Anyone know what lift these springs are good to without binding?

 

They bind at 1.150" so if you know what lift you're running, you can set the installed height accordingly. I'd look for at least .040" coil bind clearance.

 

Thanks for the reply. I am getting my heads back form Lloyd next week with these springs installed. Is the installed hieght something that is adjustable with shims or does it require machining? I thought about going with the higher lift grind below instead of the "standard" XL lift of .536"/.544". Both have the same duration of 224/230.

HIGH ENERGY
Comp Cams 224HL Camshaft 224/230 duration @ .050", .560"/598" lift with 1.6 rockers.

I thought you could just put one set of strong springs on the heads and run any cam you want after that. Guess that's wrong.

Jeff D.

 

You may be correct, but I thought that Comp generally recommends at least .060" clearance.

 

How is the install height adjusted? shims? machine work? The online catalog at comp cams doesn't have "987" anything were the springs are listed.
Thanks
Jeff D

 

Yes, it does. In the Comp Catalog on pgs 338 and 343 is the Comp 987 Spring info. The ID is .697/ Seat load is 121 @ Installed Height of 1.800/ #4754 SHims.

Also, Max recommened lift is .500 coil bind at 1.150

 

I am, and they do... so take that FWIW

I'd like to see more as well, i mean.. why not, but with what he mentioned, it may not happen.



Installed height can be changed with shims & locators, cutting spring seats, different valve lengths, different keeper's, the valvejob itself, etc. I'd have a hard time believing the people doing the work arent taking care of this stuff.. if you haven't, you should just have them set your stuff up for what you're wanting to run so you don't have to worry about it.

 

Recommended max lift of .500. That sounds low for this spring. I mean, I see alot of people with .500+ cams using it. Think I can run it with the 224/230HL cam with the .598 exhaust??

Thanks for your input guys. I am on my first pair of worked heads.

Jeff D.

 

i think that spring is advertised at being able to support cams with lift up to .600" max. that is with an installed height of 1.800". FWIW i installed a set on my car with the recommended locators and keepers running the XE224/230. it is the "regular" one... not that high lift cam you are talking about. i think the max lift is .544" with 1.6 RRs and so far everything is fine.

 

The Comp Catalog definitely says the 987 has MAX recommended lift of .500. You might get away with .525, but I wouldn't try .598

 

1.800 set up ht and 1.150 coil bind leaves .650 lift before coil bind. Subtract .050 for coil bind and you are good to .600 lift.

I am not sure why Comp recommends .500 lift. ?????

These springs work fine on .580 lift and smaller hyd rollers. If you are gonna use .600 or larger, a Comp 977 might be better but would probably need Comp R lifters to handle the added pressure. Some people have probably ran that cam with the 987's and no problems but I would want a different spring just to be safe.

NightTrain66

 

Thanks for the info. Forgot about the lifters. Going to try the normal XE grind that I got and run it for awhile.

Jeff D.

 

Comp cams also recommends no more than 350lb open load on the pro magnum rr's. The 977 springs are 419lb. The 987 are 325lb. Looks like you got to spend alot more money to run the higher lift cam without taking chances.

Jeff D.

 

The comp cams cam help line told me either 986 or 987 would be fine for my .555 lift, I mentioned the catalog said .500 max for both and he said that wasnt right, these are both good to well beyond .500. FYI the The Lt4 heads have a standing height of 1.800 stock but I believe the Lt-1s were only 1.750 so you will need machineing. not to mention you will need to make sure the spring sits flat in the seat. (both have larger than stock diamaters) Make sure you order retainers and locks from comp to go with them, The factory retainers will not work with these springs... Abd the locks are 10 degree

 

Thanks, the heads are already machined and have the 987 on them right now. I was just wondering how much lift they could handle. Basically, it looks like the whole valvetrain needs to be upgraded if I go with a higher lift cam and stiffer springs. So thats out for now.

Jeff D.