.34 has good response you could even go a little tighter
I do believe it's 34. That's what I was told by my local auto parts store.
.34 - .37 is optimal any more than that you'll have to replace them more often.
A sp-34 spark plug to a Champion plug is a small engine spark plug. They can be used for lawnmowers and weed eaters among other things.
The 250 Chevy I6 was not installed in the 1965 Chevy and did not come out until 1966. However here are the specs for the 250 which someone may have installed in this truck. Spark Plug Gap - .035 AC plug 46N Point Gap - New .019 Used .016 Dwell Angle - 31-34 Timing - 6 degrees BTDC Firing Order - 1-5-3-6-2-4 If you have the 230 Chevy I6 which is what was installed in the 1965 then the spec on it are. Spark Plug Gap - .035 AC plug 44N Point Gap - New .019 Used .016 Dwell Angle - 31-34 Timing - 4 degrees BTDC Firing Order - 1-5-3-6-2-4
Spyder Games - 2001 1-34 was released on: USA: 3 August 2001
SP-34 is the number of an aftermarket spark plug available from Arnold. It should cross-reference to a Champion RJ 19LM.
34 miles
UFC 34 High Voltage - 2001 TV was released on: USA: 2 November 2001
House Hunters International - 2006 Grand Living in Grand Cayman 34-7 was released on: USA: 15 March 2012
12-16 thou gap and 34-36degree dwell angle for HR.
Ya mum