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Yep! All they showed was a 1/4 phenolic for 20 bucks. I would need eight of them to get where I want to be. A little $$$$$$. I did send them a note to see if they had anything else.
I have thought of that, and I did come across some aluminum ones on some flathead site for 40.00 a piece. I just thought this would be a pretty popular item on a Flathead, at least with the speed guys.
That's what I am looking for and that is about as good a price as you will find for something like that. Was about to place an order when I saw New Zealand. Can only imagine how much it would cost to ship here
Unless you need it for clearance, there is no documented benefit to the risers on a street motor. The phenolic are useful for keeping the carb cool if your manifold has heat risers.
A Bone Stock Flathead doing bone stock flathead stuff does just fine with stock components. I might install a phenolic spacer just to ease MY mind.
When you start playing with a flatmotor and are trying to squeeze the 5HP increments out of it then better breathing is a must.
Most of the Hi-Rise - Long Runner ideas came from the Lake Beds of SoCal, NV and Utah.
You have to balance the "plenum" effect vs. the added length of relatively small passages a spacer adds. The extra passage length increases friction so it is actually a restriction at higher RPM's. It MIGHT be noticeable at low RPM's, but I really doubt it. A manifold with a larger plenum down close to the block is a different effect with lower flow losses. Like 4TL8 says, porting for better breathing is the better approach, and a lot more work.
Never used one, just saw them there tonight, when I was perusing...
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Good catch, I looked on E-bay and didn't see anything. They are a little taller than I need but I will watch to see if anyone bids. I don't want to pay a whole lot. The spacer theory on performance is debateable. There are a lot of theories and it depends on the application. I built my motor 18 years ago. Was done on a budget but has been ported/relieved,balanced and compression raised. Cam was reground by Herbert Cams with stock duration and more lift. Keep in mind it's a truck and used to be my tow vehicle. My Dad gave me the manifold years ago and I just never put it on. Since the carb was getting bad on it, I decided to go for it. The main reason I need to space them is for the linkage. The Weiand manifold is quite a bit lower than the original, so the angle of the linkage doesn't provide smooth travel. I found some thick gasket material in my garage and am just going to make a gasket stack for mine for now. Hey my Hudson Hornet's Twin H is factory with several thick gaskets under each carb. Not as pretty as a spacer, but will work.