Generation IV Internal Engine - .631/.644" cam - PTV issues?

I am purchasing a cam for my LS2 motor with 4cc valve relief pistons. .631/.644 lift. Stock stroke.

I am definately going to check my PTV clearance, but anybody out there forsee any issues?

I am purchasing a cam for my LS2 motor with 4cc valve relief pistons. .631/.644 lift. Stock stroke.

I am definately going to check my PTV clearance, but anybody out there forsee any issues?

Im pretty sure we wanna know your duration #s

215/231 .631/.644 cam on a 118 LSA

sorry, forgot to post all specs

215/231 .631/.644 cam on a 118 LSA

sorry, forgot to post all specs

yeah, that will clear by a mile.

Your valve are a maximum lift when the piston is all the way down the cylinder bore. It's during the overlap cycle when you run into piston to valve clearance. Duration is what gets you, not lift. We'll need to know a lot more about your setup. What size heads, what size valves you're running, what size combustion chambers, how much the heads have been milled, and how thick of a head gasket. Give us those details and the duration, LSA and installed intake centerline and you'll get a more more educated answer.

Hey nobody said it was going to be an easy answer.

215/231 .631/.644 cam on a 118 LSA

Thanks

stock cubes, stock heads, stock valves, 4cc valve relief pistons

What springs? (No relation to PTV)

patriot duals

Your leaving yourself NO room for error. If their the golds, then their max lift is .650?

If your running an aggressive lobe profile, and that little margin for error, your askin for problems.

Just my .02
patriot duals

You'll be fine. I ran a similar speced cam in a stock LS2 but with 2 degrees tigher LSA and I want to say I had something like .084 on the intake and .116 on the exhaust.

You'll be fine. I ran a similar speced cam in a stock LS2 but with 2 degrees tigher LSA and I want to say I had something like .084 on the intake and .116 on the exhaust.
yeah but hes cuttin it close on the spring clearance to coil bind.

Lingenfelter claims that they work well with this application....I should be fine spring-wise, I just wanted to check to ensure I wouldn't have any PTV issues.

yeah but hes cuttin it close on the spring clearance to coil bind.


He asked about PTV clearance, not coil bind. :)

Lingenfelter claims that they work well with this application....I should be fine spring-wise, I just wanted to check to ensure I wouldn't have any PTV issues.

They are right, we've had customers come in for dyno tune with this cam and made numbers we would expect of a cam with more duration.

I've seen a graph where someone swapped this cam for some godzilla cam spec'd by one of the people known for custom cams around the forums, which only lead to +5 peak hp and -10hp below peak in an LS2.