What kind of engine is this?

[jburr09]

Sorry, I'm new here and green to this type of thing, but I just picked up this rig and am trying to identify the power plant... Any ideas? i was told it was a 283, and another person said it was a 327...

 

[harleydragon]

no visible way except the block casting number ...

Here are some casting numbers:

283s
3731548 1957
3556519 1958 - 61
3737739 1958 - 61
3849852 1958 - 67
3789935 1962 - 67
3864812 1962 - 64
3896944 1965 - 67
393288 1965 - 67

327s
3782870 1962 - 67
3789817 1962 - 67
3852174 1962 - 67
3892657 1965 - 67
3914660 1968 - 69 Hi-po (Corvette, Camaro)
3914678 1968 - 69 Hi-po (Corvette, Camaro)
3932386 1968 - 69 Hi-po (Corvette, Camaro)
3955618 1968 - 69 Hi-po (Corvette, Camaro)

350s
3855961 1968 on
3932388 1968 on
3958618 1968 on
6259425 1968 on
3956618 1968 on
3970010 1968 on Very common four-inch block
3932386 1968 on

 

[Old Dog]

Both engine look the same, only way to tell for sure is to run the block casting #'s. here's where to look for them Chevy V-8 Engine Block and Head Casting Number Locations

 

[jburr09]

thanks guys... while i have yall, can yall help id my front and rear differentials and Transfer Case .. attached is the front diff

 

[jburr09]

Here is the rear diff and Transfer Case ....

 

[Bog Dog]

The rear is an AMC20 , and the front appears to be a Dana 30 . Not 100% on the t case but looks like a Dana 20 . More savvy jeepers feel free to correct me.

 

[cj7inthetwigs]

Hopefully its a 327...with a 283 crank...ohh yeah...both are quick revving bad *** motors IMO..let us know what you find out

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[harleydragon]

Hopefully its a 327...with a 283 crank...ohh yeah...both are quick revving bad behind motors IMO..let us know what you find out

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that would make it a 302..chevy used this combination available in the 67-69 z28's only..I had one built to the hilt in a vega bodied drag car years back..as quoted above this is a very fast reving engine capable of high rpm's.mine shifted at 9000 rpm's but I have heard of them turning 10,000..I would guess that odd's are this is not one of those but who knows..

 

[cj7inthetwigs]

Doubtful yes,maybe a small journal block though. I figured you would catch that! I had a punched out 283 in a 63 chevy 2 ..yep,muncie m21 and it was fast...anywho,I would pull the bowtie and get yourself a AMC 258 i6 / 4.2l ! Don't worry, I can pay for shipment of said bowtie so it doesn't get in your way:sly:

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[Petescj]

Doubtful yes,maybe a small journal block though. I figured you would catch that! I had a punched out 283 in a 63 chevy 2 ..yep,muncie m21 and it was fast...anywho,I would pull the bowtie and get yourself a AMC 258 i6 / 4.2l ! Don't worry, I can pay for shipment of said bowtie so it doesn't get in your way:sly:

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I dont see a 900 rpm small block being very useful in a Cj. What kind of low end torque do they have?

 

[harleydragon]

Doubtful yes,maybe a small journal block though. I figured you would catch that! I had a punched out 283 in a 63 chevy 2 ..yep,muncie m21 and it was fast...anywho,I would pull the bowtie and get yourself a AMC 258 i6 / 4.2l ! Don't worry, I can pay for shipment of said bowtie so it doesn't get in your way:sly:

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yeah,67 302 and other small blocks had the small journals..68 they went to the larger journals..mine was a large journal with a steel crank,pink rods,12 1/2 pistons,early model fuel injection type heads with 2.02's.It had the Duntoff 30-30 cam which is what chevy used when they set it's horse power ratings..mine was a hoss.back then pump gas was 103 octane but it ran it's best when I mixed it with av gas

 

[harleydragon]

I dont see a 900 rpm small block being very useful in a Cj. What kind of low end torque do they have?

agreed,unless you were strictly competition mud bogging..they made their power way up on the rpm scale

 

[cj7inthetwigs]

Last I mention this continuation, feel like I have hijacked the thread. I havent heard duntoff in forever 30 30 offroad cam and double hump heads..when Holley didn't even make a good anchor for catfishing

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[harleydragon]

Last I mention this continuation, feel like I have hijacked the thread. I havent heard duntoff in forever 30 30 offroad cam and double hump heads..when Holley didn't even make a good anchor for catfishing

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Yeah,I apologize if we hijacked it..But hey,if the guy is gonna run an old small block,he might as well get educated

 

[harleydragon]

The rear is an AMC20 , and the front appears to be a Dana 30 . Not 100% on the t case but looks like a Dana 20 ..

back on subject...I agree..all this was stock in a 79

 

[Peanut Butter]

My bet is that it is a plain old 350. Given the condition of the drivetrain, I seriously doubt anybody would put that kinda money in an engine and not take care of it and everything else. How about some pictures of the rest of the story (Paul Harvey) or should I say Jeep for you younger guys. Rod

 

[harleydragon]

My bet is that it is a plain old 350. Given the condition of the drivetrain, I seriously doubt anybody would put that kinda money in an engine and not take care of it and everything else. How about some pictures of the rest of the story (Paul Harvey) or should I say Jeep for you younger guys. Rod

that might be a good bet..most of the 283's and 327's had the oil filler tube in the intake..and most had a single curved arm to adjust the alternator

 

[jburr09]

I appreciate the input. I'm going out to it tomorrow and I'll get some pics of the input and alternator.Thanks Again:rock: