Posted by rickyracer (209.20.170.23) on February 25, 2001 at 22:02:02:
In Reply to: Re: 351W Cooling posted by Ken on February 23, 2001 at 21:22:58:
very true that headers generate more underhood heat. I use Thermo wrap on mine and it helps allot. I also use it on a 82 Merc. with a 460 in it. Makes a big difference.
: I'm swapping a 351w into a 1970 that had a 250-6. I'm wondering if anyone has had any experience with using the stock 250 radiator on the 351.
: There is another factor that causes cooling problems in these cars.
: When long tube headers are used they fill up most of the space both sides
: of the engine that would normally allow air drawn in by the fan to pass out
: under the car. The fan then can no longer pull as much air through the radiator
: because of this blockup. In fact it can get to the point that it trys to raise
: the rear of the hood up about an inch in an effort to let the air out.
: A larger radiator will seem to help but often when you get on it for awhile
: when the temp. gets in the high 80s and into the 90s, the gauge starts to get well up toward 200+
: and this show that the cooling is still marginal with an engine bay that is quite small and closedup.