What is the spring rate? Seat pressure at 1.80 does not mean anything without the rate. I still can not find these springs anywhere, not even in the Comp catalog.

You said the heads are stock. With the parts listed your installed height should be very close to 1.75" and you lift with 1.6's is only .544". Had to be a bad stud because nothing else makes sense unless that 26928 spring has something like a 400#/inch rate.

 

if you have 795 retainers, they are a bee hive springs and probably a 26918 spring. The 614 locks and 795 retainers will have a tall set up ht, especially with a stock locator (not a 4705-16 .060 thick locator).

My guess would be that they are set up too tall and have a low seat/open pressure resulting in slack in the valve trane at high RPM. this causes valve float, lifter jumping off lobe, etc and even though the studs can handle ALOT of pressure when gradually applied and taken away, they can handle this jump in load variances in a short period of time and actually be like "wheel hop". This will be like you hitting the studs with a hammer and a properly set up valve trane will never see this kinda trauma.

This will destroy parts very quickly.

I would take and test all springs. Look for 140+ lbs @ 1.750". If all springs are good, set the springs up at 1.730-1.750 and you will be fine.

Lloyd

 

So since I have the 4705-16 locater, should I be ok with the way things are set up? Or will the 4705 seat put my installed height even higher?

The springs are not the 26918, they are the 26928. Physically the same dimensions, but made of a different material and slightly different rates. I can not find the spring rate anywhere either, but I plan on calling comp to get some answers.

 

Weren't the 928 springs temporary replacements for the 918 springs?

 

The way it was explained to me is that the 26928 springs were given out to a couple of the people that got bad batches of 918's in order to prevent any further problems. The 918 springs had to go through a re-design phase, so Comp gave out some sets of the better springs to make up for it.

They are a pretty pricey spring, but I do not think that they are just temporary. I know Speed Inc. switched over to the 928 springs on some of thier head packages. They also list them for sale here :

http://www.speedinc.com/cont.cfm?cid=C0000153

 

You're correct. Temporary was a bad choice of words - the 928's are a nicely upgraded spring.

 

I sure hope so...lol. I just hope they stand the test of time

 

hmm, not fam,iliar with the 928's. My post was "***-uming" that you had a 26918 and were not sure what you had. if you do have the 26928 springs, I am not sure what they are and really can't copkment. sorry.

Lloyd

 

Alrighty guys, I have an update. Here are some specs that I got from Comp. Come to find out, the 26928 was a part number used for the newly designed 26918 springs.

Spring Rate : 313
Open Pressure : 318 @ 1.2
Seat Pressure : 145 @ 1.750
Coil Bind : 1.140

I received the new ARP studs the other day and I bought some new ARP polylocks while I was there. From what I have learned, the Comp 4705 locaters and the 614 locks (+.50) should put me right at about 1.750 installed height. Any opinions or anybody see a reason to change any of the parts?

 

Just for anybody that is reading this, the studs in this link will not work. They are too long on the base threads and will bottom out on the head. ARP-234-7206 will not work. Looks like the correct part number is ARP-234-7202.