My 82 GMC 2WD budget sort bed conversion

[junkman.]

Well the chassis is together and i started on the engine i found a manufacturing  date on the timing cover
1994  but I'm not sure if its a 6.2L or 6.5L it doesn't say anywhere i do know that its has a one piece rear main seal    how do i tell if its a 6.2 or 6.5

I striped the engine down to long block and replaced all seals and gaskets and repainted it
also shorten my bed floor there's a post in the body section 

thanks JM

[junkman.]

more pics

[junkman.]

update  here's were its now could have the cab on tomorrow
need to modify some of the fuel lines there different LB to SB 
I'll keep plugging away  JM   

[junkman.]

Well here's an update and some pics
Its running and Ive started shorting the bed sides more pics in a day or two  JM

[Grim 82]

Nice work. Did you find a casting number on the block to ID the motor?

[big bear]

love this truck / project. 

[Edahall]

There's hardly any difference between the 6.2 and 6.5.  The 6.5 was just bored out bigger to accept slightly larger pistons.  Have you already put back on the heads?  If your goal is towards good fuel economy, you might consider installing smaller precombustion chambers on the heads.  Most likely, your heads have larger precombustion chambers which is good for power but not for fuel economy.  With smaller precombustion chambers, you'll gain about 6-8 mpg's.  Yes, you'll lose some power but you can get all the power back with a free flowing exhaust system.  I have the smallest precombusion chambers on my 82 Suburban and I'm getting a solid 30 mpg on the freeway.   I also have it geared real high with 3.08 gears and 700r4 transmission to keep the rpm's real low.

[junkman.]

Nice work. Did you find a casting number on the block to ID the motor?

Thanks   not yet now the engines in i can't find them but i found some #'s on the heads 0137567
maybe someone know what heads i have

JM

[junkman.]

Hey thanks for the info  So is the stroke the same on 6.2 and 6.5 engines?
I found casting #'s (0137567) on the heads maybe this can help identifying the top end. I hope there small pre combustion typ.
I'm also running 700R4 and  10 bolt 3:08's peg leg    the guy i got the truck from said he was getting 24 mpg towing two jet ski trailer  on long trips
If i can get 25mpg on the hwy I'd be thrilled

[junkman.]

Well i finished putting one of the bedsides back together the top part of the panel is flat at the seam but the middle is a little low  I'm going to start on the filler tomorrow i hope its not over a 1/8 inch thick

I'll send more pics JM

[Edahall]

Hey thanks for the info  So is the stroke the same on 6.2 and 6.5 engines?
I found casting #'s (0137567) on the heads maybe this can help identifying the top end. I hope there small pre combustion typ.
I'm also running 700R4 and  10 bolt 3:08's peg leg    the guy i got the truck from said he was getting 24 mpg towing two jet ski trailer  on long trips
If i can get 25mpg on the hwy I'd be thrilled

If he got 24 mpg towing two jet ski's, it's got the smaller precombustion chambers.  The engines with the larger precombustion chambers won't get 24 mpg solo.  Sounds like he made have used the old heads with the smaller precombustion chambers on the newer engine block.

The 700R4 and 3:08's will work out great for good fuel economy.

[junkman.]

Hey thanks for the info  So is the stroke the same on 6.2 and 6.5 engines?
I found casting #'s (0137567) on the heads maybe this can help identifying the top end. I hope there small pre combustion typ.
I'm also running 700R4 and  10 bolt 3:08's peg leg    the guy i got the truck from said he was getting 24 mpg towing two jet ski trailer  on long trips
If i can get 25mpg on the hwy I'd be thrilled

If he got 24 mpg towing two jet ski's, it's got the smaller precombustion chambers.  The engines with the larger precombustion chambers won't get 24 mpg solo.  Sounds like he made have used the old heads with the smaller precombustion chambers on the newer engine block.

The 700R4 and 3:08's will work out great for good fuel economy.

I'm not sure if he said witch engine was in the truck. and i know he used the heads that were on the new engine
what mpg is typical with 6.2-6.5 with large pre chambered heads non turbo

[Edahall]

Hey thanks for the info  So is the stroke the same on 6.2 and 6.5 engines?
I found casting #'s (0137567) on the heads maybe this can help identifying the top end. I hope there small pre combustion typ.
I'm also running 700R4 and  10 bolt 3:08's peg leg    the guy i got the truck from said he was getting 24 mpg towing two jet ski trailer  on long trips
If i can get 25mpg on the hwy I'd be thrilled

If he got 24 mpg towing two jet ski's, it's got the smaller precombustion chambers.  The engines with the larger precombustion chambers won't get 24 mpg solo.  Sounds like he made have used the old heads with the smaller precombustion chambers on the newer engine block.

The 700R4 and 3:08's will work out great for good fuel economy.

I'm not sure if he said witch engine was in the truck. and i know he used the heads that were on the new engine
what mpg is typical with 6.2-6.5 with large pre chambered heads non turbo

Typical mileage on a truck like yours with the 6.2/6.5 and large precombustion chambers is around 21 mpg.  This is assuming 1/2 ton, 2 wheel drive, 3.08 gears, 700R4 transmission and no faster than 65 mph on the freeway.  With the smaller precombusion chambers and the same truck, you would see upper 20's (26-30 mpg).  The advantage of the big precombustion chambers is an extra 35 hp but like I said earlier, a lot of that power can be restored with a free flowing exhaust.  Also remember, the trucks that were built during the days of the large precombustions chambers were built when fuel was cheap and when there was a power war between the big 3.  Dodge had come out with the Cummins and Ford had come out with their Powerstroke so Chevy had do something about it.

[junkman.]

Edahall Thanks  did you post you cummins swap for the suburban
also are the casting #'s i found on both heads are these good #'s 0137567

thanks JM

[JohnnyCanuck]

Man that turned out nice, well done so far.