Posted By: RapidRobert
Comp cams 925-16 springs, good choice? - 03/27/11 03:31 AM
Daily driver BB w stock(ish)cam. Found these for a good price, is this too much spring for my app? Dual sp w dampener 395 lbs. Thank you for your time.
Comp cams 925-16 springs, good choice?
Posted By: ahy
Re: Comp cams 925-16 springs, good choice? - 03/27/11 03:48 AM
If you have stout rockers and pushrods they will work and last... just a bit overkill and will put more stress on the cam/lifter/valvatrain than necessary. I would guess they will hurt stock stamped rockers. Sometimes shops like Hughes have "take off" springs from Ed or 440 source heads at low cost. That may be another choice... or a new single spring at about $6 each.
Posted By: RapidRobert
Re: Comp cams 925-16 springs, good choice? - 03/27/11 03:53 AM
Thanks Ahy, I'll get on it & find a better choice
Posted By: NITROUSN
Re: Comp cams 925-16 springs, good choice? - 03/27/11 04:03 AM
Did you check the specs on a stock spring? I dont have a manual here but they may not be to far off. The closed seat pressure is about 110.
Posted By: RapidRobert
Re: Comp cams 925-16 springs, good choice? - 03/27/11 04:16 AM
Quote:No I haven't yet, a guy has those new comp ones for $75
Did you check the specs on a stock spring?
Posted By: NITROUSN
Re: Comp cams 925-16 springs, good choice? - 03/27/11 04:20 AM
What are you running? I can check my fsm's on the stock specs to see how close they are.
Posted By: RapidRobert
Re: Comp cams 925-16 springs, good choice? - 03/27/11 04:22 AM
Actually it's the same Summitt 6401 cam that he is working w on the cam degreeing thread 
Posted By: NITROUSN
Re: Comp cams 925-16 springs, good choice? - 03/27/11 04:23 AM
what heads?
Posted By: RapidRobert
Re: Comp cams 925-16 springs, good choice? - 03/27/11 04:25 AM
452's
Posted By: NITROUSN
Re: Comp cams 925-16 springs, good choice? - 03/27/11 04:29 AM
That cam is not radical..I have specs in the shop on the oem springs to compare. I will try to get them tomorrow
Posted By: RapidRobert
Re: Comp cams 925-16 springs, good choice? - 03/27/11 04:40 AM
Thank you bro
Posted By: NITROUSN
Re: Comp cams 925-16 springs, good choice? - 03/28/11 01:46 AM
Factory specs on a 76 b-rb head was this
free length 2.58
closed seat pressure 121-129 @ 1 55/64
open " " 192-208 @ 1 7/16
id 1.01 1.03
installed ht. 1 53/64 to 1 57/64
cam lift was .430
On a 69 b-rb head there were std and hp specs.
free 2.58
closed seat pressure same as above
" " " HP 110 @ 1 55/64
open seat pressure same as above
" " " HP 236 to 256 @ 1 23/64
installed heights same as above.
Cam lift std .425 I and .450 E
HP cam lift .435 I and .458 E
Looking at comps specs I think you should be fine. The 388 open pressure is at 1.200
The one item that bothers me is the inner springs ID at .697. Some guides need to be cut and a special seal used so the spring will not take off the seal. If you have to do that and pay for it buying the right springs may be the best option.
free length 2.58
closed seat pressure 121-129 @ 1 55/64
open " " 192-208 @ 1 7/16
id 1.01 1.03
installed ht. 1 53/64 to 1 57/64
cam lift was .430
On a 69 b-rb head there were std and hp specs.
free 2.58
closed seat pressure same as above
" " " HP 110 @ 1 55/64
open seat pressure same as above
" " " HP 236 to 256 @ 1 23/64
installed heights same as above.
Cam lift std .425 I and .450 E
HP cam lift .435 I and .458 E
Looking at comps specs I think you should be fine. The 388 open pressure is at 1.200
The one item that bothers me is the inner springs ID at .697. Some guides need to be cut and a special seal used so the spring will not take off the seal. If you have to do that and pay for it buying the right springs may be the best option.
Posted By: NITROUSN
Re: Comp cams 925-16 springs, good choice? - 03/28/11 01:51 AM
That cam has more lift. I would ask some more on what the valve train survives on spring pressure wise. I have run the mopar 509 but I cant remember what springs we used. I do know it was the mp springs recommended for that cam. My valvetrain survived.
Posted By: RapidRobert
Re: Comp cams 925-16 springs, good choice? - 03/28/11 01:55 AM
Nitrousn I owe ya one 