3.5 heads, or ?? - Defender Source
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  #1  
Old May 16th, 2014, 03:01 PM
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Skinny Pete
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3.5 heads, or ??

My '88 RRC with original 99k miles 3.5 is showing 30psi on cylinder #2. All other cylinders show proper compression of 165-170.

My guess is it needs a valve job. But, inside the valve covers is a right mess with carbon buildup everywhere. Guessing I will find similar situation under the valley pan, so, thinking will probably end up doing cam, lifters, timing set, and rebuild or replace the heads.

Would like to not have the vehicle down for too long, so, prefer to source good used or rebuilt heads. I don't think it much matters what they are from. What have you got?

Feel free to suggest other options.

Thanks, DB in DC
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  #2  
Old May 16th, 2014, 03:37 PM
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FWIW, I plan to get rid of my 3.5 and put a fuel injected 4.2 from a Range Rover in mine.
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  #3  
Old May 16th, 2014, 04:03 PM
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Quote:
Originally Posted by Paul K View Post
FWIW, I plan to get rid of my 3.5 and put a fuel injected 4.2 from a Range Rover in mine.
The RRC 3.5 is higher compression ratio than yours, electronic ignition, and of course fuel injected.
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  #4  
Old May 16th, 2014, 04:10 PM
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Quote:
Originally Posted by Uncle Douglas View Post
The RRC 3.5 is higher compression ratio than yours, electronic ignition, and of course fuel injected.

And therefore worth fixing & keeping!
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Old May 16th, 2014, 08:19 PM
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Dave -

One thing - 3.5 v8 motors came in a lot of flavors older than your RRC. Older spec heads will fit and work but they will have smaller valves and lower compression (like already mentioned).

If you stick to mostly any fuel injected motor then your heads should a good choice.

When I rebuilt my stage one 3.5 - I used heads from a 3.9 that Tillery sold to me. The valves were noticeably much bigger on the head from the fuel injected motor than my stock carb motor.

In the USA - you are probably more likely to only find newer big valve heads - but I thought I would mention it just to be safe.
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  #6  
Old May 18th, 2014, 08:21 AM
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I hear these 3.5's are fetching good coin in the UK now. Irony.

Clay
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Old May 18th, 2014, 10:44 AM
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I have some from a 3.9L. I don't know if they are the same.
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Old May 18th, 2014, 11:32 AM
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I hear these 3.5's are fetching good coin in the UK now. Irony.

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I sent the one from my 110 to the scrap metal yard.
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  #9  
Old May 18th, 2014, 11:54 AM
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I've got a friend coming over today with a borescope so we can take a peek inside the bad cylinder and see what's going on.
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