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post #1 of (permalink) Old 07-14-2003, 12:15 AM
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Head Casting #

I have two different sets of heads for my 350. All 4 heads have 333882 as a casting number. My question is why would one set have 1.94 intake valves and the other have 1.72? I also have a set with the same casting number that came off my truck and one had one size and the other the other size. I was under the understanding that a casting number would have the same size of valves and this is what is confusing me. Can someone please help with this and explain what the difference would be?

Chuck
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post #2 of (permalink) Old 07-14-2003, 04:48 AM
 
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Re: Head Casting #

Those heads were used on both 350 and 400s, the latter using the biggers valves. 882s are pretty good heads, for smog heads. Little port/polish, and they flow good. Look for steam holes between the chambers to the two apart.
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post #3 of (permalink) Old 07-14-2003, 11:21 PM
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Re: Head Casting #

a casting number is just that ... a CASTING number
It has nothing to do with the machine work done to the raw casting to make it a completed head .... it could all sorts of different sized valves put in it depending on application
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post #4 of (permalink) Old 07-15-2003, 01:38 PM
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Re: Head Casting #

So what you are saying is that if I bought 202 valves I could have the heads machined to use them?
post #5 of (permalink) Old 07-15-2003, 02:18 PM
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Re: Head Casting #

Some castings wont take some valves....also some heads with the same casting#'s will take a big valve and some wont.

why do you feel the need for 202's? 194's will flow alot of air for a SBC.....
post #6 of (permalink) Old 07-15-2003, 07:42 PM
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Re: Head Casting #

probably yes ... maybe bigger ... your machinist can tell you
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