Anyone able to get the Comp adjst shaft rockers to work.?....
#1
Anyone able to get the Comp adjst shaft rockers to work.?....
...or am I just stupid??
I picked up a set (stock 1.7 adjustable)of these from Speed Inc. along with a ported oil pump. I was under the impression these were a direct swap for the stock pieces. However I went to install these the other day. I bolted the pedestals down no problem. The rocker shafts however were at least 1/2 inch away from being seated (in the pedestal) by the time the rockers made contact with the valves and pushrods . The adjusters were backed all the way up. Any further tightening down of the shafts would leave both I & E valves wide open.
This was done on the #1 cyl at TDC. I moved around to different valves but no luck.
Also the geometry of the pushrod into the rocker cup left it off-center of the pushrod hole in the head. The pushrod was actually resting on the edge of the hole regardless if the rocker shafts were seated all the way or not.
I ended up putting the stock ones back in (w/no problem) to get the motor up and running again.
Am I missing some fine print somewhere? Any help would be greatly appreciated. Thanks.
I picked up a set (stock 1.7 adjustable)of these from Speed Inc. along with a ported oil pump. I was under the impression these were a direct swap for the stock pieces. However I went to install these the other day. I bolted the pedestals down no problem. The rocker shafts however were at least 1/2 inch away from being seated (in the pedestal) by the time the rockers made contact with the valves and pushrods . The adjusters were backed all the way up. Any further tightening down of the shafts would leave both I & E valves wide open.
This was done on the #1 cyl at TDC. I moved around to different valves but no luck.
Also the geometry of the pushrod into the rocker cup left it off-center of the pushrod hole in the head. The pushrod was actually resting on the edge of the hole regardless if the rocker shafts were seated all the way or not.
I ended up putting the stock ones back in (w/no problem) to get the motor up and running again.
Am I missing some fine print somewhere? Any help would be greatly appreciated. Thanks.
#2
Your not stupid. These are not a drop in rocker. The pushrods are going to need to be a different length (shorter). The pushrod hole will need to be elongated towards the exhaust side as you indicated. I have a set of these on my motor. It takes having a little patients and the heads off the motor so you can clearance them as they need it. You may also find you need a taller valve cover or spacers. I have spacers. Good luck.
Chris
Chris
#4
Originally Posted by 2000RATA
Your not stupid. These are not a drop in rocker. The pushrods are going to need to be a different length (shorter). The pushrod hole will need to be elongated towards the exhaust side as you indicated. I have a set of these on my motor. It takes having a little patients and the heads off the motor so you can clearance them as they need it. You may also find you need a taller valve cover or spacers. I have spacers. Good luck.
Chris
Chris
Thanks for the reply Chris. That sucks. I wish I had known that while I had the heads off and before ordering the 7.400" pushrods. Thats what I get for not thoroughly researching them before buying. I was just sold on their claim of fitting under the stock valve covers that I assumed they were direct bolt-ins like the other shaft systems. I guess Comp had to make up that height difference somewhere.
It would just be nice if the sponsers sites who carry these, put some fine print next to them explaining the necessary modifications. Something like how they mention the need for machining on some dual valve spring setups.
I guess I'll just sit on them until I pull the heads again for 1 reason or another.
It's just a big chunk of change doing nothing in the meantime though
#5
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This has been covered...Phil on here had the same results. These sound no different than how the T&D shaft rockers are...
http://forums.corvetteforum.com/zerothread?id=680673
Its a shame the company said they'd fit under stock valve covers...
http://forums.corvetteforum.com/zerothread?id=680673
Its a shame the company said they'd fit under stock valve covers...
#6
7 Second Club
iTrader: (11)
Well lets see.
1) They won't fit under stock valve covers
2) They won't fit under stock valve covers with the baffle's removed
3) They won't fit under the stock valve covers with with baffle's removed and bolt dimples ground out.
I am lost, they dont fit under the stock valve covers or modded stockers. I was debating about making some spacers tomorrow morning but I think I am done with DRE.
Phillip
1) They won't fit under stock valve covers
2) They won't fit under stock valve covers with the baffle's removed
3) They won't fit under the stock valve covers with with baffle's removed and bolt dimples ground out.
I am lost, they dont fit under the stock valve covers or modded stockers. I was debating about making some spacers tomorrow morning but I think I am done with DRE.
Phillip
#7
Why don't you just send the shaft rockers back and get a set of good high performance roller rockers? They are bolt-ons and you get similar performance results, without having to pull your heads back off.
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#9
I'd recommend the Crane gold aluminum rockers. I live in Daytona, so Crane is an obvious choice because they have excellent quality and if I have any problems I can go and talk to their tech support guys and get help.
But any of the other valvetrain companies could work well too. The thing you have to watch out for is that some of the aftermarket rockers are "over-built". This means that while they're advertised as being a certain ratio, say 1.8 for example, they could actually be a 1.86 ratio rocker. When putting aftermarket rockers on you need to check your retainer to guide and retainer to valve seal clearance.
I've never had any trouble with the Crane rockers myself, nor have my buddies, but that doesn't mean there isn't something as good out there.
For the spring pressure you run normally in an LS-1, even with performance springs, there really isn't a need for shaft mount rocker arms. Shaft mounts really give you benefits when you're running high open pressures (500-600 lbs.) For the spring pressures run in an LS-1 style V-8, a regular performance roller rocker is the best way to go.
But any of the other valvetrain companies could work well too. The thing you have to watch out for is that some of the aftermarket rockers are "over-built". This means that while they're advertised as being a certain ratio, say 1.8 for example, they could actually be a 1.86 ratio rocker. When putting aftermarket rockers on you need to check your retainer to guide and retainer to valve seal clearance.
I've never had any trouble with the Crane rockers myself, nor have my buddies, but that doesn't mean there isn't something as good out there.
For the spring pressure you run normally in an LS-1, even with performance springs, there really isn't a need for shaft mount rocker arms. Shaft mounts really give you benefits when you're running high open pressures (500-600 lbs.) For the spring pressures run in an LS-1 style V-8, a regular performance roller rocker is the best way to go.
#10
comp is working on a set of shaft rockers that WILL fit under the stock valve covers..but they are 4-6 weeks away from having them..I would just go with the pro magnums
#11
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iTrader: (11)
Originally Posted by spectacle solutions
comp is working on a set of shaft rockers that WILL fit under the stock valve covers..but they are 4-6 weeks away from having them..I would just go with the pro magnums
Phillip