Sunday, January 1, 2012

What kind of spark plugs do I need for a small block chevy with flat top pistons and Edelbrock aluminum heads?

I know I don't need tapered seat plugs but I don't know what is recommend to start with?|||i am running NGK FR4 in my rpm heads. may change the heat range sooner or later, but i like the ngk as they are a bit shorter than the others, similar to the accel shorties and no ordering to get (at least in my area).|||i have been using autolites for years with great results|||AC Delco for the chevy|||I own a shop, and am a firm believer in putting in a vehicle what the manufacture reccomends. Since you are running a higher compression, you will want to go with a colder than normal plug. Example: If the manfacture calls for a 46 then you may want to go to a 45 or maybe even a 44. The heads you are running also makes a difference. You need to know your compression ratio. You may be running flat top pistions, but the CC of the heads will lower, or up the ratio too. The type of ignition system will also apply to determine the heat range that is best for your application. The best thing to do is; contact the manufacture of the plugs you decide to run, and discuss the heat range that would best fit your application. Anytime you modify an engine, the plugs hitting the pistons becomes a reality, so head to piston clearence must be taken into consideration. As I said; talk to a tech with the plug manufacture. I build engines for racing, have a drag car an truck, and know if you don't use the correct plugs, you could cause serious engine damage by installing the wrong plugs, so you are smart to at least question this before just putting in any set. General Motors spends millions of dollars each year on research %26amp; development of their engines, so it is wise to use what they have found to work best. Example: Ford uses a particular brand, Toyota, and Chrysler both use a particular brand, and this is because they have found these to make their engines perform the best. Armed with this information, a wise man would use what has been tested in that particular engine.


Glad to help out, Good Luck!!!|||It's your preference as in the make, I like champions, but you need the flat bottoms with the washer..... I would look up what a camaro uses and that should be good.|||You need to know what the heads has to have.





Most alum SBC heads now days needs a 14mm thread, 5/8" hex, gasket seat, 3/4" reach.





Armed with that needed info, you can go to plug maker's sites (autolite, NGK, etc) and look up the plug #'s, or go over to www.sparkplugs.com and do a search for plugs based on plug info





The for the heat range on the plug.. You need to base that on your compression, cam size, power adders, etc. If you have a low compression engine, you will need a hotter plug.. If you have a higher compression engine you will need a colder plug... The more compression you have, the colder the plug you need

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