Got an email from Lindsay Shoemark in OZ. He has finished some new blower intake manifolds for the 471 GMC style blowers. Probably similar to the old Cragar that are nearly impossible to find. Blow off plates on the sides and integral thermostat housing.Will post pics as soon as I can reduce size. Of the pics that is, no hope for me.

http://ford-y-block.com 

20 miles east of San Diego, 20 miles north of Mexico

I got the pictures too so here they are:










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

Wow looks good, any idea on price Chuck?

Glen Henderson



Freedom is not Free

Letohatchee, AL

Now available, high lustre aluminium Yblock 4-71 blower at $975 each

This Ybloke intake is cast from high quality aluminium ingots and has the following features:

1)   Factory Ford 4BBL intake height

2)   All factory hold down points (including either side of water crossover)

3)   Factory thermostat mount and position

4)   Gas threaded pressure gauge port (rear of manifold)

5)   Large plenum with smooth transition to intake runners

6)   Optional - Threaded mounts to allow 4BBL adapter to be fitted to manifold with or without blower

7)   Optional - Single or twin pop-off valves to either side of plenum (allows for adjustment without the need to remove blower)

8)   Optional - adapter plate 'steady' on thermostat housing (for non 4-71 blower applications)

9)   Optional - drilled and tapped mounts for 3-71 blower (requires adapter plate)

The Ybloke manifold has been more that a year in the making.

Every endevor has been undertaken to deliver a quality manifold with features not previously available.

Stocks are limited.

Postage (fully insured), at cost, with a small packaging fee is available.

Paypal or direct bank deposit is available (Paypal fee extra)

Please do not hesitate to ask for clarification on any aspects of the manifold not covered above

WOW, that's cool. Interesting that it has an optional 4 barrel adapter too.

       A  L  A  N   F  R  A  K  E  S   ~  Tulsa, OK    

Not a bad price considering it is a low production part, I think a Hogan fab'ed intake is close to 3 grand.

Glen Henderson



Freedom is not Free

Letohatchee, AL

Am I wrong or does the side mounted blow off plate discharge the fuel/air mixture if you go over your design boost pressure. What keeps this perfectly mixed discharge from exploding when it meets a random spark or red hot header under the hood?

Scares me big time

I believe thats there in case of a back fire.

I never considered that the backfire valve sent a shot of the air/fuel mixture directly out over the engine. I guess a small flash fire under the hood is better than a blower through it? Chuck

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

Nice job, and apparently well designed. Looks like a quality piece.

When one runs a roots style (GM or other) blower, unlike a centrifugal huffer ( EG turbo or McCullough) you have a positive displacement device ( think a rotating piston). As there is a significant volume of air/fuel mixture below the blower, a backfire event can develop enough pressure under the blower to launch the whole shebang through the hood or even through the dyno room roof towards the moon ( I saw the afterwards result once; thankfully not on my shift).

The lakes guys and drag racers discovered this just after WW2, and by the mid 50's blow-off plates or valves were required by most all sanctioning bodies. The design using springs is likely best for street usage as it is self-resetting and most often you just restart and can keep on running. Plates by design must be replaced, bummer for a road machine. The fire out of the plate ends quickly, likely no more than one second unless something else inside broke, and of course ends when the valve reseats. It does get your attention when it occurs. I suggest carrying a spare set of underwear.
WLJ