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Unread 06-03-2012, 07:33 AM   #1
cj5ben
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305 in CJ5?

So along with my YJ build, which is a lot more complete, I am working on 70 CJ5. My friend offered me his running 305 for pretty much nothing. How hard would this swap be and would the 305 be worthwhile for me? I have a 7ish inch custom spring over lift, rear is dana 44 with detroit locker and 5.38 gearing. Planning on 35 inch tires, i think.

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Unread 06-03-2012, 07:54 AM   #2
turtlerace
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Swap isn't too bad but the 305 is a terrible engine.
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Unread 06-03-2012, 07:54 AM   #3
mopar408
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clarification:
305 Chevy or 304 AMC?
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Unread 06-03-2012, 07:54 AM   #4
cj5ben
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305 chevy
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Unread 06-03-2012, 07:55 AM   #5
cj5ben
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what are some downsides of the 305?
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Unread 06-03-2012, 08:02 AM   #6
turtlerace
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All of the small block Chevya from the 283 up to the 400 have redeeming qualities like ability to handle high revs or the make gobs of power in differing spots in the power band except the 305. It excels at nothing. Poor mileage, low power, and no one how how durable they are because they get sick of them and throw them out long before ever wearing one out!
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Unread 06-03-2012, 08:03 AM   #7
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Quote:
Originally Posted by mopar408 View Post
clarification:
305 Chevy or 304 AMC?
Pretty sure they are both the black sheep of their families.
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Unread 06-03-2012, 08:10 AM   #8
cj5ben
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so it sounds like trying to find a 350 is a better option
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Unread 06-03-2012, 08:19 AM   #9
turtlerace
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Much better engine with a much better return on your investment as far as power adders and resale.
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Unread 06-03-2012, 08:21 AM   #10
mopar408
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plus on 305 heads, if you ever let the engine get hot even once, heads are FUBAR.
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Unread 06-03-2012, 08:23 AM   #11
mopar346
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305s are good for striping to the bare block and using to mock up sb fitment, but other than that I cant think of a good use for them, they are too heavy to even make a good boat anchor.

EDIT: After reading 408's post I thought of another use, the heads WOULD make good boat anchors.

Long stroke, small bore just doesn't get it done. As mentioned useless engine, find a 350 pre or post TBI 350 if you must go sbc.

A few things to consider, isn't the 70 before they extended the front sheetmetal for the AMC engines? In a 5 you also need to be aware of the tranny lengths available.
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Unread 06-03-2012, 08:46 AM   #12
cj5ben
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yea i was thinking how to do the V8/trans swap as the frame is set up now for a 225 V6
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Unread 06-03-2012, 09:00 AM   #13
cj5ben
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what are some transmission&transfer case options for a 305/350? I only have a T14a right now and have a offset rear axle
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Unread 06-03-2012, 09:25 AM   #14
dg6772
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You may want to look at a Chevy 4.3 v-6. The vortec is 220 hp, roller cam & lifters, & can be carburated as well as fits in same space.
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Unread 06-03-2012, 11:01 AM   #15
mopar408
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and change to a T-15. 15 and 14 exchange 100% and 15 is bulletproof.
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