MKIII 6m block swap

supraman8188 · 09-18-2011, 06:11 AM

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?

btwilson86 · 09-18-2011, 07:36 AM

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

87hilux7mge · 09-22-2011, 05:59 AM

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.

btwilson86 · 09-22-2011, 06:21 AM

Quote:

Originally Posted by 87hilux7mge

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.

87hilux7mge · 09-22-2011, 06:29 AM

i was gonna say..."mmmm....i wanna see the 5mge's uve seen!" haha

Ranma · 09-23-2011, 06:52 PM

Quote:

Originally Posted by supraman8188

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.

supraman8188 · 09-24-2011, 03:44 PM

Thanks all for the good input.

09-18-2011, 06:11 AM	#1
supraman8188 Stock Join Date: Apr 2008 Location: DSM, IA Posts: 25	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? __________________ Supe supe! 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.

09-18-2011, 07:36 AM	#2
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	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 __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

09-22-2011, 05:59 AM	#3
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	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. __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

09-22-2011, 06:29 AM	#5
87hilux7mge walbro fp Join Date: Dec 2010 Location: spokane Posts: 479	i was gonna say..."mmmm....i wanna see the 5mge's uve seen!" haha __________________ 87 toyota 4x4 single cab short box pickup, 7MGZE.

09-24-2011, 03:44 PM	#7
supraman8188 Stock Join Date: Apr 2008 Location: DSM, IA Posts: 25	Thanks all for the good input. __________________ Supe supe! 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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