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different ports on 5.3 5.7's right?

This is a discussion on different ports on 5.3 5.7's right? within the GM Trucks forums, part of the Vehicle Specific category; Ok whats all of this talk about swapping 5.3 heads on 5.7's and 5.7's intakes on 5.3's I thought the ...

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    different ports on 5.3 5.7's right?

    Ok whats all of this talk about swapping 5.3 heads on 5.7's and 5.7's intakes on 5.3's I thought the 5.3's had different ports and the new LQ's have the car ports. Are people mismatching or doing major surgery or what.

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    Senior Member bills98ta's Avatar
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    I'm doing a set of 5.3 heads for my 98 5.7 now ! Small combustion chambers for high compression. You need to port the intake & exhaust runners & have the 2.02 / 1.6 valves machined in, and then you have one mean set of heads !!!

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    Quote Originally Posted by crawdad369 View Post
    Ok whats all of this talk about swapping 5.3 heads on 5.7's and 5.7's intakes on 5.3's I thought the 5.3's had different ports and the new LQ's have the car ports. Are people mismatching or doing major surgery or what.


    r u sure that you're not thinkin about the gen II 5.7's??? Cuz the LS style 5.7's interchange w/ the LQ stuff fairly easily.

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