Boring over
I know of several 5.3l engines that were bored to 3.90". One of them is running 6lbs of boost in a 4X Yukon. Definitely sonic check the block before attempting to bore it. The other benefit of boring .120" over is that now you can run the car heads with the larger 2.00" intake valves.
Good luck,
Richard
Good luck,
Richard
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Launching!
Joined: Jan 2002
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From: ONTARIO/CANADA
Originally Posted by benpimpin1
Would any performance machine shop be able to do this reliably or will I want ls1 shops?
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Joined: Apr 2003
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From: Albuquerque, NM
I had my block bored to 3.900 with torque plates and sonic checked afterward. Thinnest wall after bore was 0.250", well above the rumored 0.150" minimum. The machine shop was not a LS1 specialty shop ( it was a Bowtie specialty tho ) but the ower/operator definitely answered the right way. Like Richard said this opens up a whole new world of upgrade and performance options with the 5.7 bore, especially since the bottom end crank/rods are the same on LS1, LS6, and LM7-5.3 motors. Be careful, tho, the 4.8 has a different stroke/crank/rod configuration! Else all the GenIII Vortec are standard ubiquitous parts, ie interchangable.
