Engine and axle decoding - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RicksTrucks · 08-01-2005, 09:09 PM

I have looked at FAQ and went to sites, but cannot make heads nor tails of what I have.

ENGINE markings passenger side front lip of block

10925WA on one engine (1968)

131161826 K02 12 CKL (1971 but think truck was originally 6 cyl)

AXLE

HA1026 W2 on top on the pasenger side of pumpkin - 70 Longbed

**uncle** · 08-01-2005, 09:13 PM

If it's a 68 it could be a 307, but probably a 283.HA is a 373 single track if it's a 67-72.

**Desert Rat** · 08-01-2005, 09:15 PM

i think WA is a 283 in '67 and 307 in '68
HA 3.73's

some one correct me if I am wrong.

**Desert Rat** · 08-01-2005, 09:18 PM

LOL beat me to it!

RicksTrucks · 08-01-2005, 09:21 PM

Where, on the engine, that would should the actual year since you cannot count on just the truck's year?

And I know 3.73 is better than 4.10 or 4.11, but should a person find something closer to 3.07 to get better gas mileage?

**uncle** · 08-01-2005, 09:44 PM

On the intake or check on the back of the block for the block casting.

Fred T · 08-01-2005, 09:44 PM

Go here for locations
http://www.mortec.com/location.htm

08-01-2005, 09:09 PM	#1
RicksTrucks Senior Member Join Date: Jan 2005 Location: Claremore, OK 74017 Posts: 2,640	Engine and axle decoding I have looked at FAQ and went to sites, but cannot make heads nor tails of what I have. ENGINE markings passenger side front lip of block 10925WA on one engine (1968) 131161826 K02 12 CKL (1971 but think truck was originally 6 cyl) AXLE HA1026 W2 on top on the pasenger side of pumpkin - 70 Longbed __________________ 68 Short Stepside C-10 69 SWB C-10 70 Flatbed C-20 70 LWB C-20 BB402 70 LWB C-10 CST 70 LWB C-10 CST 71 Short Stepside Cheyenne C-10 72 LWB C-10 72 Blazer 4x4 4spd 95 Jeep Cherokee 4x4 Last edited by RicksTrucks; 08-01-2005 at 09:19 PM.

08-01-2005, 09:13 PM	#2
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,288	Code WA If it's a 68 it could be a 307, but probably a 283.HA is a 373 single track if it's a 67-72. Last edited by uncle; 08-01-2005 at 09:14 PM.

08-01-2005, 09:15 PM	#3
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	i think WA is a 283 in '67 and 307 in '68 HA 3.73's some one correct me if I am wrong. Last edited by Desert Rat; 08-01-2005 at 09:17 PM.

08-01-2005, 09:21 PM	#5
RicksTrucks Senior Member Join Date: Jan 2005 Location: Claremore, OK 74017 Posts: 2,640	Where, on the engine, that would should the actual year since you cannot count on just the truck's year? And I know 3.73 is better than 4.10 or 4.11, but should a person find something closer to 3.07 to get better gas mileage? __________________ 68 Short Stepside C-10 69 SWB C-10 70 Flatbed C-20 70 LWB C-20 BB402 70 LWB C-10 CST 70 LWB C-10 CST 71 Short Stepside Cheyenne C-10 72 LWB C-10 72 Blazer 4x4 4spd 95 Jeep Cherokee 4x4

08-01-2005, 09:44 PM	#6
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,288	Codes On the intake or check on the back of the block for the block casting.

08-01-2005, 09:18 PM	#4
Desert Rat Senior Member Join Date: Dec 1999 Location: Darrington, Washington Posts: 3,963	LOL beat me to it!

08-01-2005, 09:44 PM	#7
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Go here for locations http://www.mortec.com/location.htm __________________ Fred There is no such thing as too much cam...just not enough engine.



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