Re: Holley EFI Coolant temp location
It's not advised. That port is a deadhead so there is not constant coolant flow. It think it is designed so that you could install a crossover pipe between the two rear ports. I would put it in the head if the harness will reach. I run mine in the front intake with a bushing (1/2 to 3/8 NPT). The only thing I don't like about it is that the intake warms a lot slower than the head/combustion chamber so setting up my cold fuel enrichment was a pain. My cold fuel settings affect the entire fuel map so when they were right to get it warming up at idle they were way too rich if trying to drive off so it would rich misfire like a beeyotch. But, on my unit you can change all that stuff it just took time and I had to figure in some offset and have all extra fuel kick out by the time the intake came up to 100 degrees instead of 140 degrees which was stock setup. Sorry, just rambling.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled