 stall in 350 trans with 3.73 rear with 26.5 tire. I'm going to guess your stock GS gear might be a 3.08 and if your GS 350 is actually closer to 9.4-9.5 compression is heads gaskets are not the factory steel shims. I'm going to suggest 32-3300 stall . Mine when I first did my 350 the 310 was weak down low. I have since ported heads and shave .025 to bump compression closer to 10 ,advanced cam 4 degrees,ported intake, had carb done by quadrajet power,added the higher stall and the 3.73 gears. The 350 trans also has a little better first gear ratio then the 400. Just got car back from paint so not sure if that corrected my problems yet.
2500-3000 is what TA recommends, http://taperformance.com/proddetail.asp?prod=TA_310-350
As far as the converter goes use the recommendation of TA as the minimum for good performance. If you are hitting the track go higher. If low ET's are not the biggest concern or you are never going to hit the track with good tires go down to the low side. I hate to say it at this point but any cam that TA lists that is smaller than the 310 with a dual pattern would have been a better choice with a basically stock car such as yours. The split pattern is especially important. You have what you have so you have to work with it. I'm sure you can optimize it but take note of what Eric had to do. The minimum I would do to help it out is get a set of headers on there to help out the scavenging. Factory bent type exhaust is not he best. A nice mandrel bent system with the headers would be better. When everything is set up right I'm pretty sure you should be shifting around 5500 minimum rpm with that cam and if you are not then the cam is a waste of time. That is something most people forget about when putting in a bigger cam. If you want to get the most out of it shift rpm must go up.
This could be a situation where a set of Rhoades lifters would come in handy. I'm wondering how a set of Rhoades lifters installed only on the intake side would work. That would make it something like a low RPM dual pattern cam. Something to think about.
Thanks everyone. Im in the market for some headers,intake,posi unit, and rear gears like 3.42's.
As far as posi and gears you are better off other a 71-72 8.5 skylark/cutlass rear or a 8.2 from 68-72 Chevelle /lemans/ gto the 68-70 8.2 is pricy and hard to get those parts for. The 8.5 will require driveshaft to be shortened about 1.5 inches. Unless your going to the sp3 single plane there isn't any real gains on intakes unless your porting and matching heads and intake. Take a look here for what can be done with the 310 cam and other work. Http://www.v8buick.com/showthread.p...rk-(stock-350-short-block)&highlight=J+staged
Here was some more testing late nov. 2014
Andy,. glad you see these threads useful for sbb people,,,
Thanks Jerrold . Very useful info and example. Be patient and do the job right results will follow