One good run and then
#1045140
08/01/11 07:00 PM
08/01/11 07:00 PM
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Joined: Oct 2008
Posts: 492
South Jersey, NJ
DragDart360
OP
mopar
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OP
mopar
Joined: Oct 2008
Posts: 492
South Jersey, NJ
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I bought these for a lesser built engine and thought I could use then on this one WRONG one run then:(  Luckily no major damage to other parts, I will buy a new rocker set not just replace the shaft. What to buy? Hughes, T&D, Other?
70 Dart Swinger, 2850 lbs
SB 408, Bullet roller 264/268 @50 .636 SSDS stage 2 Edelbrock heads, 1 7/8 Headmans, 1050 dominator by Dom, 9.867 @ 133
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Re: One good run and then
[Re: DragDart360]
#1045146
08/01/11 07:46 PM
08/01/11 07:46 PM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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I had it happen to crane gold race rockers and it was because the bolts came loose.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: One good run and then
[Re: Plymouth340]
#1045149
08/01/11 09:19 PM
08/01/11 09:19 PM
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Joined: Oct 2008
Posts: 492
South Jersey, NJ
DragDart360
OP
mopar
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OP
mopar
Joined: Oct 2008
Posts: 492
South Jersey, NJ
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I don't know the open pressure, they are PSI roller springs, the highest RPM was 6500. I followed the link about us cheap Mopar guys after I thought I could use this Chinese stuff. I got lucky and got away with no major damage. The hold downs were Hughes with studs torqued per Hughes recommendation. Nothing I received from PRW was any good, I haven't even got a refund for the damper that didn't fit. Hopefully the flexplate won't shatter on the next run. 
70 Dart Swinger, 2850 lbs
SB 408, Bullet roller 264/268 @50 .636 SSDS stage 2 Edelbrock heads, 1 7/8 Headmans, 1050 dominator by Dom, 9.867 @ 133
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Re: One good run and then
[Re: Plymouth340]
#1045150
08/01/11 09:45 PM
08/01/11 09:45 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
i think when tigthening down rocker shafts with high spring pressure they all flex no mater how carful you are and sooner or later they brake at the weak point..the bolt ..sean it afew times..just my 
On my W-2 heads I turn each nut a 1/4 turn till tight...
takes a while but I never broke a shaft
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Re: One good run and then
[Re: DragDart360]
#1045153
08/01/11 10:53 PM
08/01/11 10:53 PM
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Joined: Nov 2004
Posts: 3,544
Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Those rockers dont belong on any engine with roller cam and springs. They just arent capable or of high enough quality for that. You cant ( sort of) blame the rockers, they were mis-applied sorry to say.
Check your PMs.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: One good run and then
[Re: Plymouth340]
#1045154
08/02/11 05:28 AM
08/02/11 05:28 AM
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Joined: Aug 2004
Posts: 2,128
sweden
sshemi
top fuel
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top fuel
Joined: Aug 2004
Posts: 2,128
sweden
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Quote:
i think when tigthening down rocker shafts with high spring pressure they all flex no mater how carful you are and sooner or later they brake at the weak point..the bolt ..sean it afew times..just my
Had that happen to harland sharps shafts.
Bought some cheap mancini shafts witch seem to hold up fine.
I would think the hold downs came loose.
I know the shfts in the prw kit is good/not any worse than some else
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