292 to 350 engine swap...Do I need to replace crossmember - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Patsfan34 · 12-18-2009, 03:05 PM

I originally had this posted in the 4x4 section but only had 2 responses so I'm looking for a little more input.

I started breaking down my chassis, it's a 68 GMC 4x4 SWB that I'm turning into a 70 Chevy 4x4 SWB. The current engine is getting yanked out but while I was pulling drive shafts and shocks and other stuff, I noticed the motor mounts on the 292 have stands and all kinds of stuff. Once I yank this engine, I can just buy 350 motor mounts and be done right or no? Also, with the 292 to 350 swap will the placement of the tranny and t/case stay in the same place?

Further, if I do need to change crossmembers can I use the one that's on the 2wd SWB frame now and switch it to my 4x4 SWB chassis?

Happy Holidays,

Patsy!

**Classic Heartbeat** · 12-18-2009, 03:27 PM

2x4s and 4x4s are both different animals. You won't be able to use any of the 2x4 crossmember parts on the 4x4 chassis. The 292 uses a different frame mounts than the v-8 does. The short of it is if you are useing a 4x4 chassis, and v-8 engine then you need the v-8 engine crossmember for a 4x4 and not a 2x4. I believe that the rubber motor mounts are the same though. Hope this helps. WES

71 super · 12-18-2009, 03:38 PM

On a positive note, the 292 stuff seems to be desirable so you should be able to recoup money to buy the v8 stuff. I would check with billsbowties he parted a couple of blazers recently and may have the crossmember you need. Harold

Patsfan34 · 12-18-2009, 06:03 PM

Now I'm catching on! Looks like I better start shopping for a 4x4 SWB small block crossmember. Thanks everyone!

**Classic Heartbeat** · 12-18-2009, 06:07 PM

Any 4x4 V-8 engine crossmember will do from 67-72. They are all the same, 1/2 ton, 3/4 ton, Blazer, Jimmy, Suburban, Panel. long bed, or short bed. WES

Patsfan34 · 12-18-2009, 07:46 PM

Awesome thanks Wes!

12-18-2009, 03:05 PM	#1
Patsfan34 Registered User Join Date: Dec 2008 Location: New England Posts: 661	292 to 350 engine swap...Do I need to replace crossmember I originally had this posted in the 4x4 section but only had 2 responses so I'm looking for a little more input. I started breaking down my chassis, it's a 68 GMC 4x4 SWB that I'm turning into a 70 Chevy 4x4 SWB. The current engine is getting yanked out but while I was pulling drive shafts and shocks and other stuff, I noticed the motor mounts on the 292 have stands and all kinds of stuff. Once I yank this engine, I can just buy 350 motor mounts and be done right or no? Also, with the 292 to 350 swap will the placement of the tranny and t/case stay in the same place? Further, if I do need to change crossmembers can I use the one that's on the 2wd SWB frame now and switch it to my 4x4 SWB chassis? Happy Holidays, Patsy!

12-18-2009, 03:27 PM	#2
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,768	Re: 292 to 350 engine swap...Do I need to replace crossmember 2x4s and 4x4s are both different animals. You won't be able to use any of the 2x4 crossmember parts on the 4x4 chassis. The 292 uses a different frame mounts than the v-8 does. The short of it is if you are useing a 4x4 chassis, and v-8 engine then you need the v-8 engine crossmember for a 4x4 and not a 2x4. I believe that the rubber motor mounts are the same though. Hope this helps. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

12-18-2009, 03:38 PM	#3
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,081	Re: 292 to 350 engine swap...Do I need to replace crossmember On a positive note, the 292 stuff seems to be desirable so you should be able to recoup money to buy the v8 stuff. I would check with billsbowties he parted a couple of blazers recently and may have the crossmember you need. Harold __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle

12-18-2009, 06:03 PM	#4
Patsfan34 Registered User Join Date: Dec 2008 Location: New England Posts: 661	Re: 292 to 350 engine swap...Do I need to replace crossmember Now I'm catching on! Looks like I better start shopping for a 4x4 SWB small block crossmember. Thanks everyone!

12-18-2009, 06:07 PM	#5
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,768	Re: 292 to 350 engine swap...Do I need to replace crossmember Any 4x4 V-8 engine crossmember will do from 67-72. They are all the same, 1/2 ton, 3/4 ton, Blazer, Jimmy, Suburban, Panel. long bed, or short bed. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys Last edited by Classic Heartbeat; 12-18-2009 at 06:07 PM.

12-18-2009, 07:46 PM	#6
Patsfan34 Registered User Join Date: Dec 2008 Location: New England Posts: 661	Re: 292 to 350 engine swap...Do I need to replace crossmember Awesome thanks Wes!



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