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clinebarger · 11-03-2011, 06:48 PM

5.3L & 4.8L share the same bore, The 4.8 has a shorter stroke. The factory tune in your PCM will run a 5.3L NO problem.

11-03-2011, 06:48 PM	#6
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: 04' silver. 4.8 swap for 5.3 5.3L & 4.8L share the same bore, The 4.8 has a shorter stroke. The factory tune in your PCM will run a 5.3L NO problem.