Hayward and Scott 914-6 Heat Exchangers, Fitment Issues Options

[bluhun]

I purchased a set of the Hayward and Scott heat exchangers for my 1975 3.2 liter conversion several months ago. The conversion was performed 5 years ago and designed around the Billy Boat heat exchangers and muffler system. I was not happy with the B&B system because of the inadequate flow of hot air it delivered, and decided to give the H&S system a try. Attached is a picture of the H&S heat exchangers.

Unfortunately, and not surprisingly, we encountered significant fitment issues with the H&S heat exchangers. First of all, the exhaust primaries would not bolt up with the cylinder heads without enlarging the bolt holes on the exhaust flanges. Not a big issue, just enlarge the holes. The hot-air exit tube on the exchangers needs to be extended by several inches to bolt up to the heater-control valves. The collector end of the exhaust would not mate up with the B&B muffler, necessitating the purchase of a standard 911 banana-type muffler.

The most significant fitment issue, however, is that the system interferes with oil changes and exhaust-valve adjustments, requiring the exhaust to be removed in order to do an oil change or an engine service.

We reluctantly decided to retain the B&B system for the car, and new heater-control valves did significantly improve the hot-air flow. All-in-all, this has been a very expensive lesson.

The H&S exchangers come with 1-3/4" primaries and a 2" collector. The driver's-side comes with an O2-sensor bung installed. I am willing to sell them for considerably less than I paid for them ($2,900 including shipping). I will be posting an ad in the classified section.

[Cairo94507]

I am so sorry to hear that! I had identified those as the most likely heat exchangers for my car. But as I am putting a 3.2 in my car I would face the exact same problems. Pulling the heat exchanger to change oil is not going to work for me. So it looks like I am back to my stock heat exchangers with heater valves that are in the best possible condition to make sure I get heat.

[mepstein]

I am so sorry to hear that! I had identified those as the most likely heat exchangers for my car. But as I am putting a 3.2 in my car I would face the exact same problems. Pulling the heat exchanger to change oil is not going to work for me. So it looks like I am back to my stock heat exchangers with heater valves that are in the best possible condition to make sure I get heat.

If i had stock HE's, I would run them. Maybe you loose 10-20 hp at wot, doesn't matter, with your engine, you are still spinning the tires at will. factory fit is still best. NOS flapper valves are available for less than $200/pair. I would ceramic coat the he's.

Thank you to the original poster for an honest review.

[scotty b]

I am so sorry to hear that! I had identified those as the most likely heat exchangers for my car. But as I am putting a 3.2 in my car I would face the exact same problems. Pulling the heat exchanger to change oil is not going to work for me. So it looks like I am back to my stock heat exchangers with heater valves that are in the best possible condition to make sure I get heat.

Thank you to the original poster for an honest review.

(IMG:style_emoticons/default/agree.gif) This kind of feedback will save several form wasting their money. It is a shame no one makes a good set of exchangers,. As noted, one would think the demand must not be there, BUT at least 2 companies thought there was enough demand to put out for the tooling to make these poor fitting sets, so how bad could it have been to make an authentic reproduction in S.S. (IMG:style_emoticons/default/confused24.gif)