Re: Overdrive and camshaft selection
I guess my next project will be swapping to another cam.
I will probably go with a custom roller, but in all honesty I want something in the 230/236 range on a 112 with around .600 lift. I think it would give me a little broader torque range and better driveability with a stick. Of course I will try with my current cam firs though.
As for my cam on a 108 and the duration it has, I make around 6 inches of vacuum.
Isn't that only if the torque converter isn't passed stall speed? Otherwise it is just slipping and creating heat. If you are able to pull 2.87s and a stock stall, you really can't compare your set up with a performance engine. Two whole different beasts
Most manufacturers of Over Drive Automatics recommend a lock up converter if running a final drive higher than 3.55.
On my TCI 6x, The lockup is darned near a 7th gear. I rigged a switch where it will stay in lockup on the htway all the time. With the 3000 stall converter, it is annoying feeling it go in and out. The 540 has so much torque I can leave it in lockup.
'67 Chevelle Malibu, Catalina Blue, 540 inch Rat, Air Flow Reasearch 290 CNC Heads heads, Custom Hyd Roller, .675 lift, 234, 244 at .050, Lemons Headers, Holley Multiport Fuel Injection, TCI 6X 6Speed Automatic, 12 bolt Posi Eaton TruTrac, 3:31 Richmond Gears, front and rear power disc brakes, Global West Suspension, etc.
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