[GoatZillaRacing]

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

[GoatZillaRacing]

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[GoatZillaRacing]

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[johnta1]

Any head flow specs?


Thanks for the pics/info.

[GoatZillaRacing]

Originally Posted by johnta1

Any head flow specs?


Thanks for the pics/info.

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

[Lee]

Interesting!

[JLMounce]

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

[steve25]

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!

[gtofreek]

Originally Posted by steve25

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.

[grivera]

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?

[72projectbird]

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

[Two_70_Converts]

Flow chart from Hi-Performanc Injuns face book page

[Stan Weiss]

Originally Posted by Two_70_Converts

Flow chart from Hi-Performanc Injuns face book page

Nice Numbers.

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

Stan

[GoatZillaRacing]

Originally Posted by Stan Weiss

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

[GoatZillaRacing]

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

[ponjohn]

Originally Posted by GoatZillaRacing

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

What bore size was used for the flow data?

[grivera]

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

[GoatZillaRacing]

Originally Posted by ponjohn

What bore size was used for the flow data?

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

[GoatZillaRacing]

Originally Posted by grivera

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

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.