Head temp differences, How big is too big? Options

[lapuwali]

I recently fit a CHT gauge, and originally put the sender under the #4 plug. Readings were in line with what I've read here: idled at 300dF, cruised at 325-350dF, touched 400dF under heavy load (lots of long uphill grades here).

I moved the sender to the #1 plug yesterday, and the temps are as much as 50dF lower across the board. Idles at 250dF, cruise about 300dF, never exceeds 350dF even pulling up a long hill.

I expected a difference, but not 50dF (20%!) between heads. I'm running Webers, so it's possible I have completely different mixtures for each cylinder. I presume cooler head temps would usually mean richer? This would be in line with plug colors (blacker on the 1/2 head, tanner on the 3/4 head). Hmmm....

[dmenche914]

I'll be getting head temp senders on mine, all four of them, still need to get the engine in the car, but I am cripples right now, maybe in a few weeks.

Temp seem to be typical from what i have seen on Bug motors.

Question: How did you install the sender, did you remove any aluminum around the spark plug hole to allow space for the sender? i did on mine.

Also: Jake, is this new fan shroud design for a stock installation (will it fit with 2 liter factory FI)???

And how bad is the type IV stock system, how uneven is the cooling?????

dave