I heard that chevy small block valve springs will work and are cheaper. Is this truth or fiction?
7MGTE VALVE SPRING ALTERNATIVES
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Doesn't appear to be listed any longer on the comp cams website....
They have a 975-1, 975-12, 975-16
http://www.compperformancegroupstor...reen=CTGY&Store_Code=CC&Category_Code=SPRNGSI
They have a 975-1, 975-12, 975-16
http://www.compperformancegroupstor...reen=CTGY&Store_Code=CC&Category_Code=SPRNGSI
Im running them the only con is they are louder than stock Im running comp cams inner valve springs
Adjuster
Supramania Contributor
You just buy two boxes of 12.......
The 975 spring is the "Inner" spring on a Big Block Chevy setup.
They have seat and open pressure close to the spring rates of the 2JZ stock springs. (So slightly higher than the 7M springs.)
They are a tight fit into the head, but work with all the stock retainers/lifters etc. When you set them side by side, they are taller before they are installed. But they can be compressed more before they coil bind. (So you could run a higher lift cam, and not have any problems on these springs.)
The metal is the latest stuff, and Comp claims it's cleaner than ever, and thus has fewer failures. (Cracked springs.)
I use them, and have had no problems, with a few over-rev moments putting my engine up to 7150rpm at one missed shift. (As reccord by the Eman.)
Based on what most of us have, old 100+ thousand mile springs, or the cost of the new OEM springs being outragous, these for less than 70.00 total are THE BEST DEAL FOR SPRINGS FOR THE 7M. Hands down.
Sure you can spend more with "F-co" springs, locks and other stuff, but if your running the stock ECU/TCCS, why spend that money where it's not ever going to be needed? (If you plan on running your 7M to 7500 or 8000rpm for extended time, then you can spend the extra money, but at less than 7k rpm, these from Comp Cams are excellent upgrades from stock.)
Why do you think Comp sells the 975 in boxes of 12? LOL It's not for any Chevy aplication... They should just market them in boxes of 24... but selling them in boxes of 12 keeps it easy. (They come in a box made for batches of 16 springs, and that can be used on V8 two valve engines...)
The 975 spring is the "Inner" spring on a Big Block Chevy setup.
They have seat and open pressure close to the spring rates of the 2JZ stock springs. (So slightly higher than the 7M springs.)
They are a tight fit into the head, but work with all the stock retainers/lifters etc. When you set them side by side, they are taller before they are installed. But they can be compressed more before they coil bind. (So you could run a higher lift cam, and not have any problems on these springs.)
The metal is the latest stuff, and Comp claims it's cleaner than ever, and thus has fewer failures. (Cracked springs.)
I use them, and have had no problems, with a few over-rev moments putting my engine up to 7150rpm at one missed shift. (As reccord by the Eman.)
Based on what most of us have, old 100+ thousand mile springs, or the cost of the new OEM springs being outragous, these for less than 70.00 total are THE BEST DEAL FOR SPRINGS FOR THE 7M. Hands down.
Sure you can spend more with "F-co" springs, locks and other stuff, but if your running the stock ECU/TCCS, why spend that money where it's not ever going to be needed? (If you plan on running your 7M to 7500 or 8000rpm for extended time, then you can spend the extra money, but at less than 7k rpm, these from Comp Cams are excellent upgrades from stock.)
Why do you think Comp sells the 975 in boxes of 12? LOL It's not for any Chevy aplication... They should just market them in boxes of 24... but selling them in boxes of 12 keeps it easy. (They come in a box made for batches of 16 springs, and that can be used on V8 two valve engines...)
bingo...
I'm running them, and it pulls to redline a lot better... some of the old springs where pretty bad...
I'm running them, and it pulls to redline a lot better... some of the old springs where pretty bad...
If they're slightly larger in diameter they can rub the inside of the buckets and make more noise.
My major concern would be if you break one it's all over for that motor duals will save the motor in that scenario (ask how I know this)
My major concern would be if you break one it's all over for that motor duals will save the motor in that scenario (ask how I know this)
shouldn't matter since we're not interference motors... well it could suck the valve as well...
I think you had a rare occurance IMHO...
I think you had a rare occurance IMHO...
hmmmmm that sucks :rofl:
Did you ever track down the cause? You're the only one I've seen break a valve spring...but that doesn't surprise me...
Did you ever track down the cause? You're the only one I've seen break a valve spring...but that doesn't surprise me...
Sustained 8000+ rpm 
I now have just about all of my engine parts Cryo treated and things looked good on this tear down.
Ferrea say their springs are good to 10K....... (maybe in 10 second bursts)
I now have just about all of my engine parts Cryo treated and things looked good on this tear down.
Ferrea say their springs are good to 10K....... (maybe in 10 second bursts)
CarlosPTR210 said:
Stage 2 yes, stage 3 is pushing the limit on the coil bind. You should only compress a spring to within 80 % of coil bind, the stage 3 BC cam IIRC will coil bind you to about 85-90%. I would use the BC springs for a BC stage3 cam. Regrind cams, and BC stage 2 would be Comp 975's ok
