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so far a 3/4 20 thread fits the intake elbow fine, but that project is on hold,,,busted balancer is now being replaced. a m20 1.25 is also very close, both seem to screw in and tighten up, choose which ever off ball ya want, im drilling it out and putting a fitting in for other purposes actually.

not too worried about plugg in the intake elbow, as it is getting filled out and retapped for a pipe thread anyhow. and a bung will be made from an s10 spindle nut

well, the one is definately a metric 18mm, i just used an oil dain plg, the other thread in mine is definately 3/4 20 thread. not metric 20 mm, it does screw in a bit, but is not the same,. i measued the hole and the injector, both 3/4 20 tpi thread for sure

thread for injector is 3/4 20, odd ball crap/ so the elbow will be drilled out to accept a 3/4 pipe plug for now. to screw the injector into the pipe, a spindle nut from an s10 is 3/4 20 thread, use that welded into the stack. spark plug is simply an 18mm thread, going to used a cut down non...

The injector thread is 3/4 20. Odd ball crap. Can't find anything that will just bolt right in. Guess it's lathe time to make a plug and a couple bungs to weld into the exhaust.

well, the spark plug hole thread in the intake elbow is certainly metric.

??????

well, back on this project. went to take all the intake flame heater stuff off this weekend so I can relocate it in the exhaust, just to see how and if it works, also have plans to inject propane and air up stream from the fittings to give it a bit more flame. dunno how well it'll work, or if it...

i believe there is, the trucks name is elmo, 5 ton crew cab its bn a long time, but threads shuld still be here

Preliminary sound readings wit 5 inch stack. Used measuring with decibel meter app on phone. Outside cab at idle 65 1500 rpm outside cab 75 Down road driving on blacktop. Max 80, fifth gear pretty much max speed. Measured in cab. To give a reference, while driving, air horn was only max on...

Sound testing to come later in another thread. It's not welded up yet. Waiting on my v band clap and flanges to show up so I can swap stock vs 5 inch stack. Welders currently broke, waiting on parts, but won't be here til next week after my hand surgery, which will put me down fur a few weeks...

well, 5 inch stack is on, time to take cold srat off and put in in base of the stack,,,for now waiting on new batteries to come in...i hate buying those things!

Well, it makes a flame in the intake, I'm just looking to move it all to the exhaust.

Has anyone tried putting the flame heater in thier exhaust pipe to the flames out the exhaust? Been contemplating how to do it on my 5 ton with Detroit diesel. Then git this deuce with flame heater. Thinking just install it in exhaust and bam...flames. Thoughts?