Head Polishing How-to

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  • Topic: Cylinder head, Poppet valve, Cylinder head porting
  • Pages : 20 (7160 words )
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  • Published : July 24, 2010
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Head Porting for the Do-It-Yourselfer
by the technical staff of Standard Abrasives Motor Sports Division Here’s an interesting head porting fact: In many cases, the greatest performance gain per dollar spent comes upon application of basic porting procedures to a production cylinder head. These basics can be done by any do-it-yourselfer even those with no porting experience–using the Deluxe Porting Kit and the Gasket Removal Kit (part nos. 260001 and 260005) from the Standard Abrasives Motor Sports Division, along with a die grinder and some common hand tools.

It is easy for the do-it-yourselfer to port cylinder heads. All you need is the Standard Abrasives Deluxe Porting Kit, some common tools and some free time.

-1Copyright 1998 Standard Abrasives - All rights reserved - Any unauthorized copying or distribution forbidden by law.

Standard Abrasives Motor Sports Division • WWW.SA-MOTORSPORTS.COM • (800)383-6001 Head Porting Do-It-Yourself Guide

There is a significant difference between basic head porting for a street-highperformance or weekend racer application and the very complex cylinder head work you see in a Pro Stock drag race motor or a NASCAR Winston Cup race engine. Doing full-on race heads requires the services of an experienced cylinder head professional, so Pro Stock, Winston Cup and similar heads are best left to experts. Basic head porting, however, is easy…so easy that even beginning hot rodders The components of the Porting Kit are neatly can do it well.

packed in a compartmented box. There are enough abrasive materials to port a set of V8 Basic cylinder head porting heads.

will improve the performance of any production cylinder head by removing flaws that come through mass production. Basic porting does not attempt to correct any design or engineering deficiencies. Once your porting project turns to that, you’re beyond the scope of basic porting techniques. Why is basic port work important to your engine’s performance? It reduces the restriction in the engine’s intake and exhaust tracts. Reduce that restriction and you let more air into the cylinders. If you have more air, you can add more fuel. The result is increased horsepower. Most of the work in a basic porting project is focused on reducing those restrictions which are caused by: 1) “steps” that may obstruct intake air flow as it transitions from the intake manifold to a smaller intake port entry in the head; 2) casting bumps, ridges or other marks, such as those you may find on port floors or roofs; 3) sharp edges, such as those you will find around the valve guide bosses at the The area of the valve guide that protrudes into the intake or exhaust port is always a point where the intake port floor curves place where sharp edges and restriction to down to the valve seat. flow are found. A basic porting project seeks to smooth those sharp edges. -2Copyright 1998 Standard Abrasives - All rights reserved - Any unauthorized copying or distribution forbidden by law.

top of the valve pockets; and 4) the

Standard Abrasives Motor Sports Division • WWW.SA-MOTORSPORTS.COM • (800)383-6001 Head Porting Do-It-Yourself Guide

Basic porting, while somewhat time consuming, is not hard work. It takes about 10-12 hours to do a set of average V8 heads. Some week nights and a weekend invested in your heads and your basic porting project will be complete. Time is money, so we are not going to tell you doing your own heads will save a lot; however, most professional cylinder head porting businesses will charge $400-$600 for what is sometimes known in the trade as a “street/strip” port/polish job. Your basic porting project, done with the Standard Abrasives Porting Kit, will allow you to spend that $400-$600 on some other performance enhancement you want. A more significant point of restriction is where the intake or exhaust port floor curves down to meet the valve seat. Called the “short side radius,” it is also a place where sharp edges and...
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