I don't have the cam card in front of me at the moment. Its a BBC UD hyd. flat tappet cam. Adv. duration something like 288/29?, .050 duration around 23?/23?, 110 lsa, .550/.575 lift.
I have the UD springs for it, they are single springs with a damper.
Since there are no inner springs, I would assume that I just use these outer springs and don't worry about spring pressure during break in (other than setting up the heads with the correct installed hieght ect...) Are these springs supposed to have inner springs for this cam? I currently have new comp cams springs in the heads that came with the magnum 292 cam kit (inner and outer with damper). Which springs should I use?
If I use the UD springs, do I need to use break in rockers or just normal ones?

Dennis,
Don't know what spring came with the cam but I personally would prefer the dual spring. It should be a Comp 924. If so, just use the Comp outer to break it in & set the Comps at 1.880 installed height.
This should put you about 120 seat, 320 open or so

Thanks for the reply Mike. I think I'll use the comp springs then. Can I use break in rockers instead of only running the inner spring? I ask because I do have the air chuck and the spring compressor to change the springs with the heads on, but it looks like it would be a real PITA to get to some of those back springs with the engine in the car ('72 'velle) and we have had to take engines in and out of that car way too often over the last couple of years.

Dennis,If you don,t have the breakin rockers already it really wouldn't be worth buying unless you plan on doing more motors.I used the outer springs and a pry bar type spring compressor and it wasn't that bad to do,goodluck! graemlins/waving.gif

Originally posted by fourfiddyfour:
Thanks for the reply Mike. I think I'll use the comp springs then. Can I use break in rockers instead of only running the inner spring? I ask because I do have the air chuck and the spring compressor to change the springs with the heads on, but it looks like it would be a real PITA to get to some of those back springs with the engine in the car ('72 'velle) and we have had to take engines in and out of that car way too often over the last couple of years. Yes this is how we break in almost everything on the dyno. But as was stated above, unless you are doing this a lot, they ain't real cheap.
I guess you could always rent them out to other TC members for a nominal fee though :D

As long as pressures aren't far over that 120/320 mark, everything is OK. Obviously, single springs with damper are broken in as is. Make sure you use plenty of break-in lube--MolyDiSulfide, the famous 'White Grease', and you'll be OK.
Thanks' everyone, for the good advice given. I appreciate everyone filling in when I'm not here...

UDHarold

thanks for the info guys. graemlins/thumbsup.gif I do plan on building more engines so break in rockers might be worth it (aspiring engine builder starting off as hobbyist), i'll have to check the price though. I also have to figure out if I can use them on pontiacs too. I run 7/16" BBC rocker studs in my pontiac engines, but I don't know if the bbc break in rockers will work too. If they do, then I will definately buy a set.

Just to clarify, since the single springs get set to 120/320 and they would be fine for break in, if I use the comp springs and make sure they are set to 120/320 with the inners in place, would I be able to break in with inners and outers? or am I just asking for trouble?

Harold, are you able to grind any UD pontiac cams at Lunati? I've seen some really quick pontiacs in Pontiac High Performance's shootouts running UD cams. You can email me at quill78@localnet.com if you don't want to reply here, being that it is a chevelle's board and all :D

Just to clarify, the 120/320 number is where you will be with both the inner & outer reinstalled after breakin when you put the inner back in. It will be much less with just the outer during breakin,

thanks again Mike. smile.gif