What pushrod length/preload would you run?
04-21-2013, 07:45 PM
#1
What pushrod length/preload would you run? A little backround, I recently installed some 799 heads with Manley race flow valves and a set of LS7 lifters. I need to run two different length pushrods cause the intake valves sit a little lower than the exhaust valves.
Here it goes. With the comp pushrod length checker on the intake valves I came up with 9 2/3 turns to zero lash. 9.66 x .050= .483 + 6.8= 7.283. Now, I have 7.350 or 7.375 pushrods that I can use. The 7.350 would give me a preload of .067 and the 7.375 would give me a preload of .092 on the intake side.
The exhaust valves came out to 9 1/3 turns with the comp pushrod length checker. 9.33 x .050= .4665 + 6.8= 7.2665. Now, I have 7.325 or 7.350 pushrods that I can use. The 7.325 would give me a preload of .0585 and the 7.350 would give me a preload of .0835 for the exhaust side.
To sum it up:
INTAKE - 7.350 = .067 and 7.375 = .092
EXHAUST - 7.325 = .0585 and 7.350 = .0835
Which setup would you run?
Here it goes. With the comp pushrod length checker on the intake valves I came up with 9 2/3 turns to zero lash. 9.66 x .050= .483 + 6.8= 7.283. Now, I have 7.350 or 7.375 pushrods that I can use. The 7.350 would give me a preload of .067 and the 7.375 would give me a preload of .092 on the intake side.
The exhaust valves came out to 9 1/3 turns with the comp pushrod length checker. 9.33 x .050= .4665 + 6.8= 7.2665. Now, I have 7.325 or 7.350 pushrods that I can use. The 7.325 would give me a preload of .0585 and the 7.350 would give me a preload of .0835 for the exhaust side.
To sum it up:
INTAKE - 7.350 = .067 and 7.375 = .092
EXHAUST - 7.325 = .0585 and 7.350 = .0835
Which setup would you run?
