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Author Topic: When did the heads get hardened seats  (Read 1183 times)
junkyardjeff
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« on: February 10, 2018, 07:21:10 pm »

I have a 92 351 that I am going to put in my 66 F100,both heads have intake bolts broken off in them and would really like some better heads since they have to be removed. I can get some 70 heads to go with the 70 intake I will be using but not wanting to spend a bunch of money going through them so what year was the first for hardened seats and are those heads just as crappy as the later normal production heads.
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juiced coupe
Six figures worth of don't give a f*ck
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The land mass between New Orleans and Mobile


« Reply #1 on: February 10, 2018, 08:37:27 pm »

Since unleaded gas was a requirement for 1975 year model vehicles, I'd say 1974. But I don't have a definite answer.


If you want good heads with hardened seats, Explorer heads are the way to go.

With the exception of GT40/P and the lame E6 heads, all 289/302 heads flow about the same (give or take a little). But there are huge differences in some combustion chamber sizes. With the exception of 69-74 models, 351 heads are basically the same as those on 302s.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

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. 
junkyardjeff
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« Reply #2 on: February 10, 2018, 08:55:33 pm »

I know the FE heads got hardened seats in 72 but know nothing about the small motors,just trying to find a set of heads from the junkyard that are better then the 92 heads so I will have to check the pull and pays for some explorer heads. Since the heads need to come off time to improve.
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