i have a 2007 4.8l rcsb

i would like to get a cam with the specs: 216/220 112LSA +4 .561/.564. also i want a thinner head gasket of .42 rather than the stock .52. what size push rods would i need? or is this something im going to have to check when i have it assembled in the truck.

 

any body know how far the pistons stick out of the hole on the 4.8l's i need to know so i know what heads gasket we can use on his eng. .42 should work great but can we close the quench even more?

 

anybody?????

 

anyone??? help

 

Gotcha. Here is the pushrod length calculator on tech. http://ourworld.cs.com/ls1info2/Pushrod+calculator.xls It seems to be fairly accurate. Ive used it a few times Make sure you know the base circle of the cam. Hope this helps.

 

which cam lobes does comp start going away from stock base circle?

 

I would buy a length checker with the rest of your order. Probably end up back at 7.4 but geometry is a **** and the best way is to buy a checker the math will always have some margin of error.

 

a .42 would be bad very very bad

 

oh gotcha i was like WHAT then realized lol. .042 there thats better.

 

I'm .010 out on my 5.3. I run a .042 cometic so that's .032 quench. Stick out varies from 1 motor to another so you have to measure it.