Gday Rastus, originally, I removed my bash plate when the XJ was first purchased, simply because it was in the way.
ATM, I'm not
really having overheat problems. Just hot.
I have been running a cooler thermostat, 180*F, which over the past 18 months to 2 years has been quite good but, this summer I've noticed the temp creeping up a little more than normal.
Camp Coffs was a breaze in October. A LOT of high revs in low range hill climbs. No temp probs what so ever.
The 'heat wave' days and hot humid days late December and during January were the testers.
Long hill climbs at 60klm/h would see the temp spike to 115 @ the head and 100 - 105 @ the top hose. Normal running is 85 - 90 and 80 respectively.
I'm only taking notice now because it hasn't been hot for quite some time.
First change, I will re install the front bash plate and take note of the running temps.
Another idea I have for bonnet vents is like the old 68 Plymouth Roadrunner, dual side ways scoops. As close to the sides as possible though. I don't want to upset the pressures at the rear of the engine bay. I still want the air flow down past the trans. Hopefully the side scoops won't effect that.
I think I'm also going back to a 195*F thermostat, to keep temps stable. I don't like keeping temps right on the cusp, but I dislike erratic temps more.
Patients will be a virtue with this considering the way I function,
and I shall pray Murphy farks the hell off and leaves me to my devices..
cheers