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I need to install the fittings on my intake (Edelbrock Air Gap) for the heater hose and the vacuum line for the power brake booster.
Looking at the heater hose fittings, I came across the B302 style with the built in flow restriction.
What's the purpose of restricting the flow to the heater core? I don't plan on driving my car in the dead of winter when the roads are crappy, but I would like heat for the fall and other cooler times of year.
Should I run this fitting or a basic 90 degree hose fitting with no restriction?
Also, does anyone know off hand what size fitting I need for the vacuum line for the brake booster and what size vacuum hose I need? I've got the smaller MS fox body booster on my car.
Thanks!
Last edited by Chaplin (1/19/2019 8:11 AM)
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The restrictors for the heater hose are to keep from puking the heater core when you take it to red line between the gears. The 5.0 is notorious for overloading the heater core. I made restrictors for our 66 after having a 90 GT with a bad heater core and also having one crap out in the 66. The heater still makes enough heat to run you out of the car.
Brake booster vac hose is normally 3/8" IIRC.
BB
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3/8" for the booster for sure.
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Thank you both!
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As an alternative, you can get this in-line restrictor. I believe it is for 3/4" heater hose, but as it is of some plastic material, can be ground down to fit 5/8" heater hose.
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Bullet Bob wrote:
The 5.0 is notorious for overloading the heater core. I made restrictors for our 66 after having a 90 GT with a bad heater core and also having one crap out in the 66.
BB
Is that problem only with the 5 oh's, or do early small blocks suffer from it too?
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I've never heard of it on the early cars, and in truth have only heard of it recently on the 5.0s. I'm wondering if its one of those things that people say you have to do that you really don't. Don't get me wrong, changing the heater core on a 5.0, especially one with AC, is a royal PITA. But, does the flow through the core really contribute to heater core failure? Thus, does that restrictor really improve heater core longevity?
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Well...I bought my 90 GT from my brother in 09 with 154K. My bro told me that the AC compressor had swallowed itself a few years prior and that the last time he drove it to work...about five years prior...getting on the freeway required a little throttle and that at the top of second gear the heater core puked all over the right footwell.
So I don't know. Would that have happened if the core weren't 14 years old? Don't know. Butt, the restrictors shouldn't hurt, and might save you some grief, I would think.
BB
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TKOPerformance wrote:
I've never heard of it on the early cars, and in truth have only heard of it recently on the 5.0s. I'm wondering if its one of those things that people say you have to do that you really don't. Don't get me wrong, changing the heater core on a 5.0, especially one with AC, is a royal PITA. But, does the flow through the core really contribute to heater core failure? Thus, does that restrictor really improve heater core longevity?
I'd never heard of it early cars either. I just went back and took another look at all of the heater hose fittings listed on CJ's website and it appears that restrictors were only used on B302s, so perhaps Ford looked at the expected rpm range as the determining factor for when to use them.
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That would make sense. I remember Smokey Yunick talking about accessory speed at racing speeds in his book, and a picture of a small block chevy with a water pump pulley that looked positively huge.
To my knowledge though the 5.0s never used those restrictors stock, possibly the police package cars did, because I think they had a heavy duty cooling package.
Most of the 289s/302s were 5,000RPM engines, except for the HiPo 289 and the Boss 302. But the 5.0 would turn past 6,000RPM (factory rev limiter was 6,250). So, IDK. I'm planning to run one on my '89 GT because I hate changing heater cores in those cars and the 331 will easily wind to 6,500RPM. Of course, with the amount I'll actually drive it I'd probably need to live to be 500 to tell if it made a difference
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