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mine was great before now not so...ozz



The 340 in my Barracuda would never get hot. Actually most of the time when I cruised at higher speeds it would get cooler. Like if it was just cruising at 3600 rpm and went to 3800/3900 the gauge would go down. I've driven 1600 miles across country at 3800-4000 rpm.

Original pistons, original bore, hone job 70K miles ago. BUT when we did that hone job there was a bunch of scale in the coolant passages. We spend hours and hours with coat hangers and a vacuum removing and picking away scale. Filled up 3 baby jars of scale.

I have a Stock shroud, MP viscous fan, stock radiator, MP.455 cam, stock heads.

Motor was really getting worn in the last couple years (210K miles on OE bore). And was getting some big blow by. And it ate a #6 rod bearing about a month ago.

Only thing that was wierd with my cooling system was that when I put on a new 15 pound cap, it would run hotter. But when I ran my basically shot radiator cap it would run much cooler. Why is that??

When I was driving it across country year ago it had a radiator cap that tested out fine.



It ran this cool about and hour before the rod bearing let go!....