Well i am swapping out my 918's for the PAC 1518's . The PACs and 918s
install height is the same at 1.800 . Well i dug out a stock spring to reference
for this big problem . The micrometer is reading .935 if im reading this correct with the beehive retainers . There is no shims just the stock valve seats .
The reading is WAY off . .935 is right around the stock spring height .
What am i doing wrong here ??? Thanks in advance

 

Is the retainer sitting on the outside of it or the recessed inner part? If its sitting in the inner part you need to find out how much lower it is than the top since its ment to have the retainers sitting on the top part. On my comp micrometer the inner part is .130" lower, so 1.88" on the micrometer ends up being 1.75" which is what I'm setting them up at.

 

The beehive retainers are sitting on the top part of the micrometer . brb with pic...

 

Heres a couple pics of the beehive retainers on the micrometer ...

 

That's not the top part, the micrometers are designed for the springs to sit on the top part thats wider.

 

Ok that is where the .150 i have to add to the height is coming from ?
The stock retainers also sit on the same surface the beehive retainers do,
so is it still incorrect ?

 

so i get .935 + .150 = 1.085 . Is this correct then for the height ? Sorry
just really confused

 

Does that really look like only an inch to you? And if the lower step is .150" down from the measurement point...why would you add that number?

You are reading 1.935" minus .150" = 1.785"

 

Damn i feel retarded now When i feel like i screwed something up
i cant think straight and i ask dumb questions Thanks a million for all the
help guys

 

I do the same thing sometimes, another thing I do is look for the most complex reason why something is not working right rather than stepping back and looking at the simple stuff first

 

Thank you for the help. Would a safe install height be between 1.765 to 1.800???

 

Has anyone removed/replaced beehives with the heads on using the KD screw-type spring compressor?

At the end of this season I plan to replaced my Comp 918s with the PAC 1518s.

WD

 

That should be fine

 

Not on a ls1/lt1, but on the other engines I've used them on they worked great. For ls/lt I made my own using the a stock rocker.

 

I don't know if this is true or not but I read online that those type of compressors with aftermarket springs isn't a good idea since it scratches the surface on the springs. + the crane compressor is worth its weight in gold, it make spring swaps a piece of cake.