spark plugs

KJ kyle · **Posted:** Sun Jan 25, 2009 3:57 pm

how do i choose spark plugs for a motor i just built with basically all aftermarket parts?

InCommando · **Posted:** Sun Jan 25, 2009 4:08 pm

Most aftermarket parts ( pistons/heads/etc...) are designed around the factory plugs and should say you need a shorter reach plug if they do not use the factory plug.

Every engine I have had with aftermarket pistons, even the 11:1's, used the stock reach plug.
If you have doubts, you should check with the various manufacturers of the parts you have.

XR · **Posted:** Sun Jan 25, 2009 7:12 pm

Run whatever is recommended stock-GENTLY.Then read the plugs and go from there.What engine are we talking about?

KJ kyle · **Posted:** Sun Jan 25, 2009 8:27 pm

chevy small block 383 stroker. 9.5:1 hyperutectics, 2.02 / 1.60 heads cast heads, .484 lift cam...

InCommando · **Posted:** Sun Jan 25, 2009 8:35 pm

Unless you used aftermarket heads and they specifiy something else, plain ol' small block plugs are probably where to start.

TAHOE · **Posted:** Sun Jan 25, 2009 9:23 pm

You may want to run a cooler plug, one step below stock maybe. Stock plug should work fine unless you used after market heads. You can always bring #1 up to TDC, put some type of marking pencil/wax/etc on end of plug and screw in, then remove and see if there is marks on end of plug and top of piston.

XR · **Posted:** Sun Jan 25, 2009 10:36 pm

Colder plugs are NOT for tuning.Since you still have a cast iron head go with a quality plug in the stock heat range.

spark plugs

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