6g72 DOHC in a Dodge Spiirt?

[the_flash083]

Will this basicly bolt right in, just need a ecu? seeing that they are the same block and all?

[Boogieman142]

search the forums...thats all i have to say.

[xtrempickup]

there is one that was just bolted in recently. not an easy task to get running

[Shadow24V]

+1 on search, i think there were 2 threads on this topic recently, heres one:
3/S Head Swap

in a nutshell:
bolt in? yes and no, some fabbing needed for newer mounts. DOHC will probably run into space constraints. Wider heads and all.

ECU? unless you want to try wiring in a $500 J/Y ECU that is OBD-II a SA-ECU is the best way to go, such as Megasquirt. (no idea if the stock 3.0 comp can handle the fuelling needed etc)

[moparmut]

The head bolt holes are the same, but have you place the 12v head gasket over the 24v head. they don't match up. 12v blocks have the oil supply in between the the cylinders and the 24v oil feed in front of the cylinders. the lower plenum is smaller. however it looks like to me that you can block off the oil galleys like the hybrids and run an oil line to the head. there's little allen wrench screws on all the corners of the head you should be able to use. now for the distributor duno, I'm still trying to figure that one out.

[Ondonti]

Quote:

Originally Posted by moparmut The head bolt holes are the same, but have you place the 12v head gasket over the 24v head. they don't match up. 12v blocks have the oil supply in between the the cylinders and the 24v oil feed in front of the cylinders. the lower plenum is smaller. however it looks like to me that you can block off the oil galleys like the hybrids and run an oil line to the head. there's little allen wrench screws on all the corners of the head you should be able to use. now for the distributor duno, I'm still trying to figure that one out.

False information

[Shadow24V]

IIRC there are only MINOR differences between the 24v and the 12v heads oil/coolant passages. over on the TM forum, dodgeshadowchik just got a 24v motor and will check the mating to the 12v (last i knew). THEORETICALLY you could put the 24v heads on the 12v block (with 4v relief pistons). i just used the whole 2000+ SOHC 24v motor

[Ondonti]

That passage was TOTALLY wrong though.
Im using a dohc headgasket on a 12v.

[speedyshelby16]

I thought the block where cast different for the timing belt.

[Shadow24V]

the tensioner is in a slightly different spot due to the different PS pump, but i think the cam gears and crank gear are the same. il have to see if the timing belts are the same length/teeth etc. block cast is 95% the same, mnor differences being oil pan/ PS/alt and assorted other small things. head bolts, tranny bolts etc are pretty much the same as the 12v

[moparmut]

I guess the head gasket off my 93 daytona, and my 95 3000gt heads are wrong then. but the oil passages dont look link the line up to me. they are only 3" away from each other.

[moparmut]

I think i know what the problem is. the only block change was in the 6g72 TT models. OIL PASSAGES!!! Per dodge forum and allpar.com. that's what my head are from. but on the other hand if anyone want to install a 24sohc from a 6g73 tearstone.com makes stage 1,2,3 cams for only $850.00. any how, how did you get the ignition to work.

[Ondonti]

Quote:

Originally Posted by moparmut I guess the head gasket off my 93 daytona, and my 95 3000gt heads are wrong then. but the oil passages dont look link the line up to me. they are only 3" away from each other.

Okay they dont make a non TT cometic headgasket and thats what Im using so you still have something wrong.

Oil passages are different at the OIL PUMP there are pictures of that

[m90daytona]

Quote:

Originally Posted by Shadow24V the tensioner is in a slightly different spot due to the different PS pump, but i think the cam gears and crank gear are the same. il have to see if the timing belts are the same length/teeth etc. block cast is 95% the same, mnor differences being oil pan/ PS/alt and assorted other small things. head bolts, tranny bolts etc are pretty much the same as the 12v

the crank is identical in appearance and so is the plate that goes on the pulley side that houses the front main seal. so even if the sprocket was wrong it could be swapped. i doubt that the timing belts are the same...diffrent tensioners, cams, valves and timing. though i've been wrong before.

have we decided that you cant put the dohc heads on the sohc block?

[dodgeshadowchik]

pretty much. i think if you want to do a swap like that it's best to just swap the entire engine in. maybe...