That tells you something is not right with your setup...IMO.
Jumpy Clutch
- Thread starter 409 cu.425hp.
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409 cu.425hp.
Member
Thanks Phil, I think we are on the right track. I have had to cut and weld the rod from the z-bar to clutch arm. So there is a problem somewhere just have to find it. Do not think it is through out bearing, it in the linkage somewhere. Hope I'm on the right track. Thanks for the help. Dave
409 cu.425hp.
Member
I agree just have to find it. Thanks Dave
409 cu.425hp.
Member
Cool
View attachment 24310 I always had a "RAM " 3-metallic pad clutch disc W/a Ram pressure plate on my '57 . 6 grand launches and it held up very well.:eek
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Cool picture ! Whats in front of the clutch? Dave
Hi Dave , What I had in front of the clutch was a 1967 327 vette small journal block with a 283 crank ;060 0ver with 5.7 venolia aluminum rods.12.5 jahns pistons.open chambered angle plug heads from the 1973 Chevy power book cast 340292 stainless valves titanium springs and keepers Sig Erson roller cam crane roller lifters and rockers Weiand Tunnel ram with 660 Holleys Accel B.E.I. ignition. also 1969 Vette super T-10 trans 68 Camaro 12 bolt with 5:57s. The motor worked out to approx. 305 ci dynoed at 550 Hp at I think 6,500 rpm This was 1983 when the pic was taken. The car now has the engine pictured on the left in my avatar.
I have a pic of the engine somewhere. I'll post it when I find it.
I was under the impression you raced a 348 big block back in the dayHi Dave , What I had in front of the clutch was a 1967 327 vette small journal block with a 283 crank ;060 0ver with 5.7 venolia aluminum rods.12.5 jahns pistons.open chambered angle plug heads from the 1973 Chevy power book cast 340292 stainless valves titanium springs and keepers Sig Erson roller cam crane roller lifters and rockers Weiand Tunnel ram with 660 Holleys Accel B.E.I. ignition. also 1969 Vette super T-10 trans 68 Camaro 12 bolt with 5:57s. The motor worked out to approx. 305 ci dynoed at 550 Hp at I think 6,500 rpm This was 1983 when the pic was taken. The car now has the engine pictured on the left in my avatar.
Sorry , That's what's in the car now. I always ran a small block with a stick.I was under the impression you raced a 348 big block back in the day
Hi Dave , What I had in front of the clutch was a 1967 327 vette small journal block with a 283 crank ;060 0ver with 5.7 venolia aluminum rods.12.5 jahns pistons.open chambered angle plug heads from the 1973 Chevy power book cast 340292 stainless valves titanium springs and keepers Sig Erson roller cam crane roller lifters and rockers Weiand Tunnel ram with 660 Holleys Accel B.E.I. ignition. also 1969 Vette super T-10 trans 68 Camaro 12 bolt with 5:57s. The motor worked out to approx. 305 ci dynoed at 550 Hp at I think 6,500 rpm This was 1983 when the pic was taken. The car now has the engine pictured on the left in my avatar.
I found the picture of the 305 race motor
I ate a few Centerforce dual friction clutches up in my car in short order. I now have put a Phoenix clutch kit in and so far am very happy. It is a 6 puck ceramic clutch. Aggressive but streetable. Might be a bit much for most people, but they do have other options as well.
Just throwing this out there. Are the arms that come off the Z-bar braced ? I welded braces from the arm to the tube after I noticed one of the arms was flexing when I pressed the clutch. The factory weld had cracked.John is right about the "z" bar, also known as a Bell crank. This Diagram From the Show Cars web sideshows the difference in different "z" bars.
Holy Cow!! Big picture!! You're interested in the two at the bottom. Notice that the vertical arm on the left is shorter on the 409 bar.
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Good suggestion Butch! 
409 cu.425hp.
Member
Ken, Yes there is. They are all different, 61 only, 62-63 only then 64 only, 65-66. That's as far as my book goes. That's another thing I need to check on. I think that I have the right one. Thanks Dave
I had an old Chiltons manual (probably printed in the mid-70's, but I am not even sure where it is now to check) that showed 2 different clutch linkage set-ups for '61. It showed the normal '61 system and then the 2nd design ('62-63) system being on some 1961's. I'm not sure if that is accurate or not, but if so it seems like that would cause some confusion and an added risk of parts mismatch on 61's. Don't guess that would apply to your '63 in anyway, but this seemed like a good place to mention it for reference.
