Valve pockets

General engine tech -- Drag Racing to Circle Track

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turbo2256b
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Valve pockets

Post by turbo2256b » Tue Jan 16, 2018 12:03 pm

I have wondered how many other heads other than like fords mod motors dont have valve pockets

DaveMcLain
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Re: Valve pockets

Post by DaveMcLain » Tue Jan 16, 2018 12:42 pm

You mean valve reliefs in the pistons? I can think of a few, 318 Chrysler, 440 Chrysler, some Ford 5.0 engines, Oldsmobile 350's, lots of stuff that isn't all that unusual to see.

turbo2256b
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Re: Valve pockets

Post by turbo2256b » Tue Jan 16, 2018 1:34 pm

no i mean the pocket the valve sits in

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Re: Valve pockets

Post by Newold1 » Tue Jan 16, 2018 7:39 pm

I am thinking you are talking about cylinder heads like those on 348-409 chevrolet engines where there is no combustion chamber. the valves appear to be flush with the head surface.

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Re: Valve pockets

Post by roc » Tue Jan 16, 2018 10:47 pm

Newold1 wrote:
Tue Jan 16, 2018 7:39 pm
I am thinking you are talking about cylinder heads like those on 348-409 chevrolet engines where there is no combustion chamber. the valves appear to be flush with the head surface.
Like typical Diesel heads.

turbo2256b
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Re: Valve pockets

Post by turbo2256b » Wed Jan 17, 2018 12:16 pm

i mean the area behind the valve and the and were the port connects to. have always referred to it as the valve pocket

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Re: Valve pockets

Post by ptuomov » Wed Jan 17, 2018 12:19 pm

“Behind” meaning upstream of the valve head, right where the valve seat turns into the port?
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turbo2256b
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Re: Valve pockets

Post by turbo2256b » Wed Jan 17, 2018 4:33 pm

ptuomov wrote:
Wed Jan 17, 2018 12:19 pm
“Behind” meaning upstream of the valve head, right where the valve seat turns into the port?
yes thats the area

Newold1
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Re: Valve pockets

Post by Newold1 » Wed Jan 17, 2018 5:54 pm

I think he is describing the bowl behind the valve backside in the port? I think?

1972ho
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Re: Valve pockets

Post by 1972ho » Wed Jan 17, 2018 7:03 pm

Would this be the area you’re talking about
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Re: Valve pockets

Post by 4vpc » Wed Jan 17, 2018 11:22 pm

I love quizzes, can I have a P please Bob?
There is no S on the end of RPM.

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Re: Valve pockets

Post by midnightbluS10 » Thu Jan 18, 2018 3:23 am

What's the difference between the previously posted heads and these? Visually, they don't seem to be very different. I've seen plenty of people mention doing pocket work on 4v modular heads. If there's "no pocket", what are they referring to?


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Re: Valve pockets

Post by Newold1 » Thu Jan 18, 2018 8:06 am

I'll take a D Bob for Dialect as many of our engine terms sometimes are difficult to translate and use in other parts of the world. :wink:

1972ho
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Re: Valve pockets

Post by 1972ho » Thu Jan 18, 2018 10:46 am

The bowls in these heads have already been ported and cleveland bowls have not that’s why they look a little different.

turbo2256b
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Re: Valve pockets

Post by turbo2256b » Thu Jan 18, 2018 11:26 am

dont understand why this was so confusing. have just pocket ported heads quite often always called it a valve pocket.
any rate wondering about thoughts on last i knew of mod motors dont really have a valve pocket. i know 2 reasons ford didnt but all work i have done with fluid and gases flow were a poppet valve is needed a valve pocket is used/needed to keep from restricting the flow to compensate for the valve.

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