gen 5 or 6
#1
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gen 5 or 6
took the engine apart today,502mag,mpi,1994.do i have a gen5,or6?my other boat has a 454,gen4,1989.in taking apart the 502 today i noticed that the rocker stud is diffrent from the 454.the 502 is a bolt.and the 454 is a stud.will the older style stud fit the 502?and will rocker arms interchange.i have a nice set of harland/sharp alumium rockers.they came off my 454 w/only 20 hrs on them.will they fit the 502?thanks.
#2
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The Gen VI 502 Magnum started in the 1996 Model year for mercruiser anyway. Serial # OF802600 and up. So it's a Gen V.
Last edited by Pismo10; 01-01-2008 at 06:54 PM.
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took the engine apart today,502mag,mpi,1994.do i have a gen5,or6?my other boat has a 454,gen4,1989.in taking apart the 502 today i noticed that the rocker stud is diffrent from the 454.the 502 is a bolt.and the 454 is a stud.will the older style stud fit the 502?and will rocker arms interchange.i have a nice set of harland/sharp alumium rockers.they came off my 454 w/only 20 hrs on them.will they fit the 502?thanks.
#5
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I don't think the same studs will work. if I remeber right, the MK 4 heads use a 7/16 coarse bottom thread, 7/16 top thread.
The Gen V heads use a 3/8 bottom and 7/16 top. You just need to get the studs with a 3/8 bottom and 7/16 top to use your rockers. These are what you need.
http://store.summitracing.com/partde...5&autoview=sku
The Gen V heads use a 3/8 bottom and 7/16 top. You just need to get the studs with a 3/8 bottom and 7/16 top to use your rockers. These are what you need.
http://store.summitracing.com/partde...5&autoview=sku
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gen5
thanks guys for all the help.it is a gen510 bolts on the timming chain cover.and thanks griff about the studs.you are right.anybody know when gm started putting roller cam shafts in the 502,s.mine is a flat tapplet,hyd.also,do you think there will be any h/p gains if i switched to roller rockers.thanks.