Four barrel intake on 77 cj5 4.2l -
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Unread 02-17-2008, 06:58 AM   #1
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2003 TJ Wrangler 
Join Date: Jul 2003
Location: Williamsport, MD
Posts: 11
Four barrel intake on 77 cj5 4.2l

Asking a question for a friend here. He has a 77 CJ5 with a 4.2. He was wondering if there are problems putting a aftermarket four barrel intake on. He thinks it might interfear with the master cylinder.

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Unread 02-17-2008, 08:29 AM   #2
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1970 CJ5 
Join Date: Nov 2006
Location: Oklahoma City, OK
Posts: 2,369
I've seen pics of guys that have had problems with air cleaner interference. "Where there's a will, there's a way." Maybe build and air box? I put a Holley 470TA on my 225 cid Buick V6. I think a 470 would probably work well on the 258 and 304 as well. Even though it is way too much carb for both 6cyl engines, with a lot of tuning I feel that the 4v performs head and shoulders above my old Rochester 2G. It is not "out of the box performance" like the literture advertises because you're not bolting it onto the engine that the literature advertises, so don't expect to be perfectly satisfied the same afternoon you install; it will take you a few sessions of evaluating your driving habits under different jets, power valves and springs to get it dialed down to your cid.

One of the nicest performance improvements I've noticed is a remarkable gain in fuel economy. Because you can tune the primaries and secondaries independently, I have gone from a miserable 11mpg using the Rochester to an almost unbelieveable, yet fairly consistent, 17-19mpg. That's running 4.88 gears and 33" MT tires! The reliability, instant throttle response, ability to tune the primary and secondary independently, and off camber performance have been well worth it, IMHO.
My '70 CJ5 Build Thread:
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