05-05-2012, 11:53 PM
I'm in the middle of a LS3 build and need opinion on using production LS3 intake with Comp 618 beehive springs.
05-06-2012, 07:58 AM
I assume you mean 918 spring
unless the cam is very mild I would not use those springs. The valve is light but still alot of valve to control. I have been using the lunati dual kits and they are great for that valve with a wide varity of cams.
Comp Cams 26918-16 - Comp Cams Beehive Valve Springs Details
OD: Top 1.075" Bottom 1.310"
ID: Top .650" Bottom .885"
Seat Pressure: 125 lbs @ 1.800''
Open Pressure: 367 lbs @ 1.150''
Coil Bind: 1.100"
Spring Rate: 372 lbs/in
05-07-2012, 02:31 AM
Thanks for the reply. In looking at the valves we were able to pull a manufacturer name off the stem. Looks like they are supplied by a division of Mahle that is located in Argentina. Yes these valves are very LIGHT, I weighed them at 89grams on the balancing scale at the machine shop I have my work done.
I'm thinking they will be OK with the medium sized Comp XFI profile I'm going to run, 226INT@0.589lift/238EXH@0.608lift. I have these same 918spings/tool steel retainer on a GENI small block with a solid flat tappet that revs heavier valves to over 7K RPMs.