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Author Topic: 66 289 heads on a 92 351  (Read 591 times)
Small Block
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Posts: 140

Location: Dayton Ohio

« on: November 03, 2017, 07:43:23 pm »

I have broken intake bolts in the 92 heads and I do not trust me in trying to get them out so the heads will have to be removed to get it done,I have a set of fresh 66 289 heads and was needing to know is I know both the 302 and 351 used the same heads for some time but what about the head bolts since I think I remember reading the 351s used to have a bigger bolt then the 289/302. Will I have to get the heads drilled for larger head bolts and I presume the 92 motor has dished pistons or will the 66 heads raise the compression too much.
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Big Block
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Location: Pascagoula, MS
The land mass between New Orleans and Mobile

« Reply #1 on: November 03, 2017, 09:04:25 pm »

Open up the head bolt holes to 1/2"  and drill the correct steam holes in the block deck. Neither are hard to do.

Doing more with less, or something like that.

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
Big Block
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Location: ontario canada
...I'm old as dirt (says Lil joe)

« Reply #2 on: November 03, 2017, 09:24:27 pm »


71 Comet, 289,351w heads,RR's,12.5 TRWs,ported torker/750DP, Liberty Top Loader (2.78), 9"/6.00s, tubbed,ladder bars,11.9xs@110 ..bla,bla,bla
84Cougar,88HO,Eddy RPM/700DP, 1.7RRs, shorty's, 8.8/4.10s,T-5/Hurst Pro Billet, K/C clutch...bla,bla,bla

Never shoot your mouth off unless your brain is loaded.   If you're not laughing...you're not living!
Big Block
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Location: West Virginia

« Reply #3 on: November 05, 2017, 08:02:33 pm »

289 heads have much smaller combustion chambers, so big increase in compression.

289 heads use different rocker arm style.  They are either rail type rockers, or the non-rail with the pushrods guided by slots in the pushrod holes.  '92 351W uses pedastal style.  Also uses different pushrod length.

289 heads have steam holes at 12:00.  351W closer to between the cylinders.  Will need to drill either the heads or block.

289 heads do not have hardened exhaust valve seats for unleaded fuel.

Not sure if your 1992 heads have larger ports/valves than the 126cc 289 heads, but there's a good chance they do.

If you want an easy 'factory' swap, look into a set of Ford iron GT40 heads.  They should be more of a direct swap.  Also, nice performance increase, unless you 1992 engine already came with them.

Make sure the mounting bosses on the front of the heads are the same between the two...  and have the same sized bolt holes.

This is all from memory, and I know the the early stuff a lot better than the later 5.0 era heads.

Good Luck!

1966 Mustang, Toploader 4-speed
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Small Block
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Location: Dayton Ohio

« Reply #4 on: November 05, 2017, 10:05:12 pm »

I think I found someone who can get the bolts out but the heads will have to be removed to do it and then I can find out just what they are.
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