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Re: Hughes rocker shaft hold down set questio.
[Re: Cab_Burge]
#687940
05/04/10 03:18 PM
05/04/10 03:18 PM
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Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
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Quote:
Quote:
I like the spacers better than the springs , just have the spacers machined down , you want a max of .010 clearance between the rockers and the spacer to the holdown .
.010 may work good on ductile iron or stainless rockers, Harland Sharp and T&D want .015 minimum cold  I like more than that just to be safe on aluminum rockers 
Good point Cab , he doesn't mention what rockers he is running
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Re: Hughes rocker shaft hold down set questio.
[Re: deaks]
#687942
05/04/10 06:06 PM
05/04/10 06:06 PM
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Joined: Feb 2007
Posts: 5,080
organ
maximum entropy
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master
Joined: Feb 2007
Posts: 5,080
organ
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if they are like harland's, no shimming is necessary (other than the hardened spacers). the harland hold downs have enough play in the bolt holes to allow moving them side to side slightly. i pull the shaft down just snugging the bolts, and back off the valve adjusters all the way (keep the ball protruding so the pushrod doesn't contact the rocker). torque the center hold down. turn the engine until a pair of rockers next to the center hold down are both loose, insert your feeler gauge, and torque the next hold down out to "set" the side clearance. turn the engine for the next pair and work your way out. i suspect that will work for the hughes rockers as well.
for what is the good life if not doing things thoughtfully?
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Re: Hughes rocker shaft hold down set questio.
[Re: deaks]
#687946
05/04/10 08:53 PM
05/04/10 08:53 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
The rocker tip is only half on the valve
Iskys? They are made to wide & need to be narrowed to work properly.... I set up a clamp for my buddies lathe that allowed me to cut down a set quick & easy...I intentionally cut the rocckers a little to thin so I could shim them just how I wanted them...
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Re: Hughes rocker shaft hold down set questio.
[Re: fourgearsavoy]
#687948
05/04/10 09:03 PM
05/04/10 09:03 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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Quote:
I had to get my Iskys trimmed down quite a bit by Gary at RAS when I used the Hugh's holddowns.
Gus 
I've got a couple sets I want to send in & have bushed but I figure anything I can do myself that is done correctly is one more thing I don't need to pay someone else for...
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Re: Hughes rocker shaft hold down set questio.
[Re: 1_WILD_RT]
#687949
05/05/10 05:59 PM
05/05/10 05:59 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
OP
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OP
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Joined: May 2004
Posts: 3,210
robin hood country
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I will get them machined later, i've a lot to do and hope to have the car out by the end of the month.
Thanks for the ideas though.
Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: Hughes rocker shaft hold down set questio.
[Re: deaks]
#687950
05/06/10 12:24 PM
05/06/10 12:24 PM
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Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,095
A Banana Republic near you.
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Quote:
I will get them machined later, i've a lot to do and hope to have the car out by the end of the month.
Thanks for the ideas though.
Mick
If you have original Isky's the paperwork that comes with them tells to modify the stock hold downs, the Hughes/RAS holdowns are the same width as stock holddowns .
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Re: Hughes rocker shaft hold down set questio.
[Re: 440Jim]
#687954
05/18/10 09:44 PM
05/18/10 09:44 PM
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Joined: Jan 2004
Posts: 3,838
Central Missouri Fort Leonard...
mopar65
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master
Joined: Jan 2004
Posts: 3,838
Central Missouri Fort Leonard...
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Boy i am glad i found this post. I have a 440 that i just started mocking up to night. I have a set of Indy EZ heads and a comp solid roller that is 264 @ 0.50 and 634 lift with my crane 1.6 roller rockers.I am also using the hughes rocker hold downs.I am using the spring spacers that came with the rockers. but most of my rockers do not line up with the valve tips now.I know i am going to have to Grind on the hold downs. But would it be better to just have .010-0.020 machined off each side of the hold downs and then just shim the rockers back up to wear they are right now? OK next question i screwed all my rocker shaft hold down studs on my heads by hand.with the spacers on the shaft and with the rocker shaft studs tightened down. it looks like all my studs are going to be to short. the instructions that cam with the kit said they are set right when the top of the stud is even with the top of the nut.well most of mine are not like that. so looks like i am going to have to get longer studs. who else makes rocker shaft hold down studs.OK last question. with my comp solid cam should i swap out the crane spacer springs to solid ones? Thanks Mopar65
3520 pound race ready 1973 Street/Strip Dodge Dart - Stock stroke 440/727
10.49 @ 125.0 on 93 pump gas & ET Street Radials. More to come...
( SGT Miller) Proudly served 12 years in the US ARMY RESERVES
support our troops
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Re: Hughes rocker shaft hold down set questio.
[Re: ahy]
#687956
05/18/10 11:39 PM
05/18/10 11:39 PM
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Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
Hemi Allstate
master
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master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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FWIW I used the Hughes hold down set with the comp rockers. We machined the hold downs and used shims to position the Pro Magnum rockers over the valves and to maintain clearence.
Mark
1996 Ram 1500 Sport
1968 road runner
1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Hughes rocker shaft hold down set questio.
[Re: Hemi Allstate]
#687957
05/19/10 10:01 PM
05/19/10 10:01 PM
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Joined: Aug 2009
Posts: 2,054
Mooresburg, Tn
'72CudaRacer
top fuel
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top fuel
Joined: Aug 2009
Posts: 2,054
Mooresburg, Tn
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Only draw back to centering the tips perfectly on the valve stem is you often wind up with push rods hitting the intake ports. Sometimes you have to come to an acceptable middle ground. I also had to machine down the hughes hold downs.
Brian
Last edited by '72CudaRacer; 05/19/10 10:02 PM.
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