[PAUL K]

Originally Posted by Baron Von Zeppelin

CNC =
Intake port 2.350-2.380
and 1.185 wide.

Can anyone measure and post what the as-cast versions measure ?

In retrospect - who was it that guesstimated 320cfm zone on CNC ?
Was it Randy R. ?
Don't know who else would have been in position to give an estimation previously.

** Error on my part using 280cfm as-cast earlier , its 289 (290)

The as cast version is CNC matched the RAIV size 2.20× 1.12 maybe?? ...... For sure RAIV size though

[Steve C.]

Here is what Butler states on the Hurricane version they sell...

"Adequate material for RA IV port match. (may not have enough material to seal on a ported Edelbrock head)"

https://butlerperformance.com/i-2445...tegory:1234847

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[Skip Fix]

Remember guys these are geared towards budget performance not full out race stuff! The CNC is a budget CNC to get them just a step up. I was a little surprised the port height on these as my CNC KRE and SD E heads are that tall.

Stan in your comments almost all heads with adjacent intake ports sharing a common wall the intake valve is offset not dead in the middle of the port entrance-you ought to see my 409 heads!. Assume the CNC program was just a good bowl cutter centered on the guide. The common wall going straight back will not be touched by a bowl cutter as the bowl is offset.

Here is a 409 port that shows the offset, Pontiac is similar just not as pronounced.

[Skip Fix]

Looks like those numbers on the valves come back as PCE SS valves.



Founded in Sydney Australia with one CNC Machine increasing to sixty 5-Axis CNC machines before being acquired in 2013. The Company’s main focus has always been "Speed to Market", launching 1,200+ new products each year. Needing just one month to develop a new product and get it on to the shelf, compared to the six-month industry average. PCE has a policy of zero advertising, preferring to invest a percentage of revenues in new product development. These products being white-labeled to most of the biggest brands in the business.

[Baron Von Zeppelin]

Originally Posted by Skip Fix

Remember guys these are geared towards budget performance not full out race stuff! The CNC is a budget CNC to get them just a step up.

I was a little surprised the port height on these as my CNC KRE and SD E heads are that tall.

Absolutely , that was about all I was expecting.
And its definitely a value for $300
A guy could do his own touching up from this point and make them as sweet as he wants them to be, or look .

But the second part is discouraging if basic intakes won't seal.
Seems like a step in the wrong direction from original intentions.

It's only Day 1
That might turn out not to be so troublesome.

[Skip Fix]

It is not that big a deal to add welds and remill the surface. heck most intakes I have had need milling anyway.

[Stan Weiss]

Originally Posted by Skip Fix

Remember guys these are geared towards budget performance not full out race stuff! The CNC is a budget CNC to get them just a step up. I was a little surprised the port height on these as my CNC KRE and SD E heads are that tall.

Stan in your comments almost all heads with adjacent intake ports sharing a common wall the intake valve is offset not dead in the middle of the port entrance-you ought to see my 409 heads!. Assume the CNC program was just a good bowl cutter centered on the guide. The common wall going straight back will not be touched by a bowl cutter as the bowl is offset.

Here is a 409 port that shows the offset, Pontiac is similar just not as pronounced.

Skip,
That is possible but why is there be an area in the middle of it that does get cut?

Stan

[Steve C.]

As always Skip's observations are spot on. Both SD Performance and KRE use tall ports for their higher flowing Edelbrock heads ( not a negative situation).

Example, on the welded Torker II intake manifold linked in my previous post #151, the heads were SD Performance 345 cfm CNC ported cylinder heads. It was noted the intake manifold ports were too short for the ports on the heads, thus the need to weld them..


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[Baron Von Zeppelin]

Wellllllllllllll .....
unless you're a goofy type that wants to run cast iron 3x2 & 4bbl factory intakes. (< me )
Or even a factory Ram4 / HO alumi intake probably won't do either... for those guys.

It just means my type needs to stay with the as-cast heads.

These CNC's are going to be way over most of our Street Car needs anyway.
They could be 650+ HP heads in capability as far as their cores , right outta da box.
Any of you guys that are building for that kind of power level and bought these on sale , should be getting pretty giggly about it.

[Gach]

I’m surprised they are that tall. I was hoping for an out-of-the-box bolt on deal and no intake modifying. Price wise still a good deal.

[Gach]

Anyway good information at least one knows what they are up against if one chooses to go that route, knowing intake modification possible welding to fit will be needed. The only thing that troubles me is the pressed in freeze plugs.

[ID67goat]

Originally Posted by Baron Von Zeppelin

CNC =
Intake port 2.350-2.380
and 1.185 wide.

