New Question! What 6cyl do I have - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1971Stepside** · 09-18-2003, 02:26 PM

OK, sorry guys but the 68 needs new plugs/wires etc. Problem is I don't know what size 6 cylinder it is. Anyone know. I was able to get these numbers off the block 392-1968. I couldn't read the he ones by the carb, but they started out with 392 as well. I hope that is enough to go on for someone.

zyggy72 · 09-18-2003, 02:29 PM

To me, it looks like a 292 but don't take my word for it.

**CPNE** · 09-18-2003, 02:34 PM

292 will have taller pushrod covers than a 250. It will also have the fuel pump located differently (either behind or in front of motor mount, can't remember). This is of little help but if you measure covers and descibe location of pump, maybe someone can fill in details.

**CPNE** · 09-18-2003, 02:35 PM

Also, if 292, it should be listed on your glovebox option sheet.

**1971Stepside** · 09-18-2003, 02:39 PM

There is nothing listed on the glove box sheet other than moulding, powerglide, and about four other things. Nothing about the motor. So, does that mean it is a 250? I'm pretty sure the pump is in front of the motor mount.

**CPNE** · 09-18-2003, 02:40 PM

250. Trust me...

**1971Stepside** · 09-18-2003, 02:46 PM

OK, CPNE thanks. They said the plugs for the 292 had extended tips and I wasn't sure which ones to get.

Any idea on the gap for the plug?

Thanks again.

**CPNE** · 09-18-2003, 02:54 PM

.035 with points, .045 with HEI

dubie · 09-18-2003, 02:57 PM

easiest way to tell is look at the motor mounts. The 292 is mounted on offset mounts while the 250 is mounted on parallels.

JJR · 09-18-2003, 03:24 PM

Just curious, Is that an air pump on the upper drivers side? It doesn't look like a PS pump.

Hooter · 09-18-2003, 03:32 PM

the defineitly is an air pump on that beast, how is it for torque?

stelth2002 · 09-18-2003, 04:45 PM

I agree it looks like a 250 to me too.

**1971Stepside** · 09-18-2003, 04:50 PM

Motor mounts are not offset. The motor has a smog pump on it. Alt is mounted under it (where PS normally is).

Thanks guys. I'll put the new plugs/wires in tonight. The wife wants to take her out cruisin tomorrow night!

72shorty · 09-18-2003, 05:00 PM

Opened my hood, yep, looks the same. I've got a 250.

**'68OrangeSunshine** · 09-19-2003, 06:30 AM

If you look at the numbers & letters stamped on the machined pad just behind the distributor, you will see 2 or 3 letters. These letters can be run against a list in the LMC catalog index. It goes by year and displacement. '68 250s run like:TA, PF, TE, TT, PV, PW, TF, TC, TD, PX, PC. That listing is by no means written in stone. It does not correctly list my '68 292, "XAE" I have to dig deeper for that. Original owner's warranty -exchanged motor? XA and XE were used in '69 for 350s. This ain't no SBC.

HTH

**1971Stepside** · 09-19-2003, 09:32 AM

Thanks all. I changed the plugs and wires last night with no problems.

09-18-2003, 02:26 PM	#1
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	New Question! What 6cyl do I have OK, sorry guys but the 68 needs new plugs/wires etc. Problem is I don't know what size 6 cylinder it is. Anyone know. I was able to get these numbers off the block 392-1968. I couldn't read the he ones by the carb, but they started out with 392 as well. I hope that is enough to go on for someone. Attached Images __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

09-18-2003, 02:34 PM	#3
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	292 will have taller pushrod covers than a 250. It will also have the fuel pump located differently (either behind or in front of motor mount, can't remember). This is of little help but if you measure covers and descibe location of pump, maybe someone can fill in details. __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

09-18-2003, 02:35 PM	#4
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	Also, if 292, it should be listed on your glovebox option sheet. __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

09-18-2003, 02:39 PM	#5
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	There is nothing listed on the glove box sheet other than moulding, powerglide, and about four other things. Nothing about the motor. So, does that mean it is a 250? I'm pretty sure the pump is in front of the motor mount. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

09-18-2003, 02:40 PM	#6
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	250. Trust me... __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

09-18-2003, 02:29 PM	#2
zyggy72 Can't kick the addiction! Join Date: Jan 2002 Location: Riverton, CT 06065 Posts: 402	To me, it looks like a 292 but don't take my word for it.

09-18-2003, 02:46 PM	#7
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	OK, CPNE thanks. They said the plugs for the 292 had extended tips and I wasn't sure which ones to get. Any idea on the gap for the plug? Thanks again. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

09-18-2003, 02:54 PM	#8
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	.035 with points, .045 with HEI __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

09-18-2003, 02:57 PM	#9
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,853	easiest way to tell is look at the motor mounts. The 292 is mounted on offset mounts while the 250 is mounted on parallels. __________________ My name's Tim and I'm a truckaholic My 56 Chevy shop truck build http://67-72chevytrucks.com/vboard/s...d.php?t=562795

09-18-2003, 03:24 PM	#10
JJR Registered User Join Date: Apr 2000 Location: Leesburg, GA Posts: 746	Just curious, Is that an air pump on the upper drivers side? It doesn't look like a PS pump. __________________ FOUNDING MEMBER OF THE DRUM BRAKE CLUB Second Owner 70 C-10 Second Owner 93 GMC C1500 Third Owner 99 C2500 Crew Cab Short Bed

09-18-2003, 03:32 PM	#11
Hooter My other Love Join Date: Aug 2001 Location: Castlegar B.C. Canada Posts: 4,085	the defineitly is an air pump on that beast, how is it for torque? __________________ Castlegar B.C.The great white North (Canada Eh!) Hooter_5@hotmail.com First generation Monte Carlo club pictures of my life

09-18-2003, 04:45 PM	#12
stelth2002 Young Gun wth Fast Inline Join Date: Jan 2002 Location: Idaho Posts: 1,475	I agree it looks like a 250 to me too. __________________ 1967 Chevrolet LWB with built 292! 415 ft. lbs of torque, 4 speed :O with 27% overdrive too, 3.73 Posi. Frame and body done... getting painted!!!

09-18-2003, 04:50 PM	#13
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	Motor mounts are not offset. The motor has a smog pump on it. Alt is mounted under it (where PS normally is). Thanks guys. I'll put the new plugs/wires in tonight. The wife wants to take her out cruisin tomorrow night! __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

09-18-2003, 05:00 PM	#14
72shorty Registered User Join Date: Aug 2003 Location: Independence, MO Posts: 216	Opened my hood, yep, looks the same. I've got a 250. __________________ Douglas King Independence, MO

09-19-2003, 06:30 AM	#15
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	If you look at the numbers & letters stamped on the machined pad just behind the distributor, you will see 2 or 3 letters. These letters can be run against a list in the LMC catalog index. It goes by year and displacement. '68 250s run like:TA, PF, TE, TT, PV, PW, TF, TC, TD, PX, PC. That listing is by no means written in stone. It does not correctly list my '68 292, "XAE" I have to dig deeper for that. Original owner's warranty -exchanged motor? XA and XE were used in '69 for 350s. This ain't no SBC. HTH __________________ Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 09-19-2003 at 06:42 AM.



Register or Log In To remove these advertisements.

09-19-2003, 09:32 AM	#16
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	Thanks all. I changed the plugs and wires last night with no problems. __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Register or Log In To remove these advertisements.