max valve size on 1962 small block heads?

blackstallion12

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Dec 13, 2009
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I have a set of 62 heads that i might be rebuilding in my class and i was wonering what is the largest valves i can install? I saw on ebay some guy put 194s in a set but i thought that was too big. i know i can get away with at least 174s but i would like to go as large as possible. the heads are off of the 221 or 260 motor. im not sure which one but they have very small valves... i think like 164s and very thin valve stems. just let me know what you think.

thanks
 
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D.Hearne

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That would depend on what motor you're putting them on. The 221 (3.50") and 260's (3.80") had smaller bores than the 289/302 (4.00") If you're just experimenting with these heads and not using them on a 221/260, then that's really a shame to ruin the heads, they'd be worth something to someone who had one of these engines.
 

68stang351

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That would depend on what motor you're putting them on. The 221 (3.50") and 260's (3.80") had smaller bores than the 289/302 (4.00") If you're just experimenting with these heads and not using them on a 221/260, then that's really a shame to ruin the heads, they'd be worth something to someone who had one of these engines.
+1.

It would be a shame to ruin any 221 parts. They only made that engine for 2 years, 62 and 63.

As the owner of a 63 Fairlane with a 221, I am now finding how just how difficult it really is to find some of these parts.
 

blackstallion12

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what would bore have to do with anything? would larger valves hit the cylinder walls? also im not "experimenting" thats why i was asking a quetion so i dont ruin these heads.
 

D.Hearne

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what would bore have to do with anything? would larger valves hit the cylinder walls? also im not "experimenting" thats why i was asking a quetion so i dont ruin these heads.
Yes, if the valves come far enough down, they'll hit the bore. Especially on a 221. Lesser so on a 260. Installing larger valves will ruin their value. Put em on ebay if you get no offers here. If you want heads with bigger valves, then just get a set of 65-up small block heads.