straight six interchangeabilty - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**crossy** · 08-29-2003, 09:49 AM

straight sixes. right now I have an 84 with 250 CID integeral head.
I need an engine and because i am going to sell the truck i am trying to make it easy on myself (for once!). I'm not too worried about the exhaust side but what engines are a direct bolt in for the 250 . brackets/ pulleys, etc. . I hear a lot about 292s but they have been around so long are they the same physically as the 250 or the old 235 series engines. ?

I was pretty sure the 194/230 series was the same but not sure on the 292's. thanx . DAVE

dubie · 08-29-2003, 10:09 AM

The 292 motor mounts are offset unlike the 250 that are straight across from each other. The 235 should be an easy replacement. I believe the only real difference in actual appearance is the 235 has a longer block.

**truckster** · 08-29-2003, 11:04 AM

I replaced the broken 292 that was in my truck when I bought it with a 250, thinking it would be an easy swap. I should have gone straight to the V8 for all the work it took.

**crossy** · 08-29-2003, 11:33 AM

ok so now I know it's a 250 only. Now my problem is finding a good 20 year old engine cheap, and I'm the type the has to hear it run! thanx, DAVE

Fred T · 08-29-2003, 12:03 PM

The 194, 230 and 250 are the same blocks and mounts. The 250 is the best choice. The 292 has a different mount on the right side, and is taller.

The older 235/261/216 are not interchangeable with the newer block. They are wider blocks.

For more info, Leo Santucci has a book on the newer sixes, with a lot of good info. Chevrolet Inline Six-Cylinder Power Manual. It's $14 at amazon.

**'68OrangeSunshine** · 08-29-2003, 03:46 PM

You can rebuild your '80s lower block (rotating assembly) and bolt on a non-integral head from an earlier year (pre-'75).
That will give you the ability of using aftermarket high performance equipment like headers, 4Bbl carb, Clifford or Offy intake. Heads from '67 to '74 250s should be your search target. Newer valves/hardened valve seats should be installed to update for unleaded gas.

**old Rusty C10** · 08-29-2003, 05:12 PM

if ya catch me right ill sell ya mine for $200 you bruing your cherry picker and help pull it out of the truck in my yard you can hear it all ya want its a good one but its not an integral head one
hell ill trade for a running eight thatis in same shape

*gmtrucksaddict* · 08-31-2003, 01:40 PM

54 and older are old style bellhousing design and wont bolt to any trannies 55-up

Longhorn Man · 08-31-2003, 01:42 PM

The 250 was still in use through the 80's in work vans. I see plenty of them in junk yards all the time.
I am asuming they are 250 ci though.

08-29-2003, 09:49 AM	#1
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	straight six interchangeabilty straight sixes. right now I have an 84 with 250 CID integeral head. I need an engine and because i am going to sell the truck i am trying to make it easy on myself (for once!). I'm not too worried about the exhaust side but what engines are a direct bolt in for the 250 . brackets/ pulleys, etc. . I hear a lot about 292s but they have been around so long are they the same physically as the 250 or the old 235 series engines. ? I was pretty sure the 194/230 series was the same but not sure on the 292's. thanx . DAVE __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

08-29-2003, 10:09 AM	#2
dubie Registered User Join Date: May 2000 Location: Flin Flon, Manitoba, Canada Posts: 8,855	The 292 motor mounts are offset unlike the 250 that are straight across from each other. The 235 should be an easy replacement. I believe the only real difference in actual appearance is the 235 has a longer block. __________________ 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

08-29-2003, 11:04 AM	#3
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,954	I replaced the broken 292 that was in my truck when I bought it with a 250, thinking it would be an easy swap. I should have gone straight to the V8 for all the work it took. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

08-29-2003, 11:33 AM	#4
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	ok so now I know it's a 250 only. Now my problem is finding a good 20 year old engine cheap, and I'm the type the has to hear it run! thanx, DAVE __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

08-29-2003, 12:03 PM	#5
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	The 194, 230 and 250 are the same blocks and mounts. The 250 is the best choice. The 292 has a different mount on the right side, and is taller. The older 235/261/216 are not interchangeable with the newer block. They are wider blocks. For more info, Leo Santucci has a book on the newer sixes, with a lot of good info. Chevrolet Inline Six-Cylinder Power Manual. It's $14 at amazon. __________________ Fred There is no such thing as too much cam...just not enough engine.

08-29-2003, 03:46 PM	#6
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,440	You can rebuild your '80s lower block (rotating assembly) and bolt on a non-integral head from an earlier year (pre-'75). That will give you the ability of using aftermarket high performance equipment like headers, 4Bbl carb, Clifford or Offy intake. Heads from '67 to '74 250s should be your search target. Newer valves/hardened valve seats should be installed to update for unleaded gas. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

08-29-2003, 05:12 PM	#7
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,303	if ya catch me right ill sell ya mine for $200 you bruing your cherry picker and help pull it out of the truck in my yard you can hear it all ya want its a good one but its not an integral head one hell ill trade for a running eight thatis in same shape __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

08-31-2003, 01:40 PM	#8
gmtrucksaddict Account Suspended Join Date: Aug 2003 Location: IL Posts: 60	54 and older are old style bellhousing design and wont bolt to any trannies 55-up

08-31-2003, 01:42 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	The 250 was still in use through the 80's in work vans. I see plenty of them in junk yards all the time. I am asuming they are 250 ci though.



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