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Old 04-10-2019, 12:00 PM   #4
webfoot
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Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
Re: LS transmission questions and other Ls stuff.

A 5.3 will also bolt right up to your th350, FYI. You will just need a different flexplate, and advance adapters sells these.

I'd go over your swap build carefully and price out how much the build will cost for a gain of 7 mpg max.
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1968 GTO 4-spd covnvertible

1970 K-20 4-speed, factory AC.
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