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===Full roller=== | ===Full roller=== | ||
| − | [[File:Jessel mohawk AFR ford windsor.jpg|thumb| | + | [[File:Jessel mohawk AFR ford windsor.jpg|thumb|250px|Jessel full roller rockers on a Ford Windsor engine]]Aftermarket rockers are available as full roller (tip ''and'' trunnion). The benefits are less friction and less oil needed to lubricate them. While these used to be considered high-end race-only parts, the price has dropped to the point where a set of decent full roller (tip and trunnion) can be had for not much more than a quality set of stamped steel rockers. |
<br style="clear:both"/> | <br style="clear:both"/> | ||
===Self aligning vs. non self aligning=== | ===Self aligning vs. non self aligning=== | ||
[[File:SA vs non sa rockers.jpg]] | [[File:SA vs non sa rockers.jpg]] | ||
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| + | ==Converting a non-adjustable valve train== | ||
| + | Old and new engines have both used net lash or non adjustable rocker arm arrangements. The latest Chevy engines are now among these; for years the Chevy V8 enjoyed the benefits of an adjustable stud-and-rocker setup but unfortunately that's gone by the wayside. | ||
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| + | The aftermarket has seen to it that there's the wherewithal available to get adjustability back into these engines. | ||
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| + | ===LS series engines=== | ||
| + | The LS series Chevy engines are becoming the new "go-to" swap engine, rapidly gaining ground on the original Gen 1 SBC. One stumbling block to doing cam swaps and modifying these engines for high performance use is the non adjustability of the net lash system now used by Chevy. | ||
| + | [[File:Ls adj valves.jpg|right|300px]] | ||
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| + | The original rocker arms have a roller trunnion and a non roller tip (shown above at '''Roller trunnion'''). They're not a bad rocker arm, in fact there are kits to allow them to be used in an adjustable setup, and there are replacement roller trunnion/bearings for them that allow the stock rocker to be used more reliably in high performance applications. | ||
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| + | If an aftermarket roller trunnion isn't enough, Crane (right) and others have made rocker arm/adjustable valve train conversion parts available. | ||
==Lewis tool== | ==Lewis tool== | ||
| − | [[File:Lewis tool in use.jpg|thumb|500px|Lewis tool being used on a SBC head]]A Lewis tool is used on SBC heads to lengthen the pushrod slot towards the rocker stud for use with increased ratio rocker arms. This can also be done by hand using a die grinder or even a rat tail file, but the Lewis tool makes short work of it by using the tool, a 5/16" drill bit and drill. <br style="clear:both"/> | + | [[File:Lewis tool in use.jpg|thumb|left|500px|Lewis tool being used on a SBC head]]A Lewis tool is used on SBC heads to lengthen the pushrod slot towards the rocker stud for use with increased ratio rocker arms. This can also be done by hand using a die grinder or even a rat tail file, but the Lewis tool makes short work of it by using the tool, a 5/16" drill bit and drill. <br style="clear:both"/> |
{{develop1}} | {{develop1}} | ||
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