Cadillac 500 Rocker Arms Recommendations? [message #259381] |
Tue, 19 August 2014 16:51 |
djeffers
Messages: 219 Registered: June 2004
Karma: 2
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Senior Member |
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We would like recommendations for replacement shaft rocker arm assemblies for our Cadillac
500 engine.
Ideally, the replacement shaft rocker system would:
1: Use off the shelf or easily obtainable pushrods (Cadillac or others)
2: Use off the shelf or easily obtainable rocker arms
3: Be a bolt in replacement
4: and clear the original Cad 500 valve covers.
We realize all these conditions may not be met in any one set.
Please tell us what systems you have used on your Cad 500 engine and why, or any sets that you think are good replacement systems.
After having seen that a couple of forum members have broken a Cad 500 rocker arm stand on
the road, popped a lifter and lost oil pressure with very inconvenient results; we would like to make the rocker arm change now.
All suggestions greatly appreciated.
Best regards,
Don and Susan Jeffers
78 Eleganza II Cad 500
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Re: Cadillac 500 Rocker Arms Recommendations? [message #259389 is a reply to message #259381] |
Tue, 19 August 2014 18:16 |
Larry
Messages: 2875 Registered: January 2004 Location: Menomonie, WI
Karma: 10
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Senior Member |
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djeffers wrote on Tue, 19 August 2014 16:51We would like recommendations for replacement shaft rocker arm assemblies for our Cadillac
500 engine.
Ideally, the replacement shaft rocker system would:
1: Use off the shelf or easily obtainable pushrods (Cadillac or others)
2: Use off the shelf or easily obtainable rocker arms
3: Be a bolt in replacement
4: and clear the original Cad 500 valve covers.
We realize all these conditions may not be met in any one set.
Please tell us what systems you have used on your Cad 500 engine and why, or any sets that you think are good replacement systems.
After having seen that a couple of forum members have broken a Cad 500 rocker arm stand on
the road, popped a lifter and lost oil pressure with very inconvenient results; we would like to make the rocker arm change now.
All suggestions greatly appreciated.
Best regards,
Don and Susan Jeffers
78 Eleganza II Cad 500
Not sure what Cad Co has, but here is the URL for MTS and their Rocker sets.
http://www.mtscadparts.net/servlet/Categories
I bought the MTS Roller Tipped Shaft Rocker system, NON-Adjustable, full support - 1.70 ratio.
Don't know yet how it is going to work out as it was shipped to me yesterday.
1: Use off the shelf or easily obtainable pushrods (Cadillac or others)
Uses their Pushrods designed for this rocker set off of their shelf NOT standard cadillac.
2: Use off the shelf or easily obtainable rocker arms
Comes as a complete set of rockers designed and built for MTS.
3: Be a bolt in replacement
Bolt on replacement
4: and clear the original Cad 500 valve covers.
Does not cleat original covers. Had to buy chrome covers that will clear the rockers.
JWID
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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Re: Cadillac 500 Rocker Arms Recommendations? [message #259997 is a reply to message #259381] |
Mon, 25 August 2014 08:31 |
djeffers
Messages: 219 Registered: June 2004
Karma: 2
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Senior Member |
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Thanks Larry, and Jim K too in another thread.
I did contact Ken H. and he pointed out his system required the vendor's 1/4" thick valve cover gaskets for rocker clearance.
That is the kind of detail I would like to hear about. You can't usually get those minor details in the vendor's short write-ups in their catalogs.
Don
[Updated on: Mon, 25 August 2014 08:33] Report message to a moderator
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Re: Cadillac 500 Rocker Arms Recommendations? [message #260008 is a reply to message #259997] |
Mon, 25 August 2014 10:07 |
Larry
Messages: 2875 Registered: January 2004 Location: Menomonie, WI
Karma: 10
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Senior Member |
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djeffers wrote on Mon, 25 August 2014 08:31Thanks Larry, and Jim K too in another thread.
I did contact Ken H. and he pointed out his system required the vendor's 1/4" thick valve cover gaskets for rocker clearance.
That is the kind of detail I would like to hear about. You can't usually get those minor details in the vendor's short write-ups in their catalogs.
Don
Don,
The rockers may or may not clear the rocker cover depending on what cam you have. Just to be on the safe side, place the gasket and valve cover in place. Then pull the coil wire or somehow disable ignition so it will not start. Then turn the motor over with your hand on the covers. If the rockers are hitting the valve cover, you will feel it. If they do not hit the inside of the cover, I would tighten the cover bolts, and start the motor....being prepared to shut off immediately if you hear the rockers hitting. Tightening the cover bolts will carry the cover closer to the rockers...maybe close enough to hit. Just what I'd do....
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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Re: [GMCnet] Cadillac 500 Rocker Arms Recommendations? [message #260099 is a reply to message #260008] |
Tue, 26 August 2014 00:15 |
jimk
Messages: 6734 Registered: July 2006 Location: Belmont, CA
Karma: 9
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Senior Member |
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Putting on double gasket is not a good practice on vehicles that travel
thousand miles.
I told you that you only need the ones that fit under the standard covers.
I should know as I have more miles on Cad motors with the tube rockers than
all.
I know it is a free world, but hate to have people on side of the road with
oil leaks from the valve gaskets.
It is not as bad as having studs holding the head than bolts.
In other words, I cannot say too much about what is good to do or not.
I know few racers that use it on the drag stip, but it is 1/4 of a mile.
On Mon, Aug 25, 2014 at 8:07 AM, Larry wrote:
> djeffers wrote on Mon, 25 August 2014 08:31
>> Thanks Larry, and Jim K too in another thread.
>>
>> I did contact Ken H. and he pointed out his system required the vendor's
> 1/4" thick valve cover gaskets for rocker clearance.
>>
>> That is the kind of detail I would like to hear about. You can't usually
> get those minor details in the vendor's short write-ups in their
>> catalogs.
>>
>> Don
>
> Don,
> The rockers may or may not clear the rocker cover depending on what cam
> you have. Just to be on the safe side, place the gasket and valve cover in
> place. Then pull the coil wire or somehow disable ignition so it will not
> start. Then turn the motor over with your hand on the covers. If the rockers
> are hitting the valve cover, you will feel it. If they do not hit the
> inside of the cover, I would tighten the cover bolts, and start the
> motor....being prepared to shut off immediately if you hear the rockers
> hitting. Tightening the cover bolts will carry the cover closer to the
> rockers...maybe close enough to hit. Just what I'd do....
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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