<VV> Re: THERMISTOR IN A 110 etc NO NO NO NO

[JVHRoberts at aol.com]

You CAN drill these, you simply have to make sure you don't drill any  deeper 
than necessary. Given that the castings between SOME turbo heads and  their 
NA counterparts are shared, the meat is there in the casting. I've done  this 
bunches of times, no sweat. 
The best way to make sure you don't drill too deep is to wrap the drill bit  
with masking tape, leaving the same length of bit exposed as the length of the 
 thermistor. Drill until the tape meets the shoulder of the hole. This WILL 
work,  and you WON'T drill into something you shouldn't. Just exercise due 
care. 
 
In a message dated 1/3/2006 2:57:36 A.M. Eastern Standard Time,  
N2VZD at aol.com writes:

do not  drill the 110 or other non spyder heads for a thermistor, you WILL go 
into  the combustion chamber!!!!!
i know this from watching someone make that  mistake many years ago (me!)
get an adapter and get used to normal  readings. they may be slightly lower 
than a 140 or spyder .  i would  consider a snowmobile or aircraft setup with 
the 
thermocouple that goes  under the spark plug if you really need head temp.  
or 
give it up and  put a voltmeter in the hole.
regards, tim colson