Slone's Machine and Performance

Slone's Machine and Performance

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Engine Machining, Assembly, Racecar Fabrication and Wiring

04/21/2026

Bryan Cochran brought his SMP-418LS Bracket Engine back for a check up and a little belt driven encouragement!

Alkydigger

Pro Hose Connections

Brian Tooley Racing

Engine Pro

09/12/2025

This week’s batch of engines. Two are ready to start turning on winlights, and one is ready to disturb the peace on any and all Tennessee waterways!

06/11/2025

PSA: Don’t Trust EBAY Parts!

A customer brought in a set of LS heads to be serviced, along with a set of springs to match his upgraded cam. These springs (and cam) were what was recommended by multiple people on Facebook groups - on eBay because they were cheap.

Coil Bind on the springs he provided measured 1.320” which would put the spring into coil bind about .200” before max lift of his camshaft.

We’ll be installing a new Brian Tooley Racing Valve Spring Kit on these heads so these guys can beat on this engine with no worries for a long time to come.

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Columbia, TN
38401