289 heads on a 302, what needs to be drilled? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-19-2004, 07:51 PM
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289 heads on a 302, what needs to be drilled?

I know there are better heads out there, I am asking for someone else.


He has a set of 289 heads he plans to install on his 302, everyone says he needs to drill steam holes. Would there be any information floating around the net on this, would any other modifications need to be done? Feel free to get specific on the procedure.


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Old 11-19-2004, 08:41 PM
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289 heads on 302

Its a bolt on job. 302 used the same heads and rocker arm studs up through 69. The only thing to watch for is if they are the interferance push rod holes and whether the rocker arms have rails on them or not. You can not use rail rocker arms on a head with interference pushrod guide holes, or vise versa.
BTW, I have those printouts ready for you on that 418; send me another email and Ill send them to you. I accidently deleted your email about the engine parts.

The interference push rods are harder as well if I remember correctly, to deal with bouncing off the guide hole.
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Old 11-19-2004, 08:42 PM
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If these heads are pre 66 heads make sure to use hardened pushrods for the machined pushrod slot. You will also have to use conventional rocker arms with them unless they are mid 66-68 289 heads, then use rail rocker arms. You will also have to check pushrod lengths, 289 and 302 engines varied depending on which rocker arm they used. This is for stock heads that have not had screw in rockerstuds or guide plates installed. Steam holes do not need to be drilled on these heads. In 1978 Ford changed water jacket designs on intake side, take this into consideration if you plan to use these heads on 1978 and later engines.

Actually Keith, only the 68 4 barrel 302 heads had the 54 cc chambers with the adjustable rocker studs. Most post 68 302 heads were 63cc chambers and had the non adjustable rocker studs. Pushrod lengths and retainers changed again in 1969 to correspond with the nonadjustable rockers. Only the 68 4 barrel heads were common with any of the 289 heads.

Last edited by onebadmerc; 11-19-2004 at 08:51 PM.
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Old 11-19-2004, 09:12 PM
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289 heads on 302

The heads on my 69 302 2-V engine that I had new in 69, had the adjustable rocker arms from the factory. It had press in studs but werent positive stop rockerarms, even with the rails. That was the last year they used the adjustable rocker arms. In 70, or late 69, they went to the positive stop jobs. I have a factory remanufactured 302 in at present which has the positive stop rocker arms, so apparently they made them both ways.

Leftover parts?

The 302 I had in my Mustang was a 2 bbl version, with the 64 cc heads.

Ive also come across this on 69- 70 351 Ws as well.

Hmmmm it appears that a post that I wrote concerning the different pushrod lengths didnt get attatched to this thread.
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