[DeTomaso] Spark Plugs

[JDeRyke at aol.com]

In a message dated 7/31/10 8:27:22 PM, wkooiman at earthlink.net writes:

> Jack - is there a reason you are running 5/8" reach plugs?
> 
I checked the depth of my SVO A-3's threaded sparkplug hole- which has a 
tapered seat and does not use a gasket- and got 0.625". Then during a tune-up 
I noticed that my wife's aluminum-head Chevy Z-28 engine used such plugs. 
Screwing them into the A-3s on a bench, it appeared they just reached the 
bottom thread, which is proper to prevent carbon build-up. Note these heads are 
date-stamped in the rocker arm chamber: one says '83, the other '84. Later 
ones might be different, I guess. FWIW- J DeRyke