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Old 09-18-2011, 06:11 AM   #1
supraman8188
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Question MKIII 6m block swap

My 7m has bad rings..so I came across a 6m with new pistons and rings. Can I just swap the block and put my 7m head on and be good to go?
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Old 09-18-2011, 07:36 AM   #2
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Someone correct me if I'm wrong, but I believe a 6MGE is essentially an early 7M block/rotating assembly with a late 5M cylinder head/efi.

I know bore and stroke are the same 6M and 7M, can't confirm the compression ratio will be though.

I believe it should work as a replacement with mild modification, may need to change stuff like the timing gear on the crank of the 6M, dunno for sure though
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Old 09-22-2011, 05:59 AM   #3
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as far as my research has gone, the 6m lower end is the same as the 7m. couldnt find info on the timing setup. the pistons are definitely different, but couldnt find the comp ratio either.

i know all the parts for my jdm 7m had 6m stamped on them (rods, crank) so id say aside from the pistons, youd prolly be solid.
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Old 09-22-2011, 06:21 AM   #4
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Quote:
Originally Posted by 87hilux7mge View Post
as far as my research has gone, the 6m lower end is the same as the 7m. couldnt find info on the timing setup. the pistons are definitely different, but couldnt find the comp ratio either.
Yeah, that's pretty much what I came up with. Only reason I bring up the crank timing gear is because I'm fairly certain the 5M uses a timing chain and not a belt.


EDIT: Turns out the 5ME uses a chain, 5MGE uses a belt. So the 6M bottom end is probably good to go without modification.
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Old 09-22-2011, 06:29 AM   #5
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i was gonna say..."mmmm....i wanna see the 5mge's uve seen!" haha
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Old 09-23-2011, 06:52 PM   #6
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Quote:
Originally Posted by supraman8188 View Post
My 7m has bad rings..so I came across a 6m with new pistons and rings. Can I just swap the block and put my 7m head on and be good to go?
It will be a whole lot easier to repair your 7m block. Most of the people problems on this forum is by trying to save a few bucks that costs them hundreds in the end.
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Old 09-24-2011, 03:44 PM   #7
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Thanks all for the good input.
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1986.5 Supra Manual Red Mica(Maroon) w/wing: Custom sound system, 18" Tork Revos, smoked tail lights, markers, and turn signals.

Mods: Eibach lowering springs, Energy poly front upper and lower control arm bushings, custom cold air intake, solid engine mounts, Magnaflow, short shifter, Optima Red Top, other custom fabrications..and yes a bra.
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