Part 2: Reading Plugs, pistons, and valves (with Pics)

[Bruce Plecan]

In anything on the street indexing really isn't a HP issue, IMO.
I does give ALOT more uniform plug readings.
The side electrode when positioned just right in a SBC can mask the burn
pattern for 1/2 the plug.
Plugs should be in and out often enough that there is no carbon **build up**
on the exposed threads.  Also, if the head sees and anti-seize from time to
time treats the plug enough for it not to stick with AL heads.  I've even
been known to use a little AS on iron headed engines where the plugs are
changed alot

Also, be advised, AS is an insulator, and when used in excess can cause a
miss
Bruce



> The only thing I have to contribute is that I've read that the plug base
> should be exactly flush with the lowest point of the comb chamber entry.
ie
> there should be no 'thread pit' for carbon to collect in regardless of how
> much male plug threading is exposed on the 'thin side' of the plug hole.
> Indexing with spacers without considering this leaves compeditors who have
> indexed thru plug selection (buy 200, find the ones that thread in PERFECT
> indexed position, sell the rest) with an advantage, however small.
>
>
> ----- Original Message -----
> From: Shannen Durphey <shannen at grolen.com>
> To: <gmecm at diy-efi.org>
> Sent: Saturday, December 02, 2000 5:51 PM
> Subject: Re: Part 2: Reading Plugs, pistons, and valves (with Pics)
>
>
> > I see a problem.  Piston 2 is in the wrong spot!  It should never be
> > between 2 others in a sb chebbie... : )
> > Shannen
> >
>
>
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