B B M HEADS

[CaptCobrajet]

I've got some flow numbers on the BBM head.  I did what I'd call a ".600 lift" valve job on the head.  I figure a guy with more cam than that is going to port the head anyway.  I try to do whatever I do to a head with the end-use on my mind.  I approached this test with a street to street/strip flat tappet or hydraulic roller on my mind, with a max of .600 to .650 lift and a minimum of .500 lift.  I measured the throats, and a 2.15/1.600 combo will clean up in the bowls with a reasonable throat percentage.  I had some nice 2.20/1.65 stuff here on the shelf, so I did my work with the latter.  I sized all of the guides in the head while I was at it, and it took about fifteen minutes to get within .0002 of where I was going.  It will take another 15-20 minutes to get them to finish size.  They worked like everyone else's guides that I do the same work to.  Carbide is a wonderful thing on manganese bronze.  I did the valvejob, and I left the throat fairly small for a 2.20 valve..........just enough to kiss the aluminium under the seat ring.  No grinding in the bowls at all.  I did blend slightly on the short side.........again just enough to remove any mismatch as the short turn breaks over..........say from about 4:30 to 7:30 of the circle, just on the short turn side, right at the bottom of the seat ring.  Nothing was done on the exhaust underneath the valvejob, except a touch with a 80 grit roll just to knock the machined edge off at the bottom of the seat ring, on the short side.  I did a slight blend right at the spark plug on the top side of the intake seat.  It took nine minutes to do the extent of the "touch up" on one cylinder.

I flowed on a 4.200 bore plate.  Looking underneath, the chamber will not be unhappy on smaller bores.  There was a noticeable "ledge" so I'm sure a stock 390 bore would be just fine with the as-cast chamber.  The valve spacing also allowed the 2.20 valve plenty of room on the cylinder wall side of the chamber.......I don't see any problem using the 2.20/1.65 combo on a 390 bore.

Intake:

Lift                   Flow

.100                    90
.200                  157
.300                  212
.400                  254
.500                  282
.600                  288
.650                  292
.700                  295
.800                  300



Exhaust:

Lift                 Flow

.100                    77
.200                  124
.300                  165
.400                  190
.500                  210
.600                  225
.700                  230
.800                  235      (no pipe.......just blowing right out of the head)

[Barry_R]

To simplify things a bit
I tweaked the layout & rounded the numbers to make them comparable - but have not materially altered any of them.

I will leave comparison to my heads up to you guys - the data is out there.

[cjshaker]

Very good informational posting by all you guys. Thanks for all your efforts.

Obviously they respond pretty well to bigger valves with little to no work, especially those exhausts! Blair is past the 70% rule with barely a light touch-up. And Joes numbers show they would be easily useable in about any mild street build with just basic valve jobs. Should get really interesting as things get opened up to see their full potential. Great stuff.

[CaptCobrajet]

I was using some pretty spiffy valves also.  The exhaust valve is a combo I have been tweaking for a long time.  Valve shape can make a huge diff in the middle of the range on the exhaust side, but that is one nice exhaust port for an as-cast part.

[bn69stang]

Great feed back Blair , Joe , Brent , Barry i know i appreciate all your efforts , as do the all the others and Rob McQ thanks for the phone calls and emails and info on the heads . Ready for a road trip to Denver ... Bud

[blykins]

Joe, did you do any seat blending with the small valves or did you just do a valve job and flow them as-is?   I used a set of Manley valves on the head that I posted the numbers for.  I also used a 50° angle on my set, which explains the better flow up top and the worse flow at lower lift numbers.   These were very quiet on the bench.

For giggles, this is how the head looks on a standard bore 352 block with a 2.09/1.6 pair:

[Joe-JDC]

No, I did not blend the throat, I wanted to simulate a typical multi-angle valve job from any machine shop, and find the results for a specific valve size.  I will go up in sizes, and blend the throat at the size used by BBM and Blair, to see if the heads will be repeatable by different shops.  Personal attention to detail will always increase the flow when done properly, I was just keeping the heads as received from a typical shop for testing.  When I get to the final size for valves, I will flow the heads, and then port them and re-flow to see what difference the porting will make.  I suspect they should respond well, but whatever I get, I will post.  Joe-JDC

[ScotiaFE]

Well I got my set now.
They come really well packed in one box.
First thing I noticed is they are drilled and tapped on both ends.
This will be a great thing for mounting with front engine mounts.

[bn69stang]

Ok forum members i am heading to Denver to Rob s shop , blue oval performance to pick up my heads , and i will post flow numbers , and any other info when i return home . Looking forward to meeting Rob , see ng his shop and projects .. Bud

[sumfoo1]

So we'd want blair's exhaust and brett's intake?

lol


Barry aren't your numbers quoted without any port work too ?

[Barry_R]

I have posted flow data in a couple places with normal valve job & blend.  For third party comparisons Joe Craine has posted flow numbers on my heads with basic valve job, with different valves, and with a couple levels of port work on a couple forums as well.

[Ford428CJ]

Here is Mr Craines #'s on Barry's heads.

http://www.network54.com/Forum/74182/thread/1354067063/For+those+interested+in+Flow+numbers+for+Barry+R's+new

2.080/1.667 FE flow results  November 28 2012, 7:34 AM


            IN       Ex
.100   68.5    50.37
.200  141.5   103.99
.300  205.69 135.51
.400  261.14 171.7
.450  274.08 184.66
.500  274.25 199.24
.550  285.22 209.61
.600  296.36 213.82
.650  300.82 214.00
.700  307.7 -----
.750  309.73 2" pipe 237.15

[Mike Caruso]

Very nice numbers. Heads with the valves that made those numbers would cost me how much?  Valve weights? Options? Not Shipping or anything. Just trying to get a handle on how much I will need to spend building myself a FE. My garage and basement are empty so you can see where I am coming from I will need everything.

[e philpott]

needless to say but it looks like we (FE'ers) have some good or better options on cylinder heads than  the normal Ebroc/BT heads from before ..... looks like you can't go wrong with BBM or Survival head ..... I know I never wanted to deal with header relocation of the BT heads in my shock tower car and the Pro Ports are just a little out of reach , even on my tippy toes just can't get there , I need a shorter money tree with more money on it

[bn69stang]

Alright fellow  F E  ers  here is what my heads flowed , with a 2.15 in and a 1.68 ex  45 degree seat , rev vaives with bowl blend , sander roll finish .. intake / exhaust
 .100  int   74          exh  55
 .150        110                81
 .200        147               102
 .250        172               119
 .300        200               142
 .350        228               157
 .400        252               175  pipe   182
 .450        271               188            195
 .500        286               198           208
 .550        296               209           218
 .600        298               216           225
 .650        300               216           228
 .700        303               214           228
 .750        308               214           225
 .800        310