Comp 921 duals or PRC gold duals?
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TECH Junkie
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From: Deerfield Beach, FL
Comp 921 duals or PRC gold duals? Just need to know if the comp 921 are as good as the prc duals and if they'll handle my new cam (246/257 .632/.645 112+4). They are coming on the set of heads that I am buying off a member here on the board and I want to make sure they're good, if not, I can swap my prc kit from my stock heads onto them, cuz I had just replaced the springs about 100 miles or so before pulling the motor for the build-up, so they're basically brand new!!! Let me know what you guys think, thanks!!! 
no, they're terrible and you should swap. then ship the entire 921 kit to me for $100 
921's are some of the best duals out there. why you'd want to swap them out i am not sure.
921's are some of the best duals out there. why you'd want to swap them out i am not sure.
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Originally Posted by cyphur_traq
no, they're terrible and you should swap. then ship the entire 921 kit to me for $100
921's are some of the best duals out there. why you'd want to swap them out i am not sure.
921's are some of the best duals out there. why you'd want to swap them out i am not sure.
I'd like to hear all the good or bad experiences with them guys, keep 'em comin, thanks!
On The Tree
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From: North Palm Beach, FL.
Devon the 921's are two independent pieces, the innner springs slides easily inside the larger spring. This causes a harmonics problem and I've heard that the springs start slapping at high RPM's.
I believe the Crane's inner spring is wound tightly to the outter spring and is more like one piece eliminating this problem.
I believe the Crane's inner spring is wound tightly to the outter spring and is more like one piece eliminating this problem.
Last edited by hoserack; May 15, 2005 at 03:01 PM.
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Originally Posted by PREDATOR-Z
there are many good springs out there but 921's are one of the best duals. Not cheap, but with these you definately get what you pay for.
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Originally Posted by blkZ28spt
921's are better. Another one of the things I'd be running if I wasn't a financially challenged college student on a 5-6 year plan. 
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TECH Junkie
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Originally Posted by hoserack
Devon the 921's are two independent pieces, the innner springs slides easily inside the larger spring. This causes a harmonics problem and I've heard that the springs start slapping at high RPM's.
On The Tree
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From: North Palm Beach, FL.
I was in a shop recently dicussing which duals I was gonna upgrade to.
The guy had every phucen spring that you could think of in there and I beleive he found the Cranes to be working best.
I'll call tomorrow to double check. and call you.
This guys said 921's are **** and and they also lowered the 918 singles to 600 lift so they could sell the more expensive 921'S.
Before the 921's came along the 918's were rated to 650.
The guy had every phucen spring that you could think of in there and I beleive he found the Cranes to be working best.
I'll call tomorrow to double check. and call you.
This guys said 921's are **** and and they also lowered the 918 singles to 600 lift so they could sell the more expensive 921'S.
Before the 921's came along the 918's were rated to 650.
Last edited by hoserack; May 15, 2005 at 03:11 PM.
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From: The South
Originally Posted by Loudmouth LS1
Any truth to this guys? Cuz i'm probably gonna be reving the new motor over 7000 easy!
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Originally Posted by Loudmouth LS1
Any truth to this guys? Cuz i'm probably gonna be reving the new motor over 7000 easy!
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Originally Posted by hoserack
I was in a shop recently dicussing which duals I was gonna upgrade to.
The guy had every phucen spring that you could think of in there and I beleive he found the Cranes to be working best.
I'll call tomorrow to double check. and call you.
This guys said 921's are **** and and they also lowered the 918 singles to 600 lift so they could sell the more expensive 921'S.
Before the 921's came along the 918's were rated to 650.
The guy had every phucen spring that you could think of in there and I beleive he found the Cranes to be working best.
I'll call tomorrow to double check. and call you.
This guys said 921's are **** and and they also lowered the 918 singles to 600 lift so they could sell the more expensive 921'S.
Before the 921's came along the 918's were rated to 650.
Originally Posted by hoserack
Unless these gus are building heads every day for a living I wouldn't make my decision on hearsay.
Question it all you want. If 921's were **** then they wouldn't have a good reputation.
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Originally Posted by blkZ28spt
Over 7,000? That is seriously high, and is asking for a lot out of a hydraulic roller setup. Let alone the bottom end....
I mean obviously I won't know till I get her together and get her on the track and start testing ****, but i'm almost positive she's gonna need to go that high. On The Tree
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From: North Palm Beach, FL.
Originally Posted by Loudmouth LS1
Oh god, tell me ur not tryin to give me advice from Berry!!!! If so, 921's are definately staying!!!
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Originally Posted by hoserack
Put em in Baby, I won't bother making the call.
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From: North Palm Beach, FL.
Originally Posted by Loudmouth LS1
Hey dude, it's no offense to you, but you know my feelings about Berry and I just wouldn't trust a word that guy said!
No I don't know your feelings about Berry.
You don't even know the man.
My motor runs like a ****.
Your making your judgements based on what others have said that proved false.
Berry puts the 921's in if that's what the customer has to have.
He had 3 boxes of them on his shelf.
His comments were based on customer feed back.
I was just trying to be helpful before you put the motor together.
I wish only the best for your project, I know how much you have in it.
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Originally Posted by hoserack
No I don't know your feelings about Berry.
You don't even know the man.
My motor runs like a ****.
Your making your judgements based on what others have said that proved false.
Berry puts the 921's in if that's what the customer has to have.
He had 3 boxes of them on his shelf.
His comments were based on customer feed back.
I was just trying to be helpful before you put the motor together.
I wish only the best for your project, I know how much you have in it.
You don't even know the man.
My motor runs like a ****.
Your making your judgements based on what others have said that proved false.
Berry puts the 921's in if that's what the customer has to have.
He had 3 boxes of them on his shelf.
His comments were based on customer feed back.
I was just trying to be helpful before you put the motor together.
I wish only the best for your project, I know how much you have in it.