Budget Head Question
Thread Starter
Drifting
Joined: Apr 2005
Posts: 1,340
Likes: 3
From: Levittown NY
Budget Head Question
A little overview:
I'm using my stock LS1 heads with stock valves. I am getting the heads ported and polished with a 5 angle valve job. I'm running Comp Cams 918 valve springs and the cam specs are:
Basic Operating RPM Range: 2,000-7,000 RPM
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 224 int./230 exh.
Advertised Intake Duration: 273
Advertised Exhaust Duration: 279
Advertised Duration: 274 int./279 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.581 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.588 in.
Valve Lift with Factory Rocker Arm Ratio: 0.581 int./0.588 exh. lift
Lobe Separation (degrees): 114
The question is...I want to use my stock valves and not upgrade to the stainless steel solid valves...Will the stock valves be able to handle the spring pressure of the 918's...Has anyone ever dropped a valve into the motor???
I'm using my stock LS1 heads with stock valves. I am getting the heads ported and polished with a 5 angle valve job. I'm running Comp Cams 918 valve springs and the cam specs are:
Basic Operating RPM Range: 2,000-7,000 RPM
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 224 int./230 exh.
Advertised Intake Duration: 273
Advertised Exhaust Duration: 279
Advertised Duration: 274 int./279 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.581 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.588 in.
Valve Lift with Factory Rocker Arm Ratio: 0.581 int./0.588 exh. lift
Lobe Separation (degrees): 114
The question is...I want to use my stock valves and not upgrade to the stainless steel solid valves...Will the stock valves be able to handle the spring pressure of the 918's...Has anyone ever dropped a valve into the motor???
