350 to 292 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1972RedNeck · 07-12-2013, 06:43 PM

I would like to stick a 292 in my '72 K20. One of the motor mounts is in the correct location, right? The other has to be moved? Are 350 and 292 frame brackets the same? The cross member is different.

sanford&daughter · 07-12-2013, 06:54 PM

Frame brackets are different and the 6 uses the rear holes in the frame I believe

**'68OrangeSunshine** · 07-12-2013, 07:35 PM

I know the K/10s required a diagonal-running x-mbr under the 292 L6 [only]. Not sure about the K/20s and 30s.
I have one I'm saving for a 292 K/5 project, but I'll shoot you a pic if needed.
I think the L6 towers are different. The 292 uses a different passenger side tower than the 250. The drivers side tower is the same I'm told. [Never ran a 250 L6.]

1972RedNeck · 07-12-2013, 11:13 PM

So the frame towers are different, huh? Anybody have a cross member and towers they want to trade for my SBC ones?

pritch · 07-12-2013, 11:14 PM

Quote:

Originally Posted by '68OrangeSunshine

I know the K/10s required a diagonal-running x-mbr under the 292 L6 [only]. Not sure about the K/20s and 30s.
I have one I'm saving for a 292 K/5 project, but I'll shoot you a pic if needed.
I think the L6 towers are different. The 292 uses a different passenger side tower than the 250. The drivers side tower is the same I'm told. [Never ran a 250 L6.]

X2. I'm pretty sure they all (K10, K20 & on up) had that funky cross member. I believe it's one of the most specific parts on these trucks. If you want a 292 in a 4X4, your gonna need one. And I further believe that the motor mount towers are different between the 4WD and 2WD, and the mounts themselves are more like the clam shell style.

franken · 07-13-2013, 12:42 AM

Hold up...
350 to 292?
Probably not a great idea.

The GM 350 is probably the most common engine in the world. Being common, means parts are cheap.

Nothing wrong with the 292, but why swim upstream?

1972RedNeck · 07-13-2013, 08:32 AM

Quote:

Originally Posted by franken

The GM 350 is probably the most common engine in the world. Being common, means parts are cheap.

Nothing wrong with the 292, but why swim upstream?

4.125" stroke, 7 main bearings, roomier engine compartment, less common, harder to build and everyone knows that 6 is greater than 8.

It's always easier to shoot things floating downstream than swimming upstream.

**'68OrangeSunshine** · 07-13-2013, 07:31 PM

If a 292 costs twice as much to build as a 350, you're still ahead since it will last three times as long. I've been running 292s in my C/10 for only 40 years now, so I'm talking from experience not theory. I can't say how many V8s I've lunched.
The 292 is about 120 Lbs lighter than the SBC.
The 292 has deep growling torque -- perfect for a 4x4.
The 292 tolerates desert heat much better than a V8.
The only reason GM dealers didn't like to option the 292, was the crossmember issue, I figure.
Dealers had a hard sell approach pushing the 350 and the automatic tranny, back in the day.
I may have a pic of the X-mbr in my files. But I'll have to search and post later.

**'68OrangeSunshine** · 07-13-2013, 07:53 PM

Here you go. Some pix of the 292-Only K/ Series crossmember. The towers are the same for the C/ and K/ Series, I think. I will have to dig that part out of the back of the Suburban [parts locker] and match it to the one on the C/10 Stepside.

1972RedNeck · 07-13-2013, 07:56 PM

Where could I find one? I've called around to all the yards and no one has any.

pritch · 07-13-2013, 08:53 PM

Quote:

Originally Posted by 1972RedNeck

Where could I find one? I've called around to all the yards and no one has any.

Your looking for 20 pounds of pure Unobtainium. You need to find a K series that still has the 292 in it. A tall order, since anyone with any sense at all hacked that sucker outta there 30 years ago so they install the "normal" cross brace so they could drop in a 350 and be, you know, common.

pritch · 07-13-2013, 09:00 PM

Quote:

Originally Posted by '68OrangeSunshine

Here you go. Some pix of the 292-Only K/ Series crossmember. The towers are the same for the C/ and K/ Series, I think. I will have to dig that part out of the back of the Suburban [parts locker] and match it to the one on the C/10 Stepside.

Naw, the towers are different, too, between the C & K. See, I found a 69 K with a 292 in a yard a few years ago and I took the motor and the towers. I found out that those towers are completely different. After some research, I discovered how rare that X member is, I went back and got it so I can build a 292 4X4, too.

71sixgun · 07-13-2013, 09:05 PM

Quote:

Originally Posted by 1972RedNeck

4.125" stroke, 7 main bearings, roomier engine compartment, less common, harder to build and everyone knows that 6 is greater than 8.

It's always easier to shoot things floating downstream than swimming upstream.

I like it!

1972RedNeck · 07-13-2013, 09:44 PM

Does the 292 use the same insulators as a 350?

**'68OrangeSunshine** · 07-15-2013, 10:27 PM

Quote:

Originally Posted by 1972RedNeck

Does the 292 use the same insulators as a 350?

Yes.

07-12-2013, 06:54 PM	#2
sanford&daughter Registered User Join Date: Dec 2012 Location: Upstate , New York Posts: 647	Re: 350 to 292 Frame brackets are different and the 6 uses the rear holes in the frame I believe

07-12-2013, 07:35 PM	#3
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,510	Re: 350 to 292 I know the K/10s required a diagonal-running x-mbr under the 292 L6 [only]. Not sure about the K/20s and 30s. I have one I'm saving for a 292 K/5 project, but I'll shoot you a pic if needed. I think the L6 towers are different. The 292 uses a different passenger side tower than the 250. The drivers side tower is the same I'm told. [Never ran a 250 L6.] __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

07-13-2013, 12:42 AM	#6
franken Registered User Join Date: Jun 2013 Location: Somewhere Posts: 3,127	Re: 350 to 292 Hold up... 350 to 292? Probably not a great idea. The GM 350 is probably the most common engine in the world. Being common, means parts are cheap. Nothing wrong with the 292, but why swim upstream?

07-13-2013, 07:31 PM	#8
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,510	Re: 350 to 292 If a 292 costs twice as much to build as a 350, you're still ahead since it will last three times as long. I've been running 292s in my C/10 for only 40 years now, so I'm talking from experience not theory. I can't say how many V8s I've lunched. The 292 is about 120 Lbs lighter than the SBC. The 292 has deep growling torque -- perfect for a 4x4. The 292 tolerates desert heat much better than a V8. The only reason GM dealers didn't like to option the 292, was the crossmember issue, I figure. Dealers had a hard sell approach pushing the 350 and the automatic tranny, back in the day. I may have a pic of the X-mbr in my files. But I'll have to search and post later. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

07-13-2013, 07:53 PM	#9
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,510	Re: 350 to 292 Here you go. Some pix of the 292-Only K/ Series crossmember. The towers are the same for the C/ and K/ Series, I think. I will have to dig that part out of the back of the Suburban [parts locker] and match it to the one on the C/10 Stepside. Attached Images __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.



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