First Look @@ High Performance Injuns SpeedMaster Heads
 

First Look at the SpeedMaster Pontiac Heads. I’m impressed with the casting quality, heli-coils where they need to be, machine work looks good. Oil return looks well thought out. High Performance Injuns is offering these for the introductory price of only $1759 a pair picked up at the shop or customer pays actual shipping.

Cylinder Head Material: Aluminum
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 72 cc
CNC-Machined Combustion Chamber: Yes
Intake Runner Volume (cc): 215 cc
Exhaust Runner Volume (cc): 175 cc
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Intake Port Shape: Ram Air IV
Intake Port Location: Standard
Exhaust Port Shape: Ram Air IV
Exhaust Port Location: Standard
Spark Plug Style: Angled
Comp. Valve Job: Yes
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.110 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.660 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.580 in.
Outside Diameter of Outer Spring (in): 1.450 in.
Damper Spring Included: Yes
Number of Springs Per Valve: Dual
Retainers Included: Yes
Retainer Material: Chromoly steel
Locks Included: Yes
Lock Style: 10 degree
Valve Stem Seals Included: Yes
Valve Stem Seal Style: Positive stop
Rocker Arm Studs Included: No
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: No
Valve Cover Mounting Style: Center & Perimeter Bolt
Accessory Bolt Holes Drilled: Yes
Intake Valve Angle: 14 deg.
Exhaust Valve Angle: 14 deg.
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seats Machined: Yes
Valve Seat Machine Style: 3-angle
Valve Seat Material: Ductile iron
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Quantity: Sold as a pair.

Assembly Specifications

Max Lift: .580"
Coil Bind: .740"
Intake Install: 135lbs @ 1.8
Exhaust Install: 135lbs @ 1.8
Closed Sear Pressure: 125lbs
Open Seat Pressure: 320lbs

First 5 Pics

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Any head flow specs?


Thanks for the pics/info.


:)

Working on the flow numbers now. Many more pics to come.

Interesting!

Dare I say it, the casting quality looks (at least on the surface) to be as good, if not better than my KRE's.

The heck with flow numbers, lets see how well the seats are installed as lately this has been a mess on a lot of heads, to the tune of being able to get a .020" feeler gauge in between the seat and the bottom of its Bore!

Such is a snapped off valve in the waiting once enough run time gets on the heads and the seat gets yanked all the way in!

Don't get me wrong I don't mean that's the quality level of these heads , I just want to see how 50 or so pairs of them turn out!

I have seen where the seats do not get set all the way down against the head. This can happen for a few reasons.



1. While installing seats, seat lubricant can get under the seat and prevent it from seating. I get the seat started and blow the lube out from under the seat before I drive it the rest of the way in.



2. More importantly, driving the seats in with a hammer other than a dead blow hammer will cause the seat to bounce up a few thousandths when it hits the bottom of the seat pocket. We tested this extensively. I put seats in aluminum heads with a minimum of .008" press-fit[.002" more than industry standard]. When I tested driving the seats in with a standard steel hammer, I could not get the seat to sit flush no matter how hard I hit it. Then using a dead blow hammer, 1 wack and seats were seated. From now on, I only use a dead blow hammer to seat the seats.


3. If the chamfer on the seat insert is not radiused[I use a Scotchbrite wheel to radius and smooth the chamfer] it can scrape aluminum off the side of the seat pocket and roll it down under the seat. In this case, you will never get it seated. This scenario usually ends up with a large gap like the .020" you mention. The seat bouncing up off the bottom of the seat pocket usually ends up with only about .003"-.005" gap.

GoatZilla - thank you for taking the time to share this info.


Paul - Great info. On these mass produced heads, are the seats installed by machine/robot?

Those are pretty interesting! The price is great if they prove to be a worthy competitor to the Edelbrocks and KREs.

Flow chart from Hi-Performanc Injuns face book page

http://forums.maxperformanceinc.com/...ictureid=13379

Nice Numbers.

Since I don't do FaceBook. Does it say if the exhaust is with or without a pipe?

Stan

1/2 inch radius intake plate and short stack exhaust tube

Eddy vs SpeedMaster Comparison
 

Here's a Simple Comparison of Edelbrock 72cc CNC Heads and our SpeedMaster 72cc CNC Heads.
These are as cast numbers using a Superflow SF600 @ 28". Winning Numbers are in RED.
Price Comparison is using Summit's sale price on Edelbrocks and High Performance Injuns sale price on SpeedMasters. Both include shipping.

More Flow for Less Dough. What else can you buy with your $1266 $aving$? Intake? Cam/Lifters? Headers? All of this!

Fully machined heads with seats and guides but no valves, valve springs, retainers, etc are also on sale at $1549 a pair with shipping included.

PayPal Accepted at PayPal.me/RPM.tv or send checks to:

High Performance Injuns
1632 E Northfield Dr #500
Brownsburg, IN 46112

What bore size was used for the flow data?

What brand are the valves, springs, retainers, rocker studs, etc?

4.150. These will flow higher with a larger bore and even more once the CNC porting programs are completed.

Everything on the complete heads comes from SpeedMaster. We will be offering these castings with various aftermarket springs, valves etc.

You can also take advantage of the machined bare castings with seats and guides but no valves, springs etc for only $1549 a pair including shipping.

Larger combustion chambers?

They are only offering the 72cc CNC chamber but as time permits we'll see how much meat is left to enlarge that.