Can anyone measure and post what the as-cast versions measure ?

In retrospect - who was it that guesstimated 320cfm zone on CNC ?
Was it Randy R. ?
Don't know who else would have been in position to give an estimation previously.

** Error on my part using 280cfm as-cast earlier , its 289 (290)

30 +/- extra cfm seems like more than just trueing up and flattening out the wobbles and ridges
… and it makes sense too , from a marketing point that will be based against a number (eventually).
This will be fun to follow.

From heads and intakes that I have:

“As cast” the port entrance has a cnc finish about 0.200 deep at the top and bottom of the ports and then about 0.300 on the sides. This opening is roughly 2.220 tall by 1.200 wide and quickly narrows down to about 1.000 by the pushrod bulge while the port height narrowed down to about 2.090 on my non-CNC heads.

The Speedmaster dual plane intake ports are about 1.150 wide by 2.150 tall. The single plane intake measured at around 1.100 by 2.080 tall. The port alignment is pretty poor on the intakes and all the inner runners (3, 5, 4, and 6) are offset about 0.060 lower than the outer ports.

Hope this helps…

[Nobuddy]

The Speedmaster set I have from two years ago measured at 2.20" x 1.275" at the gasket surface and the openings are CNC cut as mentioned earlier.

Much like Edelbrocks, the RAIV (1233) type gaskets to not fit exactly as the ports are higher. Ports are close enough size but higher. I believe more like the SD-455 so you have to alter the bolt holes in the gasket to get the ports lined up.

[GoatZillaRacing]

Yes I estimated that the Speedmaster CNC heads will flow 320CFM. I have a set waiting to be flowed right now so we'll see how close my guestimation is!

[Skip Fix]

Originally Posted by Stan Weiss

Skip,
That is possible but why is there be an area in the middle of it that does get cut?

Stan

Stan, I my guess a "mini throat cut". There sure could be core shift. I've only pulled one set of valves out. I'll stick a straight edge from the throat and see if it is straight

My mach8ineshop got an aluminum welds not sure if MIG or TIG as they see so many manifold or head defects so not a big deal on the intake if aluminum.

The "original" Holley Dominator Intake has more material than the Tomahawk and can seal. I think the Tomahawk adding EFI bosses dropped down the top of the casting. Steve's SD modified Holley sealed fine on my heads on the 455 in the 78 TA I have a welded T2 on.

[RUDOLFSSON]

Originally Posted by Stan Weiss

It would have been nice if the heads had been flowed by someone else and Rocky had not just used the manufactures flow numbers.

I found this video interesting
https://www.youtube.com/watch?v=S7bRyjOUh6s

Stan

FYI:
This guy has a new video out on these heads...

[Stan Weiss]

Originally Posted by RUDOLFSSON

FYI:
This guy has a new video out on these heads...

Thanks, some interesting thing talked about.

For anyone else that wants to see it here is the link https://www.youtube.com/watch?v=GEpj3S0w6xU

Stan

[Nobuddy]

Originally Posted by RUDOLFSSON

FYI:
This guy has a new video out on these heads...

He sure seems hung up on the raised ports that do not line up with a Felpro 1233. So probably safe to assume he has never seen a set of Edelbrocks. Wanting to raise all the gasket port openings rather than lower the bolt holes is bizarre but I guess everyone has their own way of thinking.

[PAUL K]

Originally Posted by Nobuddy

He sure seems hung up on the raised ports that do not line up with a Felpro 1233. So probably safe to assume he has never seen a set of Edelbrocks. Wanting to raise all the gasket port openings rather than lower the bolt holes is bizarre but I guess everyone has their own way of thinking.

I didn't watch the video. If I understand correct, it's saying when the bolt holes in the head are lined up with the gaskets, the ports in the head are raised taller than the port openings in the gasket?

[Steve C.]

Edelbrock PONTIAC CYLINDER HEAD INTAKE MANIFOLD - GASKET FITTING:

Note the use of the Fel-Pro 1233 gasket

The position of the intake port entry on all Edelbrock Pontiac cylinder heads has the same roof height as a Pontiac 455 Super Duty cylinder
head. This was done to provide the best performing intake port while maintaining a stock Pontiac port location. The Fel-Pro 1233 intake manifold
gasket has a port roof to intake manifold bolt hole centerline dimension that is .06” lower than 455 Super Duty head dimension. When installing the
Fel-Pro 1233 intake gasket on Edelbrock Pontiac cylinder heads, align the gasket with the intake port entries. Three of the bolt holes in the gasket will
have to be elongated as shown in the illustration.

Illustration can be seen here by typing in the part number:

https://www.edelbrock.com/edelbrock-...esource-center

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