Fourth-Gen LS Engine Swap - Finance-Friendly 408, Part 4

Our homegrown iron-block mill finally finds its way under the hood of a project car

Chris Werner Jul 1, 2011 0 Comment(s)
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Am I getting lazy in my old age? Perhaps. Even if I were, it doesn’t explain why an engine swap that began last summer took eight months to complete. Other, more tangible reasons factored in, like being in graduate school 500 miles away. And, as mentioned in the brief project update last issue, I screwed up the clutch installation and rendered my Trans Am non-shiftable, which accounted for a large part of the holdup. More on all that in the photo captions.

Ghtp 1107 01 Fourth Gen LS Engine 2/26

This story is intended to show the general details of an engine swap, and points out a few of the more critical things that are good to know when installing an iron block and/or Gen IV intake in an F-body. A refresher on our engine’s specs: LQ4/LQ9 iron block, K1 Technologies forged crank and rods, forged Wiseco pistons, GMPP CNC-ported L92 heads, 11.0:1 compression, 408 cubes. You’ll find more specs in the photo captions, but see the first three installments of the story series in the August 2009, September 2009, and August 2010 issues for the nitty-gritty details; all three are also available on And be sure to check out the conclusion section below for info on our friends at Tune Time along with final thoughts on the project.




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