Saw these aluminum BB heads on ebay made by Speedmaster for $1100 a pair, anyone use these, any issues

You might Google it

Yes, they are called "Sidewinders" same casting sold by Todd at Moparts Racing, Hughes, CPPA and ProMaxx.

for the price i would get the promaxx heads from jegs.
i've read that they have a very nice facility in Alabama that does the finish work.

NO NO NO!!!!!!!!!!!!!!does not equal Promaxx or Sidewinder!!!

The Speedmaster heads are the ProComp heads, ProComp changed their branding about two years ago. It's no secret, ProComp announced it back then.

The Sidewinder and I believe Promaxx and probably some other names, are better heads from a different Chinese facility. The owner has actually been on this board to explain that.

But the way the marketplace works is that you get online and you can order up a pallet or container or sometimes as few as one pair of quite a few different heads from China, they're not hard to find. When they get here you can call them whatever you can program a CNC machine to spell. Or possibly buy enough and get a custom label cast into the heads.

I believe you can even buy replacement Cummins 6BT blocks.

Anyway, just be aware that ProComp is now called Speedmaster. Most of the part numbers are even the same starting with a PC.

R.

Hughes is selling them as Speedmasters, they sure do look the same as the Sidewinders..

http://www.hughesengines.com/Index/produ...mp;partid=30290

Look at the outside edge on the deck surface below the outer row of head bolts, there are two notches on the corner on the sidewinder and not on the procomp. That is the easy quick way to see if you are getting the good one or the junk

https://www.semashow.com/press/2014/09/1...ew-business-mot

R.

I'll take your word for it as I haven't seen either up close, but gosh there sure do look the same. Could you point out this notch, because i'm not seeing it.

Sidewinders





Speedmasters







Also it has been established the PROMAXX Head is the same as the Sidewinder head, never was the Speedmaster or Procomp brought up

So it looks like speedmaster uses either of the cheap castings. Those are the same as the sidewinder, this is the other cheap casting

http://www.ebay.com/itm/Mopar-Chrysler-BB-383-440-265cc-74cc-As-Cast-Bare-Aluminum-Cylinder-Head-/181870711810?hash=item2a5856d402:g:vmQAAOSwT6pV1ShD&vxp=mtr

Even easier way to tell em apart is the heart shaped chamber in the pro-comp or as it is labeled in this pic a "speedmaster".

Not the same Speedmaster's I'm talking about.

Also, the Ebay sellers name isn't "Speedmaster" but the location is Rialto California, where Speedmaster HQ is.

http://www.ebay.com/itm/Mopar-Chrysler-B...d-/351582057596

Mopar Chrysler BB 361 440 210cc 70cc Performance Aluminum Wedge Cylinder Head

Brand: Speedmaster
Part Number: JM-MP-210-70
Part Type: Cylinder Heads

Cylinder Head Style: Bare
Cylinder Head Material: Aluminum
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 75cc
CNC-Machined Combustion Chamber: No
Intake Runner Volume (cc): 210 cc
Exhaust Runner Volume (cc): 70cc
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Intake Port Shape: Rectangular
Intake Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Location: Standard
Intake Valves Included: No
Intake Valve Diameter (in): 2.100 in.
Exhaust Valves Included: No
Exhaust Valve Diameter (in): 1.810 in.
Valve Springs Included: No
Damper Spring Included: No
Retainers Included: No
Locks Included: No
Valve Stem Seals Included: No
Rocker Arm Studs Included: No
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: No
Valve Cover Mounting Style: Perimeter Bolt
Accessory Bolt Holes Drilled: Yes
Intake Valve Angle: 15 Degree
Exhaust Valve Angle: 15 Degree
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seats Machined: Yes
Valve Seat Machine Style: 3-angle
Valve Seat Material: Hardened
Steam Holes Drilled: No
Quantity: Sold individually.