mikerussell Posted October 19, 2012 Report Share Posted October 19, 2012 Bit of a strange one, recently i have encountered a problem with my long stroke GM. No good at mechanics so please excuse my ignorance. Take the top engine cover off, under that the rocker bridge ally thing has cracked in the middle, I am reluctant to get it repaired as it has previously done, but when i spoke to dealers they have advised that this ally bridge is machined for that head etc and replacement part cannot be ordered individually, hence why it has been repaired previously. My question, is there anyone who has a Long stroke GM motor maybe damaged to valves etc that could sell me this bridge, i cannot afford a new head!! but i am desperate to get the old gal going. My new short stroke motor is for sale to purchase a long stroker pics available if interested in swap etc!! Any help on this matter would be very much appreciated as i have a meeting at lynn next sunday, and the short stroke motor is too quick for me!!! Regards, Jack Quote Link to comment Share on other sites More sharing options...
gazzatopfuel Posted October 21, 2012 Report Share Posted October 21, 2012 i had same problem, trevor hedge was very helpfull, they are actualy line bored with head but you can with paitence! hone/file oversize bridge to do job otherwise specialist engineering job! Quote Link to comment Share on other sites More sharing options...
speedflash Posted December 10, 2012 Report Share Posted December 10, 2012 Not always. I have 6 or 7 that your welcome to try and see if they fit. The problem is that if your head has a X,X3,X5 cam the rockers are different center's to a head that takes a P cam. If I can help I will. 07711159044 Quote Link to comment Share on other sites More sharing options...
gkp413 Posted December 11, 2012 Report Share Posted December 11, 2012 Glyn, you don't have any Jawa rocker bridges? Looking for one for the 90mm engine where the barrel bolts to the cases and then the head to the barrel, it's different! Thanks, Gary Quote Link to comment Share on other sites More sharing options...
speedflash Posted December 11, 2012 Report Share Posted December 11, 2012 Hi Gary, Its not. All Jawa rocker bridges are the same. The rockers are either in bushes or bearings.The bridges are the same I think. I do have some both the front 2bolts and the rear. Give me a call 07711159044 Quote Link to comment Share on other sites More sharing options...
gkp413 Posted December 11, 2012 Report Share Posted December 11, 2012 Glyn, will give you a call later when I get chance. It's the 4 bolt rear, on this engine the rockers are in bushes but the bushes have a circlip around them to retain which means the head and bridge has a grove to locate, the early ones with bushes had no retaining groove but held by a "notch" in the bush and a locating hole in the head and bridge and the bolt spacing is different. The later JRM had bearings with half washers at either end to locate and the head and bridge has 2 groves machined in to retain. So I think there are 3 styles of bridge, older one with a location hole, latest with twin groves to hold the bearings in and the one I am after which is the single groove. Gary Quote Link to comment Share on other sites More sharing options...
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