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Author
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Topic: 289 C code engine
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MustangGreg66
Journeyman Posts: 19
From: Richmond, CA
Registered: Aug 2005
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posted 08-31-2005 10:12 PM
 
Hello everyone, I'm new here and this is my first post. I have a 1966 Mustang with a C-code 289. Can anyone tell me if there is a difference between the c-code and A or K code in terms of the head. I was wondering if it would be worth it to build up the c-code with cam/carb upgrades and possibly new cylendar heads.I want my car to be streetable, but I would also like to drag it durring the local drag night at infineon. My car is still a long way away from being finished and I'm debating building up the c-code, which i was told was rebuilt by the previous owner about 5 years ago, or going to a new engine like a 351w. Any advice would be much appreciated, thankyou
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MidLifCrisis
Gearhead Posts: 673
From: Frederick County, MD
Registered: Oct 2001
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posted 08-31-2005 10:45 PM
Greg: As I understand it, the A & K motors had a compression increase from 9.3 to 10:1 over the C code. I believe this was a quench chamber head, meaning the space around the valves was smaller than on the C code. The K heads also had threaded rocker studs and narrow pushrod slots. I believe the valves were all the same size, but if I am wrong, one of the other knowledgable people here can correct me. Welcome to the best website on the internet. you will not find a better group of people.
As for a 351W motor, they run stronger than the 289 because of more cubes, but the cylinders are taller because of a longer stroke. This can cause space issues when trying to change plugs or fit headers or even getting the motor nestled in place in your '66. BUT its not impossible, a few guys here have already done it and they can easily help you through it.
If you go with an upgrade, go with a matched set of compatable parts. Most guys here like to build there own. Popular choice is the Comp Cams 270S cam, Performer RPM manifold, and a 600 or 780 Holley with headers and 2.5" duals. With gas prices going up like a rocket, I would stay with a conservative package like the Edelbrock Performer series intake, cam and lifters, but use a Holley 600 vacuum secondary carb. This is my personal preference. Your choice will have to be determined by what you can afford and how much you intend to use the car on the track versus the street. Good luck and welcome. Charlie
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SkinnyMan
Gearhead Posts: 916
From: Tupelo, MS - USA (CA temporarily)
Registered: Jan 2005
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posted 08-31-2005 10:48 PM
quote:
Originally posted by MustangGreg66:
Hello everyone, I'm new here and this is my first post. I have a 1966 Mustang with a C-code 289. Can anyone tell me if there is a difference between the c-code and A or K code in terms of the head. I was wondering if it would be worth it to build up the c-code with cam/carb upgrades and possibly new cylendar heads.I want my car to be streetable, but I would also like to drag it durring the local drag night at infineon. My car is still a long way away from being finished and I'm debating building up the c-code, which i was told was rebuilt by the previous owner about 5 years ago, or going to a new engine like a 351w. Any advice would be much appreciated, thankyou
Greg, WELCOME to M&M.------------------
SkinnyMan
Tupelo, MS Thank you, Thank you very much!
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 08-31-2005 10:59 PM
Welcome to M&M.If you're considering changing heads, you'll be miles ahead of the game with aftermarket. All 289 heads use the same castings regardless of engine they were used on. This includes the heads on the early 302's with the exception of the 68 J code heads. (They have smaller combustion chambers but that's it.) These are very limited in the amount of machine work you can do as well as valve sizing. The same goes for the 351 W heads. Although they do flow better than the 289 heads, they still dont have the potential the aftermarket heads do.
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mustangboy
Gearhead Posts: 1343
From: Ont, Canada
Registered: Mar 2002
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posted 09-01-2005 10:56 AM
The difference in the A-code(4 barrel) and C-code (2 barrel) compression was due to a change in the pistons not the heads.As for what heads and engine to use how fast do you want to go?If you can do some port work yourself the stock heads can be made to work pretty decent.If you have to pay to have everything done aftermarket is a better way to go.------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker...................................................................1966 mustang coupe project.289 4 speed,3.20 rear http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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John Z
Gearhead Posts: 506
From: Morgantown, WV
Registered: Jul 99
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posted 09-01-2005 12:44 PM
If you're really interested in drag racing, I would start at the other end of the car. Nothing wakes up acceleration like a good set of gears in the rear end.
If you're going to swap the cam and heads, it doesn't matter much which engine you start with as you'll be changing the parts that make the most difference.
There is some great info in the tech article section, covers the engine swap and building a 289/302
https://mustangsandmore.com/ubb/Archives.html
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