Robert, The first thing one needs to know is how the engine is to be used. There is a huge difference on how the engine components are combined to work together from a street motor to a race motor. Remember that it is the combination of all components of the engine, transmission, rear gear ratio, vehicle weight, tire size, and more that will determine the best combination for any given application.
That being said, I will assume you want to get a bit more street performance out of this motor. The most important things you can do is to get the engine to breathe better. This means intake and exhaust. A good dual plane manifold would help over the stock one. I think the Qjet carb is a good street carb, but probably not the right one for your application. All Qjet carbs were 750 cfm, except for some made for Pontiac, which were 800 cfm. The spread bore design makes them very versatile, but still to big for your engine. A better choice might be the Edelbrock Performer 500 cfm carb, or a small 400-500 Holley. Over carbureting the engine will hurt performance. On the exhaust side, headders will really help the engine breathe better. They should be used in combination with a properly designed, free flowing exhaust system. Headders can make working on components in the engine bay more difficult, due to their size and routing. The only headders that I would even consider today, are either stainless steel or ceramic coated. I really like the Jet Hot coating, but HPC makes good coatings, too. As for camshafts: The first rule is to not go too big. Over camming will only hurt performance on a street engine. The cam should be selected by knowing a lot of vehicle factors like: vehicle weight, rear gear ratio, engine compression ratio, transmission, torque converter stall speed on automatics. Any of the cam manufacturers will be happy to recommend a cam for your particular application. As a very general rule, I would keep the duration @ 0.50 lift to under 216 degrees. This will probably be a cam with an advertised duration of around 268 degrees. The cam manufacturer should really be consulted after you have decided on all of the other factors, for a recommendation. You will need a very good ignition system to make sure all of the fuel gets burned efficiently. There are a lot of good ignition components on the market. I hope this gives you a few ideas and things to consider as you go along. ----- Original Message ----- From: Robert J. Moore To: Blind Handyman Sent: Saturday, October 28, 2006 4:40 PM Subject: [BlindHandyMan] building up an engine I have an extra 4.3 v6 which runns fine. I would like to build it up and put it in my s10 I don't really want to go to extreems. I am not looking to over size the cilenders because of the extra cost of having them board out and the cost of new pistons and rings. A couple of things I am thinking about are going to a an Edel brock intake and switching to a carborator. Probably a quadrojet because unlike the Holly once it is set up it is pretty low maintanence. other thing I am thinking is an over sized cam. What all else needs to be changed when you put in an over sized cam, if any thing. . what about headers? Will they give me any thing more than a lighter wallet? What else have i overlooked? ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.11/493 - Release Date: 10/23/2006 ---------- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.11/493 - Release Date: 10/23/2006 [Non-text portions of this message have been removed] To listen to the show archives go to link http://acbradio.org/handyman.html or ftp://ftp.acbradio.org/acbradio-archives/handyman/ The Pod Cast address for the Blind Handy Man Show is. http://www.acbradio.org/news/xml/podcast.php?pgm=saturday The Pod Cast address for the Cooking In The Dark Show is. http://www.gcast.com/u/cookingindark/main.xml Visit The New Blind Handy Man Files Page To Review Contributions From Various List Members At The Following Address: http://www.jaws-users.com/handyman/ Visit the new archives page at the following address http://www.mail-archive.com/[email protected]/ For a complete list of email commands pertaining to the Blind Handy Man list just send a blank message to: [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/blindhandyman/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/blindhandyman/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
