A friend is trying to find out what piston he has but nobody around here has the old part #'s,so I'm asking here if any of you would know what comp ratio this piston would be with a closed chamber head.TRW 7052P,for a 350 chev.Tks

I bought a motor from an estate a few years back that had those. From memory,,, those are an 11cc "D" dish blower piston, but you know how the aged memory can be http://www.nastyz28.com/ubb/wink.gif

That sounds like a speed pro number, they used 7000 series numbers. TRW starts with an L then like a 2000 series number. Do you have a pic or possibly a dome height?

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Custom Auto, your source for quality machine work, cores and new parts at competetive pricing right here in British Columbia 1-888-563-4050
A Canadian, EH? (with a 10 second street car)

<font face="Arial,Verdana" size="2">Originally posted by Marv Davis:
I bought a motor from an estate a few years back that had those. From memory,,, those are an 11cc "D" dish blower piston, but you know how the aged memory can be http://www.nastyz28.com/ubb/wink.gif</font>
You must be getting old Marv, http://www.nastyz28.com/ubb/wink.gif they definitely have a dome he said.
Doug I think you're right from what he described it sounds like a .100 dome.I probably could get a picture of it.I was thinking around 10.5/1 by looking at the Speed Pro #'s.

if it's .100 dome thats likely the LT-1 piston, it has a dome volume of 2.4cc's and net a compression of around 10.5:1 depending on head vol, deck height, gasket, etc.

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Custom Auto, your source for quality machine work, cores and new parts at competetive pricing right here in British Columbia 1-888-563-4050
A Canadian, EH? (with a 10 second street car)

<font face="Arial,Verdana" size="2">Originally posted by craggar:
You must be getting old Marv, http://www.nastyz28.com/ubb/wink.gif they definitely have a dome...
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OK, ONE frickin number!! I embarrassed myself so bad I went digging for the old sheet I made for that motor,, P7058A. Craggar at least it's only the very tail end of my memory thats starting to fail. http://www.nastyz28.com/ubb/wink.gif