Mummert's intake may have an edge in performance vs the Blue Thunder, however the Blue is more original looking, which may matter to some & it has  under carb heat crossover, that Mummert's doesn't..  Another route for some, particularly if originality is important, may be to find a good condition '57- ECZ-B intake (at a reasonabale price) & if you have a Die Grinder, small metal cutters, epoxy & course long strips of sandpaper belt to remove the sharp corners into the runners & some time & patience, it can be modified to work better than stock. I believe that route has been described here some & also in Y-Block magazine  some time  ago. I did one about a year or more ago. It takes about 8-10 hours over a couple of days to do it.. Note; that the heat tube in the crossover is often rusted out in old intakes & will need replacement if you plan to use a heat style choke feed... 
N.B.- the article on porting a "B" intake, by Doug Thrasher, is in Issue #140, May-June 2017..   


Paul

😉👌

I found the thread about the ridges in the plenum floor, http://forums.y-blocksforever.com/Topic133974.aspx

More info in May - June 2018, Vol 25, No. 3, Issue 146 of Y-Block Magazine.


Lawrenceville, GA

thanks, I'm waiting for a reply

I have a new Blue Thunder manifold that I bought about 10 years ago and never installed.  I will sell it for $400.00 plus shipping.

That's true. John is often behind on his stock of parts. Part of dealing with the person that has them made. If you are waiting for parts you may have to go to Blue Thunder or get lucky and find a used one.

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

There are no Blue Thunder Manifolds available on Ebay either. Seller sold 5 recently.

  

I have nothing against, the issue is that it has been over a month without stock of intakes and they do not tell me a specific date to have it and I have a lot of material waiting for shipping ....

the exhaust passage is a must hear in bc/ canada. have a 57ford manifold 4v, holley runs great sept to june, summer i ty the heat riser open no cold start bogs
se a elect choke. the blue thunder would be my choice,but the ford manifold works great

Performance wise, Blue Thunder and Mummert are very close, with the Mummert intake possibly having the edge.

Blue thunder do make improvements.  They got rid of the slot in a more recent version and it sounds like they may add dimples or ridges on the plenum floor, soon.

In this thread, you can see an earlier version with the slot, http://forums.y-blocksforever.com/Topic133096.aspx.
Ted wrote an article in the last year or two testing a Blue thunder modified with dimples and without the slot.  I can look at my issues to see which but Ted might know right away when he sees this.  With that mod, the two intakes are extremely close.

One possible benefit of the Blue thunder is the inclusion of the exhaust passage under the plenum, which may be beneficial to those in cooler climates.  That also may contribute to the additional expense - more aluminum and probably more complex tooling.

I do see used Blue Thunders on eBay once in a while, sometimes priced very reasonably.


Lawrenceville, GA