Originally Posted by mr 4 speed
Gary,what is the advantage of the 6.385 rods and the Probe pistons?
I'm guessing they are alot lighter than stock
Pretty impressive performance considering stock intake,manifolds,etc.
1970 LS-6 Pump-gas Special
Hi Chris, the long rod gives a more efficient "burn" and the "Probes" are actually part of an ongoing test of their pistons. We chose them for a number of reasons, first they have a decent price, second, they came in 540 grams with some dome removed, and third, they're forged on the 2618 blanks. They did come without pin-oilers and at first we were going to install them but changed our minds as part of the piston "test". The unit is already scheduled to be redone over the winter season with an upgrade on the cam from the 238/248 x .550-.570 to a 248/258 x .570-.600.
The E.T.'s are not too bad considering the street tires but we're dissappointed in the mile-per-hour. We need more upstairs. As of today we feel the cam is the deterrent. But you have to remember the power-brakes MUST be functional. They work good with the existing cam and we want to try the next one up! The larger cam will do 2 services, it'll give more power in the upper band AND kill some low-end Torque where we don't need it with the street tires. The 4000# weight is a benefit with "hooking".
A "key" item to remember here is it runs fine on 93 with all the timing up front, the C.R. as I stated has been knocked back to exactly 10:1. this is NOT a stroker, these units get "pumped-up" for size at the meets.
I have a 402" '70 Nova headed to the dyno this week for the same class racing. A square port head and ALL stock inside pieces. No lightweight parts whatsoever, no "tricks". This one has the stock 242 x.500 cam AND stock rocker arms. Thanks, Gary in N.Y.
P.S. 68chevelle533: Car is automatic with stock convertor and I'm not sure about the tires, but I believe the "rules" for his class must have the identical ones there when the car was delivered new. To the best of my knowledge,
no radials allowed. Strict rules for his class, no MSD's, stock coil, stock wires, stock valve covers, etc.