According to my Comp Cam catalog they will work on a LT 1. Anyone tried this, need machinhing ? Cost of springs ?
THANX

 

They do work for Lt1's . I'm interested in using these springs. I called up comp and they gave me the part#'s . Summit has them in stock the price was good for all the parts. As for the heads needing to be sized for the spring I belive they don't need to be..

 

Price of springs from Summit & p/n ? Retainers to use ??????????

 

These are the part #'s that comp gave to me for my cam lift of 544/576. The best thing to do is call comp cams and give them your set up.
Part #'s from comp and prices from summit.
springs 26918-16 $228.96
retainer 787-16 $66.56
lock 648-16 $27.04
Hope this helps..

 

Thanks for the info.
Last time I called Comp Cams; put on hold for 5 min., then the "help" I got was truly sad.

 

Here is some more beehive info FYI.

You may want to go with the 26915s instead of the 26918s unless you
really need that much spring pressure. With stock LT1 heads you will
need the Comp 4705-16 spring seat/locators:

OD = 1.300" Shoulder OD = .860" thickness = .060"

The other thing to note is that the most installed height you can obtain
with this seat and using the 795-16 retainers and 614-16 (+.050) locks
is about 1.750". This should be OK unless you decide to use the 26918
springs. If you use the 26918 springs you may want to grind down the
seat to .040-.045" so that your closed pressure is not extreme.

 

I have used the 26918 bee hive springs on a few LT1's. They use the stock spring locators and require NO extra machine work. I have only used them with to Ferre 4.960 long valves and the 611 locks work out fine. With a stock length valve, you might need the +.050 locks to get the spring pressure right.

Lloyd Elliott
972-617-5671
NightTrain66@msn.com

 

Lol i as just getting ready to say Lloyd Elliott uses them.

Great customer support BTW. Answers ALL of my questions and helps me out with everything.

 

Bret, which is the better choice for a .580 lift cam that will turn to ~6800 with LE heads? Beehives or comp 977s

 

Yo Spinner:
I'm trying to avoid the problem that got you. I see that you also don't want a repeat.

 

Although the 26918 beehives and 977 springs will possibly RPM up to 6800 RPM, I try and use the 26918 bee hives and 977's on set ups seeing up to 6600 RPM or so. These will work with stock length valves.

If you plan on seeing 6800 RPM on a regular basis, a "better" set up would be with +.100 long valves and a different part # bee hive spring. Thus would pretty much make the valve trane bullet proof with a hydraulic roller to 7000 RPM or so.

Lloyd Elliott
972-617-5671
NightTrain66@msn.com

 

Llloyd has a good setup for that situation. I really like the beehives and Ti retainers for high RPM hyd roller stuff.

Bret

 

How do you calculate how much spring pressure is required or too much/too little? What is the difference in the 915's and 918's effect on any given cam? I know the loads rates are lower for the 915's, but how does that affect performance?

 

Thinking of getting 918's with 772 retainers, what is the max lift for these springs on a LT1 application?

Looking to use them for a gm847 application and dont want to pull the heads for dual springs.

 

The specs for the springs are here: Comp Press Release

You can see that coil bind for these springs is at 1.085". So it all depends on
your installed height. If you set up with longer valves so you can achieve a
1.80" installed height, you will have .715" to coil bind. If you don't have longer
valves and want to run the LT4 or stock spring seats, you can probably end
up with an installed height of around 1.77" if you use the +.050 super locks.
I still don't like the fit with the LT4 or stock seats though. This setup will give
you .685" to coil bind. This should handle .600" lift with plenty of safety margin.

Here is a picture I took of a 26915 spring and an LT4 spring seat. You can see
the gap between the spring and the seat. This is after compressing the spring
on my arbor press (i.e., the gap does not go away when compressed). Take it
for whatever it's worth. 26915 w/LT4

You need to take all my beehive comments with a grain of salt though because
I'm not sure if the 26915 I have installed are working properly. I would like to
think that they are a good product, but the jury is still out for me.