That’s 1200 difference is being made up somewhere

Anybody using them yet to see if any problems

Nobody's bolted them on yet as far as I've heard. I'm really not expecting any problems although there are a few things we will do to Optimize our premium offerings.
Good looking high quality castings right out of the box.

180°?
 

Your father in-law bought Global West control arms, but you bought the Chinese knockoffs for $1000 less on eBay. Dont get me wrong, I still remember Pro Comp. I'm just trying to understand this post as it really is quite contradictory.

Including the nasty intake port entries (machined entry not blended to port walls)?

1200 is a big number for things like springs retainers and valves. I actually looked at the parts side by side. Ascertained on my own volition that there was no way these things were coming from two different places and made my decision! The knockoffs took global west alignment specs. At best these heads are cast in China where as we know where Edelbrock is cast

I did not know Edelbrock was cast in China. When did that start ?
I guess nothing is sacred anymore. F the Chi Coms.
Craftsman tools used to be the cheap US made hand tools. Not they come from China too. I would rather buy from Taiwan, at least they are free.

I said we know where Edelbrock is cast which is USA

Umm, OK? 1000 is a big number for bushings and balljoints. As for the knockoffs taking GW alignment specs, well, I had to look that one up. You actually bought copies of their control arms, and then you contacted Global West for support? You bought your Chinese parts because you could save some coin, so stop being judgemental and let GZR do his thing.

The problems I have with these heads is that the edelbrock bare heads are only $130 more.
The assembled speedmaster heads for 440 mopar and 455 oldsmobile are close to 40% cheaper then the pontiac heads. Why?

Bare Edelbrocks with UNFINISHED Chambers are $1627.90 at Summit. Ours are $1549 with CNC Chambers so it's a little less than you thought, BUT what's it going to cost to get the chambers CNCed?

So no idea where the source the parts? Any way to find out?

Thank you for the visual evaluation of the new heads. Also for the complete list of specs and flow numbers. Several additional items that would be of interest would be: Could you please put one of these heads on a scale and get a bare casting weight of the head. Of course seats and guides would be installed, no problem there. It would be interesting to compare between these, E-heads and KRE. As we all know, sealing an aluminum head to an iron block with 10 head bolts is a challenge. Flimsy, lightweight heads make this an even more difficult task. Great cooling system layout helps, but there is no replacement for actual material in the head. Second, do you plan to cut one head up to inspect water jackets, thickness of the casting around the head bolt columns, meat in the bowl area, around the short turn, around the spark plug if you intend to make the chamber larger? Seems like all this would be necessary to fully evaluate. I realize you just got your hands on them and the initial look seems positive, but it seems like allot more destructive testing as well as dyno testing at a minimum would be needed to draw any real conclusions. I wish you the best in your efforts. Any chance you could 3D print a pair of these heads in IRON? (Which is what we really all need whether people want to admit it or not)

How much advantage is there between cnc and as cast chambers for the average street guy? Bare Oldsmobile speedmaster heads are $760 a pair at jegs. Less than half the price of the speedmaster pontiac heads. The olds chambers don't look to be cnc machined.

SpeedMaster sources parts from US, Australian and Chinese suppliers. I'm sure over time I'll get everything figured out but quality will always be highest on my list.

Like someone else pointed out it needs more evaluation.

We're looking at bolting a set on our 220" Rear Engine Dyno.

I need to correct myself. These $1627.90 Edelbrock heads are semi finished. So the correct BARE Edelbrock 72cc heads are P/N 60589 with AS CAST Chambers and a price at both Summit and Jegs of $1893 a pair. Then you need to have the chambers CNCed but you'll never get the 72cc CNCed Fast Burn Heart Shaped chamber when it's already cast at 72cc with the wrong shape.

Either way, the price difference in BARE heads is $344 plus the chamber work.

Lots more to do but one thing I can report is that the deck thickness looks to be .500 where Edelbrocks are .625. I don't see this as a huge drawback as these are street heads not our Arrow Injuneering Race Heads.
More to come for sure (including cast iron d-ports)

Tremendous undertaking, thank you for bringing what looks like a nice alternative to market.

Thanks! I'm sure just like Edelbrock there will be improvements made as we go but these should help keep more Pontiac's out there running Pontiac "Injuns".

I share the same sentiment as Lou. Thanks for looking at these in depth!

60539 would be the correct comparison for the bare heads. 60589, are the older style chamber that doesn’t need cnc’d but just polished. But they actually cost more now than the Cnc heart shape chamber. The cnc e’s are 60539 at 72 cc. Which are 870.50 through summit.

Isn't it great to have so many choices now! The Pontiac hobby is alive and well! Thanks for the info.

I wasn’t trying to poop on anyone’s efforts I just feel like with such an important part it needs a lot of scrutiny before everyone just starts clapping their hands and jumping up and down. I will have almost 10 grand in my engine and I would hate to lose it over 300 bucks

$300??

I was typing and reading at the same time I meant 1200

Over the years how many sets of 670's, 16's 48's etc., have been butchered up, blown up, cracked from overheating or freezing, piston kissed, valve sank, well you get the idea!

They ain't making these ever again! If you have a nice set, you might consider putting them away and running these modern replacements.

It's time to start saving those original heads for restoration projects.

My dragster has 62's on it that are pretty close to maxed out for d-ports at around 260 CFM. These out of the box as cast street heads flow 289/202 CFM at .600 lift and weigh a bunch less (I'll be weighing them later today).

Let's help keep the past alive as we move into the future.