crane shaft mount rockers
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crane shaft mount rockers
all in a nicely packed box
one cylinder set up
rocker has a polymatrix bearing. no needle bearings means less friction loss.
Rocker stud towers had to be cut down .170" to fit the shaft mount. the holes had to be drilled and tapped to 3/8-16 thread pitch.
You can see where the valve cover wall had to be notched as well to clear the rocker. Also, on the right, you can see where the bolt boss had to be machined down.
stands on head
rockers installed
some close ups of the rockers. will need the 3/4" spacers to raise the valve covers enough to clear.
one cylinder set up
rocker has a polymatrix bearing. no needle bearings means less friction loss.
Rocker stud towers had to be cut down .170" to fit the shaft mount. the holes had to be drilled and tapped to 3/8-16 thread pitch.
You can see where the valve cover wall had to be notched as well to clear the rocker. Also, on the right, you can see where the bolt boss had to be machined down.
stands on head
rockers installed
some close ups of the rockers. will need the 3/4" spacers to raise the valve covers enough to clear.
Last edited by mrr23; 03-14-2007 at 10:00 PM.
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Very nice. Crane has always made high quality parts as the pics show. That is a good bit of modification to the heads though. More work and over the head of your average LS1 owner. Did you have the heads off when modifying?
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Few things to check/suggestions when installing these. Make sure the stand bolt for the exhaust side isn't too long and bottoms out. I suggest heli coils for every stand hole, aluminum threads get week after bolts have been torqued and removed a few times. These are excellent rocker arms but you have to make sure everything is perfect with the install or you will have problems. I know all of this from experience on my car.
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Originally Posted by Ryan02SS
Very nice. Crane has always made high quality parts as the pics show. That is a good bit of modification to the heads though. More work and over the head of your average LS1 owner. Did you have the heads off when modifying?
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Originally Posted by Ryan02SS
Very nice. Crane has always made high quality parts as the pics show. That is a good bit of modification to the heads though. More work and over the head of your average LS1 owner. Did you have the heads off when modifying?
oh yes, they have to be off the car. all the milling and drilling that has to be done dictates so. these aren't a simple bolt on. i still have to get the 3/4" valve cover spacers to finish up.
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Originally Posted by speedracer5532
Few things to check/suggestions when installing these. Make sure the stand bolt for the exhaust side isn't too long and bottoms out. I suggest heli coils for every stand hole, aluminum threads get week after bolts have been torqued and removed a few times. These are excellent rocker arms but you have to make sure everything is perfect with the install or you will have problems. I know all of this from experience on my car.
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I am sure they are kick *** rockers... but in all honesty they don't make much sense. Can they be used on trickflows, ETs?, Darts? If not, they are going to have a VERY small market. I would be hesitant to further weaken ported stock castings by taking material off the rocker bosses. They are already close to compromise as the recent issues with TSP has shown in their previous LS6 offering.
If they can be used with the aftermarket castings, whose going to cut their high dollar heads considerably reducing their resale value just to run a set of shaft mounts that aren't significantly cheaper than other proven shaft mounts?
Crane makes good stuff no doubt. But this endeavor just seems misguided when they did (if any) market research for these.
If they can be used with the aftermarket castings, whose going to cut their high dollar heads considerably reducing their resale value just to run a set of shaft mounts that aren't significantly cheaper than other proven shaft mounts?
Crane makes good stuff no doubt. But this endeavor just seems misguided when they did (if any) market research for these.
#13
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Originally Posted by mr2guru
I am sure they are kick *** rockers... but in all honesty they don't make much sense. Can they be used on trickflows, ETs?, Darts? If not, they are going to have a VERY small market. I would be hesitant to further weaken ported stock castings by taking material off the rocker bosses. They are already close to compromise as the recent issues with TSP has shown in their previous LS6 offering.
If they can be used with the aftermarket castings, whose going to cut their high dollar heads considerably reducing their resale value just to run a set of shaft mounts that aren't significantly cheaper than other proven shaft mounts?
Crane makes good stuff no doubt. But this endeavor just seems misguided when they did (if any) market research for these.
If they can be used with the aftermarket castings, whose going to cut their high dollar heads considerably reducing their resale value just to run a set of shaft mounts that aren't significantly cheaper than other proven shaft mounts?
Crane makes good stuff no doubt. But this endeavor just seems misguided when they did (if any) market research for these.
Mid-lift (Miller) is coming out with LSx rockers soon as well, but they provide a taller rocker boss which is then machined to the head/valve stem dimensions and the cam lift. Again very specific to an application, but their wipe pattern on the valve is extremely narrow and they also maximize lift accelerations in this process.
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Originally Posted by mr2guru
If they can be used with the aftermarket castings, whose going to cut their high dollar heads considerably reducing their resale value just to run a set of shaft mounts that aren't significantly cheaper than other proven shaft mounts?
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Originally Posted by mr2guru
Crane makes good stuff no doubt. But this endeavor just seems misguided when they did (if any) market research for these.
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I looked at Jesels and TD's when I did my heads. All the feedback I had received was that the pushrod holes needed some elongation to eliminate interference and possibly the inner rim of the valve cover surface. I didn't go that route as a result so I don't actually have experience with them and went with Crane stud mounted instead. I really like the stud mounts, but removing them for spring changes is a pain. Full adjustability, especially with the Morel lifters so I can control the lifter preload is a big plus though.