250 6cyl 4x4 crossmember questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**mikesjaarda** · 12-13-2017, 01:08 PM

Recently acquired a 68 4x4 frame set up for a 305 GMC. It has an offset engine crossmember. From what I am reading this engine crossmember will work for a 292 but perches are GMC only? I already have rebuilt my 250 and plan on using it. I'm wondering how rare these crossmembers are and if I've got a chance finding one for the 250?

1972RedNeck · 12-13-2017, 03:33 PM

I think a 250 uses the same one as a 327/350 - but don't quote me on that.

If you don't use the V6 member and perches, I would be interested in taking them off your hands...

CrewCab59 · 12-13-2017, 03:36 PM

Yes the 250 is the same as the V8 member , the V6 and 292 are the offset ones.

Thanks

**mikesjaarda** · 12-13-2017, 08:40 PM

If you can get me a symmetrical crossmember this one is yours

CrewCab59 · 12-13-2017, 08:54 PM

Here is the 292 4x4 top and V8 4x4 member bottom.

Thanks

**'68OrangeSunshine** · 12-13-2017, 11:19 PM

Some pix of the 292 X-member I'm saving for a K/5 ptoject:

**'68OrangeSunshine** · 12-13-2017, 07:26 PM

The 292 requires the diagonal X-member in a 4x4. This is because the RH motor mount is forward of the fuel pump. [Possibly to counteract torque-flex from a very tall block ? [idk].

On the 250 L6, the motor mounts are symmetrical, so I guess it shares a V8 SBC X-member in common. Not too expert on V8s or smaller L6s.
I know nothing about the big GMC V6s, so I won't venture a comment about them.

Yes. The 292 K-type crossmembers are rare. 292 RH perches are rare, too. If the GMC V6 uses the same X-member, then the V6 perches are even rarer.

**mikesjaarda** · 12-13-2017, 08:34 PM

Attached a photo of my crossmember. When assembled the mounts line up directly across from each other.

**'68OrangeSunshine** · 12-13-2017, 11:25 PM

OK. I see it. Wonder why the GMC V6 has asymmetrical mounts like the 292?

jd4320r · 09-05-2018, 10:52 PM

so how could some one find the 292 X member?

**'68OrangeSunshine** · 09-06-2018, 02:54 AM

Quote:

Originally Posted by jd4320r

so how could some one find the 292 X member?

Look in junkyards for old UPS trucks, schoolbusses, 1 tons. They ran a lot of the Heavy Duty Tall Deck L6s.
You may need to get creative and fab your own diagonal X-member by bending some 2 - 3'' tubing and a welder.
There's someone selling [ebay?] symmetrical 292 mount kits, but they require using an electric fuel pump because they bolt onto the 292's mechanical fuel pump mount. Not satisfactory for me.
Find someone dumb enough to be ditching a 292 for the heavier, shorter-lasting SBC, and get his stuff off him.
You could also check the ''Swap Meet'' bulletin board at www.inliners.org

jd4320r · 09-06-2018, 11:19 PM

Thanks for the help..

12-13-2017, 01:08 PM	#1
mikesjaarda Junior Member Join Date: Aug 2016 Location: grandville, michigan Posts: 26	250 6cyl 4x4 crossmember questions Recently acquired a 68 4x4 frame set up for a 305 GMC. It has an offset engine crossmember. From what I am reading this engine crossmember will work for a 292 but perches are GMC only? I already have rebuilt my 250 and plan on using it. I'm wondering how rare these crossmembers are and if I've got a chance finding one for the 250?

12-13-2017, 03:36 PM	#3
CrewCab59 Registered User Join Date: Jul 2010 Location: Knoxville,TN Posts: 1,185	Re: 250 6cyl 4x4 crossmember questions Yes the 250 is the same as the V8 member , the V6 and 292 are the offset ones. Thanks __________________ 1972 Custom Deluxe 20 4x4 burb 1971 GMC SWB CST 4x4 1972 GMC k20 4x4 (X- brush truck ) 1971 Chevy CST Blazer 4x4 1971 Chevy C/10 1970 Cab Chassis C30 157" 1971 Cab Chassis Custom 30 Deluxe 157" 292/4spd ( Napco Replica ) 1988 Chevy V30 4x4 wrecker challenger 4812

12-13-2017, 08:40 PM	#4
mikesjaarda Junior Member Join Date: Aug 2016 Location: grandville, michigan Posts: 26	Re: 250 6cyl 4x4 crossmember questions If you can get me a symmetrical crossmember this one is yours

12-13-2017, 08:54 PM	#5
CrewCab59 Registered User Join Date: Jul 2010 Location: Knoxville,TN Posts: 1,185	Re: 250 6cyl 4x4 crossmember questions Here is the 292 4x4 top and V8 4x4 member bottom. Thanks Attached Images __________________ 1972 Custom Deluxe 20 4x4 burb 1971 GMC SWB CST 4x4 1972 GMC k20 4x4 (X- brush truck ) 1971 Chevy CST Blazer 4x4 1971 Chevy C/10 1970 Cab Chassis C30 157" 1971 Cab Chassis Custom 30 Deluxe 157" 292/4spd ( Napco Replica ) 1988 Chevy V30 4x4 wrecker challenger 4812

12-13-2017, 11:19 PM	#6
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Re: 250 6cyl 4x4 crossmember questions Some pix of the 292 X-member I'm saving for a K/5 ptoject: Attached Images __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

12-13-2017, 07:26 PM	#7
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Re: 250 6cyl 4x4 crossmember questions The 292 requires the diagonal X-member in a 4x4. This is because the RH motor mount is forward of the fuel pump. [Possibly to counteract torque-flex from a very tall block ? [idk]. On the 250 L6, the motor mounts are symmetrical, so I guess it shares a V8 SBC X-member in common. Not too expert on V8s or smaller L6s. I know nothing about the big GMC V6s, so I won't venture a comment about them. Yes. The 292 K-type crossmembers are rare. 292 RH perches are rare, too. If the GMC V6 uses the same X-member, then the V6 perches are even rarer. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 12-13-2017 at 11:26 PM.

12-13-2017, 08:34 PM	#8
mikesjaarda Junior Member Join Date: Aug 2016 Location: grandville, michigan Posts: 26	Re: 250 6cyl 4x4 crossmember questions Attached a photo of my crossmember. When assembled the mounts line up directly across from each other. Attached Images

12-13-2017, 11:25 PM	#9
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Re: 250 6cyl 4x4 crossmember questions OK. I see it. Wonder why the GMC V6 has asymmetrical mounts like the 292? __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

09-05-2018, 10:52 PM	#10
jd4320r Registered User Join Date: Sep 2015 Location: Denton NE Posts: 4	Re: 250 6cyl 4x4 crossmember questions so how could some one find the 292 X member?

09-06-2018, 11:19 PM	#12
jd4320r Registered User Join Date: Sep 2015 Location: Denton NE Posts: 4	Re: 250 6cyl 4x4 crossmember questions Thanks for the help..

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