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I-6 Engines For GMCs that came with the Inline 6 Engines |
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#11
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Re: Blown head gasket vs. cracked block
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#12
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Re: Blown head gasket vs. cracked block
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Because of the transmission input shaft and flywheel, the crank cannot be pulled without removing the engine first. Lifting the engine out is very simple and makes it very very easy to do the engine work. You just have a few wires and hoses, engine mount bolts, trans bolts, exhaust pipe and lift it out with a rented or borrowed hoist. You could get a full engine kit but if this is a real budget build I would inspect & measure your pistons/cam/crank first to see if they are too far gone. If you are getting an engine kit with pistons go to 10 - 30 thou oversize and bore the cylinders. The machine shop will tell you how big you need to go. Now you are talking going full tilt rebuild for more $$$ and if this is not the original engine it just makes sense at this point now to look into the cost of a good quality used 6cyl of any year or buy yourself a an already built long block, see if you can save any $$$ and time. |
#13
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Re: Blown head gasket vs. cracked block
before you do all that just change the 20.00 head gasket and see if it fixes it. if it dont fix it buy a new motor v6 for 200.00.
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#14
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Re: Blown head gasket vs. cracked block
Vern,
As far as originality, it's a moot point....right..? If you really feel like you want a project, then I would pull it and put it on a stand, take it down to the block.....find a good machine shop that understands what your intentions are and have a good time doing something new. It's a hoot if you're not under any time constraints or other "pressures". BUT.....if you were to call around and do some price and availability checking, you might surprise yourself. I don't know if you can still buy a Mr. Goodwrench Crate motor....(long or short block)....but I'm sure someone on here will pipe up and let us know. Both options are enjoyable, and even if it's the first time on an engine swap for you, you couldn't hope to find a more simple project than a GM I-6 in a mid sixties pick-up to cut yer teeth on. |
#15
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Re: Blown head gasket vs. cracked block
Best Way I know is to tear it down. I did one today, a small block V8 and it had; a blown head gasket, a cracked block, bad piston, and spun bearing. This was because they overheated it and ran it out of oil.
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Links to Other Places: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. on FacePage. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. . the To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. on FacePage. Owner of: 1965 GMC 3500 Custom Rescue Squad {Black Built Bodies} 1968 Ford Galaxie 500 Convertible 2006 Yamaha Rhino 450 2008 GMC HHR Panel. |
#16
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Re: Blown head gasket vs. cracked block
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#17
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Re: Blown head gasket vs. cracked block
Now that is what you call having a bad day!
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#18
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Re: Blown head gasket vs. cracked block
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Just replacing a head gasket wouldn't change the compression and MIGHT solve your problem. Done that a lot of times too but it was usually obvious coolant was getting in a cylinder or leaking on the outside. It is definitely possible that the head gasket won't help. Just depends more about how much time you have to mess with it, not super expensive to try it. Oh yeah, had to hit "edit"! I have no idea why you were told that the drive shaft needs machining while doing this work!!??? DAC
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Doug Crawford Rapid City, SD 1970 GMC K5 Jimmy Mom drove 30 years 1972 GMC C2500 owned since 1979 1955 GMC 100 driver-project 2006 GMC Yukon Denali---wife's truck Hope to have a '60 GMC Suburban again someday |
#19
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Re: Blown head gasket vs. cracked block
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"driveshaft" was a typo for "crank shaft". The thought being that you should replace the bearings on the pistons, but not on an old crankshaft. |
#20
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Re: Blown head gasket vs. cracked block
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A used crank doesn't always mean it has to be turned either. In 1986 I built a 350 with a used, un-machined crank, new standard size bearings on mains and rods. I did check clearances and they were on the loose side of acceptable. Long story short, that engine is still running in my '72 GMC. It is getting tired again but it's only been 28 years! DAC
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Doug Crawford Rapid City, SD 1970 GMC K5 Jimmy Mom drove 30 years 1972 GMC C2500 owned since 1979 1955 GMC 100 driver-project 2006 GMC Yukon Denali---wife's truck Hope to have a '60 GMC Suburban again someday |
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