FastNTopless

I was wondering if I am running a .651 intake and a .608 exhaust lift on my cam would installing a valve spring kit rated at .660 lift be cutting it too close?

PREDATOR-Z

Why such big lift on intake? What can your heads handle, meaning what is your flow at .650?

FastNTopless

I have a Comp Cams 54-000-11 custom cam with the following specs: adv dur 289 (intake), 289 (exhaust); dur @ .050 is 239 (int), 239 (exh); lobe separation-111.5; valve lift is .651 (int), .608 (exh). I have to change the valve springs because I broke my #7 intake valve spring. Obviously I have too much lift for the springs. I have stock LS6 heads (243 cast) w/ stock springs. I bought the car the way that it is. I'm trying to figure out the method to the madness. This car has left me with more questions than answers.

SOMbitch

iTrader: (8)

Make sure the installed height is correct and you should be ok. I think TSP sells a spring that is a drop in good to .700 that will give you a little more margin but they are not cheap...

FastNTopless

Here is a picture of the broken spring. It appears I was mistaken, the valve springs are not stock, they are dual springs. I don't have a lot of time during the week to work on my car so I just glanced, saw the broken valve and professed that the sky is falling...lol. I ran a fiberscope into my cylinder through the spark plug hole and looked to see if there was any damage. The piston was untouched (probably because of the dual valve) so I think I'm just going to change the spring and call it a day. The next hurdle is finding out what type of dual spring I have and the lift parameters. Take a look and tell me what you think.

Whiteaw57

iTrader: (2)

maybe patriots? kinda look like prc duals but those would be pushing the lift limits. with 243 heads Id do two things, first change the cam to something better for the heads, and second get a new set of springs. If it broke one its gonna break more.