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Spark plug indexing?

Started by indyblue, April 15, 2011, 07:30:57 PM

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indyblue

April 15, 2011, 07:30:57 PM
Is it beneficial to index the spark plugs?
Indianapolis, IN `O=o-
1984 FJ1100, 39K mi., custom blue paint, K&N's, jetted, Supertrapps
2005 Pontiac GTO Impulse Blue M6 - gone
2012 Corvette Grand Sport Convertible M6 Crystal Red Tintcoat
1967 Firebird H-O Conv

SlowOldGuy

#1
April 15, 2011, 09:18:26 PM
On a small block Chevy race motor, yes.  Keeps the piston from whacking the ground strap and losing a cylinder.

It's not necessary on a center plug hemi-like head that the FJ (and just about every other motorcycle) has. 

DavidR.

andyb

#2
April 16, 2011, 07:41:51 AM
On a four-valve head, you'll get gains from indexed plugs, but they'll be so small as to be really, really difficult to measure.  Don't bother, unless you have a specific need for it.
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