are comp cams 918 beehive springs too much for stock cam & 1:6 rockers?
02-10-2009, 02:42 PM
#1
are comp cams 918 beehive springs too much for stock cam & 1:6 rockers?
Hi I want to replace my valve springs and put on the 1:6 proform rockers[yes self aligning] I have on my 93 lt1 corvette. I found some used comp.918 beehive springs and retainers. They have 130 lbs spring pressure. Is this too much pressure for stock cam or heads? Some cars have pressed in rocker studs. would a 93 corvette have screwed in studs? I know 1:6 rockers with heavy springs and pressed in studs are not good. I also worry the 130lb seat pressure might cause too much friction between cam and lifter. On the other hand it gives me a stronger spring if I do change cams farther down the road. Thanks Tim
02-10-2009, 07:22 PM
#2
Safety Car
I have been running those on my LT-1 for 5 years with no problems.
You should have screw in studs .I run 1.6 on the intake and 1.5 on the exaust with the beehive springs.
You should have screw in studs .I run 1.6 on the intake and 1.5 on the exaust with the beehive springs.
02-10-2009, 08:05 PM
#3
Le Mans Master
02-10-2009, 11:28 PM
#6
Race Director
Your LT1 has screw-in studs.
As AFR pointed out to me, springs will reduce in seat pressure after a few cycles. They won't stay 130lbs for long. (Stock is 120lbs.) You should end up pretty close to that after break in. Also, having a bit more control with a larger rocker can't hurt. You really aren't talking about much change over stock.
The MILD lobes of the stock cam reduces any potential problem of wear on cam/seats even further. I wouldn't worry about it. AFR recommended 150lb springs with an XFI cam -- and said valve control was WAY more important than any potential wear issue that a 150lb spring might induce.
Not so sure about your choice of proform alum rockers though. You might consider a stronger rocker.
gp
As AFR pointed out to me, springs will reduce in seat pressure after a few cycles. They won't stay 130lbs for long. (Stock is 120lbs.) You should end up pretty close to that after break in. Also, having a bit more control with a larger rocker can't hurt. You really aren't talking about much change over stock.
The MILD lobes of the stock cam reduces any potential problem of wear on cam/seats even further. I wouldn't worry about it. AFR recommended 150lb springs with an XFI cam -- and said valve control was WAY more important than any potential wear issue that a 150lb spring might induce.
Not so sure about your choice of proform alum rockers though. You might consider a stronger rocker.
gp
Last edited by GREGGPENN; 02-10-2009 at 11:35 PM.
02-11-2009, 01:42 AM
#8
Le Mans Master
Member Since: Aug 2000
Location: Sydney Australia
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You obviously haven't seem PROCOMP stuff.
The next level down the food chain;especially their MSD ripoff electricals
Advertised as made in Australia but direct to you from China
The next level down the food chain;especially their MSD ripoff electricals
Advertised as made in Australia but direct to you from China
Last edited by rodj; 02-11-2009 at 01:45 AM.
02-11-2009, 01:49 PM
#9
So what exactly is wrong with proform rockers? I have them left over from my other lt1 car so they are free and I'm going to try them. On the springs - I'm going to be checking spring pressure[I bought a gauge to test springs in a vice] and adjusting it with shims. Thanks Tim
02-11-2009, 03:21 PM
#10
Le Mans Master
Member Since: Aug 2004
Location: Metairie Louisiana
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Anyone running these springs?
https://www.patriot-performance.com/...&cat=52&page=2
or these?
https://www.patriot-performance.com/...&cat=52&page=2
I just bought some comp pro mag 1.6 rr's yesterday from Lopers Speed. They were $249 sipped.
https://www.patriot-performance.com/...&cat=52&page=2
or these?
https://www.patriot-performance.com/...&cat=52&page=2
I just bought some comp pro mag 1.6 rr's yesterday from Lopers Speed. They were $249 sipped.
Last edited by rickneworleansla; 02-11-2009 at 03:25 PM.
