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6.5 into 67 C60

N

Nate BB

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Location
Alberta, Canada
I'm currently looking to put my 94 6.5, in a 1967 C60 . the truck originally had a 327, with a Clark 5 speed.. I'd like to keep the 5 speed, and just swap out the engine, because I know bellhousing patterns are the same. My question is can I use the 6.2 flywheel? .. And would the 6.5 starter fit with the older bellhousing? .. Also, the 327 uses the front wishbone style motor mount, does the 6.5 have the bolt holes in front, for the mount, or would I need to fabricate a new mount?.. Any information would be appreciated. Thanks
 
Depending on which 6.2L flywheel, you may be able to use it. I'm not certain, but I think the 6.2 and 6.5L both were balanced the same way. Problem is most 6.2's have a 2 piece rear main seal, and the associated flywheel for it whereas all 6.5's have a 1 piece rear main seal with the smaller bolt pattern to match. Size wise the 6.5L should drop right into most any spot that a small block chevy origanally housed. Your 5 speed may not be up to the torque if you have a turbo, but thats your call on how hard you plan to push it. As to the wishbone mount, I would change that. All of the wishbone mounts I seen wouldn't even clear a large harmonic balancer with some serious grinding to the mounts, not to mention the extra weight and torque you'll be applying. The front bolt holes may match up, but I'm not sure as I've never tried it. As to the starter, the powermaster may work, but I doubt the stock gear reduction would fit. Most 327's used the 153 tooth flywheel, and the small starter nose cone, so both of those would be out for the 6.5L as it only uses the 168 tooth flywheel, and has a rather large nose cone on the starter. Need a few more details, but it sounds like your hurdle will be the bellhousing and starter.
 
Thanks for the response ... I'm just wondering if I did go buy a new flywheel then, would the dual mass flywheel even with the old clutch pack that is on there now ?, or would I need to order that as well?.. Reason I ask is because the clutch in there now is still new .... As for the transmission, I don't foresee a issue with it handling the power simple because it's the same tranny that was used with the 366's, and 427's ... It was originally a old grain truck with a 5 speed, with a 2 speed rear end, but I've swapped out the old diff, for a newer style Eaton setup out of a 92 international moving van with with disc brakes, and 4.88 gears ... Looking at the bellhousing I believe you are right that the starter won't fit... What are the other options for starters that can be used with the 6.5?
 
That looks pretty cool...here is a C60 that someone matched the old pick up bed to...looks good.

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I've seen that one .. There's a few out there with boxes .. I wanted to build one I could use for pulling a gooseneck with, that's why I went with a deck on mine .... They're cool old trucka either way tho
 
I wouldn't run a DMF, instead i would run the single mass replacement. For a starter, if it uses the 153 tooth starter now, you're pretty well outa options except to find a new bellhousing. Pretty sure all 6.2/6.5's were 168 tooth flywheels. The powermaster starter may have a smaller nosecone, but you would still have the fitment issue of the larger flywheel. Need to know what flywheel you have now to say any more.
 
Did some digging, and from what I can find, the bellhousing and starter will be your obstacle. From what I could find, the 5 speeds used a starter that bolted directly to the bellhousing instead of the block like most all GM's did. So if this is how yours is, then you're diving into custom territory to make it work. The starters I could find all said 1.5KW, which is not enough juice to spin over a high compression diesel. The stock 6.5L came with a 2.5KW starter on it with a gear reduction unit built in. Depending on which trans you have, you might be able to find a bellhousing from an 8.2L DETROIT which was a DETROIT DIESEL, but I don't know if it used a standard 90 degree bellhousing pattern or not.
 
Thanks alot, that definitely gives me some digging to do.. That was probably my biggest concern, apart from which flywheel to use .. If it gets to be too much of a headache, I my just keep it gas and run a 454.. Thanks for the information ,much appreciated
 
Just did some more digging. If yours has the 12" clutch now, then that is the same size clutch the 6.5l used. Also the 11" and 12" clutches were supposed to have a 14.25" od flywheel with a 168 tooth ring gear on it. The 6.5l also uses a 14.25" od flywheel, but a 139 tooth ring gear with much thicker teeth for the stronger gear reduction starter. So it sounds like your clutch will bolt up, and the flywheel should clear the bellhousing, but you may have to cut part of the bellhousing out to allow the 6.5l starter to clear and bolt to the block instead of the bellhousing, then have 1/4" thick plating welded back into thebellhousing to close it back off and restrengthen it through that area. It should be well below the stress areas of any engine mounting bolts, so if plated properly, strength shouldnt be an issue. Then your only issue will be does your 5 speed have OD, or is it 1:1 because with 4.88 gears you'll be turning some RPM's going down the road even with those big tires.
 
All these trucks I am familiar with are 1:1, hence the 2 speed axle for OD. The rear ratio's from factory I'm familiar with are 6.27 and 7.27 ratio's. 4.88 will likely work out OK.
 
Thanks, I did wonder about cutting out the bellhousing to make the starter fit ... And the tranny is 1:1 ... But right now with the 4:88 gears, and 10r22.5 tires, at 110 kph , it's at 2200 rpm with this gas engine, there's room to go to 11r22.5's if that's still too high.. But I also have access to 4:56's as well.. So I'm not too concerned with that part of it ... I'll have to do some figuring once I get the gas engine out and see what will work .. I'd like to be able to use this 6.5, just for the sake of doing it ... I'm going to reroute the turbo setup, and try a few modifications, to the intake system to allow for better airflow .. Similar to the military style engines Peninsular is building ... Nothing ventured, nothing gained.... My 6.5 has the high nickel block .. It's got over 550 k on it , no smoke, and minimal blow by... It's as good a candidate as any, for this swap, which is why I'm hoping it will work out ... But thanks for your input guys.. Really appreciate it
 
FWIW, I have a 1970 Chevy 4x4 and GM never put a factory big block in them (about same size as 6.5)
Put a big block in mine, but it required fire wall modification.
I was able to use the motor mount crossover from a 1973-88 from a 4x4.

You may not have these issues in yours though. Did they ever have a big block in the C60?

And one last thing could you use a bell housing off a NV4500? I always thought the 4 bolt mounting flange from trans to bell housing was universal?
 
I know a guy that has the nv4500 bellhousing , I should take some measurements and see ... It looks like there should be plenty of room for a big block .. There is one I just saw that has a 366 in it, and it's a 68.. Also on these the lower portion of the firewall is recessed back, which gives more room as well ... Thanks for the reply
 
Your RPM's sound pretty good right now. Can you get underneath and take a pic of it? It seems there are 2 different style bellhousings for these, and yours sounds to be the oddball. Some used a regular sae round bellhousing, then an adapter that adapts from the round sae to the gm 90 degree pattern, and the starter bolts to this adapter. If this is what you have, then I found a company that makes custom adapter plates to make it work. I know nothing about them other than a few forum posts, but they say they can make it.

http://www.phxgrp.com/index.html
 
I can probably get a picture .. I was under there today and it is a little tough to see.. But I noticed it a standard GM bolt pattern, in the half round shape ( meaning it doesn't appear to extend down underneath and all the way around, like some others) .. It has a dust shield that bolts to the bottom ... The starter does bolt to the bellhousing .... I did some.calling around today, and found that this transmission and engine combination should be running the 13" clutch, and it it has a large input shaft, so I would need to get a clutch pack, as well as a flywheel... The GM NV4500 has the small input shaft, so I'd need to figure out which clutch would work .... The more I talk about it, the more I'm considering just going with a big block gasser , and making life easy on myself haha .. But I'll sleep on that
 
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