Never mind on the le3 cam. With the 847 wouldnt the crane 10308 kit work, their good till .600 i searched and nothing was really said about their " compatibility" thanks

 

The 847 is at .595" with 1.6 rockers. The Crane site shows the
99846 spring for the 109841 cam which is the same as the GM 847.
The 10308-1 kit contains 99893 springs so I would not use it with
the 847.

Coil bind is at 1.1" for the 99846. If your installed height is 1.75" to
1.78" you should be fine, with 1.78" better than 1.75".

 

go with the beehives. I used them along with a stock (new)timing chain and STOCK lifters..beat the **** out of my car every single day I drove it and never had a single problem. Beehives are easy on your lifters.(spun the car to 6500 daily)

 

Im running beehives on my car, havent experienced any problems with them yet.

 

beehives... definantly

 

I have the crane springs, but check your install height. If I remember right mine have the tiniest shim on them, but still plenty of wiggle room.

 

I have a cam that I'm installing next week that's almost 100% identical to the GM847. After talking with Cam Motion about it, they gave me some recommended seat pressure and spring rate specs. I came back to them with a list of springs that matched the requirements and they recommended the Comp 977 springs.

Do not run 987's, you will get valve float. That spring is fine for a smaller cam like the XE 224/230 that I'm running, but a bigger monster like the GM847 is gonna need a no-holds-barred valve spring.

 

I'd go with the K Motion K-800 springs. I ran them with the GM847, so have a number of others with no issues.

 

k-800s are a little heavy on the pressure, but you can run them, they certainly will handle the lift.

I ran CM612 springs for a while with my 847. I only swapped them because everyone freaked. Just get something with the right pressure and height and verify both.

 

I been using the crane 10308-1 kit with no problems. The K-800 are good spring's also.

 

Generally speaking, is anybody using a lighter than recommended spring in conjunction with a REV kit?

 

What would be the point?

 

Well, there are alot of reasons to keep spring pressures down if you can. On a budget oriented note, longevity of aluminum 1.6RRs would be increased dramatically on high spring pressure apps if you can manage to stay well below the plastic deformation range of the AL. Compare budget Scorpions or Proforms to Comp Cams Pro Mags, and you could have a REV kit and aluminum RRs for less.

For valvetrain longevity, lower spring pressures make parts last longer. Ask any valve seat in a daily driver getting b!tch slapped with 310 lbs of seat pressure for a couple thousand miles a month. You can overcome aggressive ramp rates with big springs, but if you control mass and momentum where it occurs (ie- lifters), you can get away from putting high loads on ancillary parts.

 

Makes sense... Thanks for the info!
I'm going to take my chances (even though not a daily) and run my 250/500lb spring pressure so my seats can be b!tch slapped.

 

Makes sense... Thanks for the info!
I'm going to take my chances (even though not a daily) and run my 250/500lb spring pressure so my seats can be b!tch slapped.