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Does anyone know what 4 cyl GM this i...

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Daniel Wallace
New member
Username: mr850i

Post Number: 1
Registered: 12-2011
Posted on Thursday, December 08, 2011 - 03:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I purchased 19' Crestliner DC, It's a late 60's or early 70's boat, don't really know because the tag is missing. The hull ID wont give me the engine info. I think it's a 153ci / 120hp but the dual carter's are throwing me a curve. Does anyone have any ideas??
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Roger DiRuscio
Senior Member
Username: solarrog

Post Number: 501
Registered: 03-2002


Posted on Thursday, December 08, 2011 - 03:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I believe this is the Chevy Iron Duke, I used to have one with 2 Rochester Carburetors. What is your concern?
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Daniel Wallace
New member
Username: mr850i

Post Number: 2
Registered: 12-2011
Posted on Thursday, December 08, 2011 - 03:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Just trying to figure out the HP (100, 120 or 150) and trying to figure out pricing on rebuild kits. Not sure if it's 153ci or 181ci. Just doing my research before I tear it down.
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Roger DiRuscio
Senior Member
Username: solarrog

Post Number: 502
Registered: 03-2002


Posted on Thursday, December 08, 2011 - 03:49 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have owned a few, if memory serves me the single carb version was 120HP the twin carb version was 140 HP. Im certain there are other factors
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Gonzo Couto-Lain
Member
Username: gonzo

Post Number: 22
Registered: 06-2011
Posted on Friday, December 09, 2011 - 12:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The 120Hp is a 2.5lt and the 140Hp is a 3.0lt. The first has the same pistons as the 305 and the second as the 350.
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Eddie Ross
Senior Member
Username: eddie

Post Number: 278
Registered: 04-2003
Posted on Sunday, December 11, 2011 - 10:11 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Isn't that basically the same engine that is in the Chevy S-10 pickup truck ? You can also see a lineage with GM's 250 inline 6 cylinder. The block looks like a 250 with 2 cylinders lopped off.
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Ernie
Senior Member
Username: ernie

Post Number: 1455
Registered: 01-2002


Posted on Sunday, December 11, 2011 - 01:18 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The engine actualy showed up in the 1962 Chevy II as a 153 I think. Digging in the cobwebs at teh back of my head there was a 153 4 cylinder a 194 6 cylinder a 230 6 cylinder (the 250 didn't show up till about 1965) and even the 283 V8. The 283 might not have been available till 63.

Wikipedia Chevy II history here
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Roger DiRuscio
Senior Member
Username: solarrog

Post Number: 503
Registered: 03-2002


Posted on Sunday, December 11, 2011 - 01:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have some parts to one of the chevy/mercury 4 cylinder engines if any one has a need. I had one with a cracked block, I kept the crankshaft, cam, carburetor. The exhaust manifold was also cracked. I think I also have the belhousing and flywheel, & a box of other stuff.
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Eddie Ross
Senior Member
Username: eddie

Post Number: 279
Registered: 04-2003
Posted on Sunday, December 11, 2011 - 02:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The 250 6 cylinder is basically the same as the one introduced in the 1962 Chevy II. It survived into the mid 1980s in Chevy and GMC trucks and vans. The is also a 292 version used in trucks that is the same block.
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Ernie
Senior Member
Username: ernie

Post Number: 1456
Registered: 01-2002


Posted on Sunday, December 11, 2011 - 06:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The 292 and the 250 don't share the same block. The 292 is a lot taller to allow it to have a much longer stroke and a lot more torque. They do share the same bore spacing so the head and manifolds interchange on most of them with external manifolds
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J.B. Castagnos
Senior Member
Username: jb_castagnos

Post Number: 633
Registered: 07-2002


Posted on Sunday, December 11, 2011 - 08:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The Iron Duke was first introduced by Pontiac, had a cross flow head with the intake on one side and the exahaust on the other, similar to a V-8 head.
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Eddie Ross
Senior Member
Username: eddie

Post Number: 280
Registered: 04-2003
Posted on Sunday, December 11, 2011 - 08:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Ernie, thanks for the correction. I owned two vehicles with 250 6 cylinders. I was aware that there was a 292 truck engine and was once told that it was actually the same block but a larger bore. I did not verify that.
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Ernie
Senior Member
Username: ernie

Post Number: 1457
Registered: 01-2002


Posted on Sunday, December 11, 2011 - 10:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Not sure on the bore but the stroke was real long and they really did have a ton of torque. You could tell be looking at the side covers they almost looked square instead of rectangular.
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Lawrence Wolfe
Member
Username: larry_from_md

Post Number: 30
Registered: 06-2010
Posted on Monday, December 12, 2011 - 07:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The 292 truck engine has a slighly taller head too. You can exchange the heads between the 2 engines if you have all the parts.The push rods are allso a little longer along with a taller valve cover.
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Ricky Rice
Visitor
Posted on Thursday, May 17, 2012 - 11:29 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I have the same engine and I'v been trying to find out what it is so I can get the specs on how to torque the head bolts and in what order
if anyone knows a web site to help me e-mail me at iam187ricky@aol.com
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Ernie
Senior Member
Username: ernie

Post Number: 1491
Registered: 01-2002


Posted on Thursday, May 17, 2012 - 02:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

search on the net for Chevy 6 cylinder id and you should find what you need
Hope this helps
Ernie
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Lawrence Wolfe
Advanced Member
Username: larry_from_md

Post Number: 36
Registered: 06-2010
Posted on Thursday, May 17, 2012 - 06:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Head bolts are 90 to 95 ft.lbs for all the engines in this series,4-153,6-230,6-250,6-292.
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Dave Wyoming
Visitor
Posted on Friday, July 31, 2015 - 05:41 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

That looks exactly like the the GMC 4-cyl 120 engine in my 1972 boat by Cruisers, Inc. in Oconto, Wisconsin.(Now defunct.) The boat was outfitted by OMC. It's a stern drive with a cuddy cabin. Engine runs great. My neighbor looked at it and called in an "Iron Mule", and my boat mechanic called it an "Iron Duke", although I think the Iron Duke wasn't built till '77. This engine says '69.

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