test test test

My understanding is that was a later feature to speed warm up and get the thermostat open sooner...  It's an M38 late 3A feature as I understand it.

That engine is an RMC M38 crate engine and the hose barb was on the water pump and the bypass hose installed to the industrial head that was on it.  I sourced an "800376" head (correct for M38s) that was originally on a 3A... the 3A head had the flat boss where the barb would go but was not drilled and tapped for it.  I installed the barb, effectively making a 3A head into an M38 head and reinstalled the bypass.

I have no real idea of it's effectiveness as a preheat as my 2A is largely a fair weather animal , but at the time I was trying to keep the m38 theme as whole as possible, minus the 12v conversion.  I could have just as easily (easier) just plugged the waterpump barb

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Lols... late MB on the end and 3A both std bore, SS at 30 over and the block far right is a "T" I think...and probably three more heads in the loft, two of them magnafluxed and surfaced .  The wife thinks I'm nuts, I prefer to say "prepared" 

ETA:  Oh, and the F head just out of frame, and a 231 even fire downstairs.  What I need is more jeeps