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American Motors/304 year changes
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Question
I have a 1979 304 in a cj5. I understand that the 79 engine has about 30 horsepower less than the earlier 70 models. What can I do to increase the horsepower to the earlier ranges or higher?
The engines in 1979 sufffered from Uncle Sam's involvement. Emissions. Different cylinder heads were the biggest item changed lowering compression;
ALong with EGR valves and 3 miles of vacuum hoses running to different valves.
Though you will not get back to the "Brake Horsepower" days, you can always do the basic.
1) A good valve job
2) Aluminum dual plane manifold
3) 600/650 cfm carburetor
4) A good high torque cam
5) Tubular headers with low restriction mufflers
6) a good distributor with maybe MSD box
This will give you plenty of power for your CJ.
Of course, if you have the money, you can have the horsepower.
How much do you want to spend?
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Kevin Pilotte
Expertise
I can answer many technical questions relating to AMC vehicles prior to 1979. I also have experience with Rambler & Nash vehicles.
Experience
I am a former AMC technician, service writer and service manager. I have worked in AMC dealers in Illinois in the 70's. After college, I was a Field Service Rep for American Motors Sales Corporation, working out of the Chicago Zone office. I traveled to AMC dealers assisting in the diagnosis and repair of AMC vehicles. I was also the Area Training Manager for DeLorean Motor Company. I have 10+ years as an Automotive Instructor. I have modified and restored
numerous AMC vehicles. I have been working on AMC vehicles for over 30 years.
Organizations
I have been an ASE Certified Master Technician since 1975. This includes L1. I am also currently a Toyota Certified Master Diagnostic Technician.
Publications
I have articles in "American Motoring", the official publication of the American Motors Owners Association. They are the largest AMC club in the world.
Education/Credentials
I have a certificate I printed out from a website.
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