mystery engine 250, 292? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67Dad · 11-28-2010, 01:46 AM

Hi All:

In our project, the SPID on the truck (1967) says it has a 292 inline 6. It DOES have an inline 6. After taking it apart, engine cylinders (measured with a regular dial caliper) measure 3.915 diameter. Stroke 3.5 +/- (sort of measured from cylinder wear marks,etc. not a great measurement yet, and crank is already off), which would go along with this being a later year 250 bored out .030. (The engine casting is 328576, which on the net points to a 68+ 250 CID.)

For parts, etc., are we safe to conclude it is a 68 250, bored once?

(Oh yes...one more factoid...One piston appears to be original size, but cylinder it came out of is oversize.)

Thanks!

Mark

Shaky · 11-28-2010, 08:54 AM

When I'm trying to tell 250 from 292 the easy tell is the fuel pump location.

Fuel pump forward of engine mount = 250

Fuel pump aft of engine mount = 292

**LockDoc** · 11-28-2010, 08:56 AM

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The easy way to tell for me is by the side covers. On the 250 they are about 4" tall and on the 292 they are about 6" tall.

LockDoc

Shyguy · 11-28-2010, 09:59 AM

Here is a picture of a 250 L6

67Dad · 12-07-2010, 04:18 PM

Confirmed several ways that it is a 250. Found cracked cylinder when took apart "for fun".

Do any of you know if a 93 350 4 bolt will fit OK in the 67 c10 (it may be what we try to replace it with). Any issues?

Thanks for all the help!

Mark

**LockDoc** · 12-07-2010, 10:12 PM

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You will need to swap out the six cyl engine frame mounts for a pair of V-8 ones and probably change the radiator out for a three core one.

LockDoc

11-28-2010, 01:46 AM	#1
67Dad Registered User Join Date: Mar 2010 Location: houston texas Posts: 84	mystery engine 250, 292? Hi All: In our project, the SPID on the truck (1967) says it has a 292 inline 6. It DOES have an inline 6. After taking it apart, engine cylinders (measured with a regular dial caliper) measure 3.915 diameter. Stroke 3.5 +/- (sort of measured from cylinder wear marks,etc. not a great measurement yet, and crank is already off), which would go along with this being a later year 250 bored out .030. (The engine casting is 328576, which on the net points to a 68+ 250 CID.) For parts, etc., are we safe to conclude it is a 68 250, bored once? (Oh yes...one more factoid...One piston appears to be original size, but cylinder it came out of is oversize.) Thanks! Mark __________________ Mark 57 Austin Healey 3000 (sold many moons ago, unfortunately) 67 C10 (in progress, son's) w/ 1993 350 SBC, '96 Vortec heads (custom polished ports), EPS Performer intake, Holley carb, cam, MSD ignition 93 C4 Corvette (mostly done, son's)

11-28-2010, 08:54 AM	#2
Shaky Six in a row makes it go... Join Date: Mar 2009 Location: Vacationland: Maine Posts: 1,346	Re: mystery engine 250, 292? When I'm trying to tell 250 from 292 the easy tell is the fuel pump location. Fuel pump forward of engine mount = 250 Fuel pump aft of engine mount = 292 __________________ 67 C20 long step resto: http://67-72chevytrucks.com/vboard/s...d.php?t=342086 66 C10 long step build: http://67-72chevytrucks.com/vboard/s...=1#post3814790 CT to Alaska in a 67 C10: http://67-72chevytrucks.com/vboard/s...d.php?t=399224 “The height of sophistication is simplicity." - Clare Boothe Luce

11-28-2010, 08:56 AM	#3
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,658	Re: mystery engine 250, 292? - The easy way to tell for me is by the side covers. On the 250 they are about 4" tall and on the 292 they are about 6" tall. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

11-28-2010, 09:59 AM	#4
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: mystery engine 250, 292? Here is a picture of a 250 L6 Attached Images __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

12-07-2010, 04:18 PM	#5
67Dad Registered User Join Date: Mar 2010 Location: houston texas Posts: 84	Re: mystery engine 250, 292? Confirmed several ways that it is a 250. Found cracked cylinder when took apart "for fun". Do any of you know if a 93 350 4 bolt will fit OK in the 67 c10 (it may be what we try to replace it with). Any issues? Thanks for all the help! Mark __________________ Mark 57 Austin Healey 3000 (sold many moons ago, unfortunately) 67 C10 (in progress, son's) w/ 1993 350 SBC, '96 Vortec heads (custom polished ports), EPS Performer intake, Holley carb, cam, MSD ignition 93 C4 Corvette (mostly done, son's)

12-07-2010, 10:12 PM	#6
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,658	Re: mystery engine 250, 292? - You will need to swap out the six cyl engine frame mounts for a pair of V-8 ones and probably change the radiator out for a three core one. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -



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