[slowbird]

I have been looking for cnc heads to put my dad's GTO back on the street. And decided to go with Paul Knippens cnc version. Very nice looking and have proven performance. Hoping for well over 700hp on 92 octane. With the parts we have plus these new heads.

[AG]

Why not use the heart shaped Eddy chamber versions?

[slowbird]

Originally Posted by AG

Why not use the heart shaped Eddy chamber versions?

Availability is 1 reason

[i82much]

what intake ya gonna use, and did you have work done to the intake as well?

also curious on cam and valve spring choice here.

[slowbird]

Originally Posted by i82much

what intake ya gonna use, and did you have work done to the intake as well?

also curious on cam and valve spring choice here.

I bought a used ported Victor that made good power before

[i82much]

Originally Posted by slowbird

I bought a used ported Victor that made good power before

cool thanks!

[Steve C.]

Paul was involved with development work on Butlers CNC programs.

Another 'magic man'

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[nas t eh]

Those flow really well at .400 lift and above. What is the delivery time supposed to be? I’m guessing they were not cheap.

[slowbird]

Originally Posted by nas t eh

Those flow really well at .400 lift and above. What is the delivery time supposed to be? I’m guessing they were not cheap.

Since it is currently Sunday we haven't worked out all the details but I believe it's on par with other shops, just a matter of getting castings

[Steve C.]

I would be interested in the intake port dimensions at the entrance, width and height.
Also the intake runner volume.

Thanks.

[Dragncar]

Cool, can you tell us more about the build ?

[slowbird]

Originally Posted by Dragncar

Cool, can you tell us more about the build ?

Plan is to pull the high compression topend off of our GTO and put Jake's intake, carb and cam in with these heads and let my dad enjoy it on the street while he can. So it'll be like Jake's 434 but in a 505

[Dragncar]

Originally Posted by slowbird

Plan is to pull the high compression topend off of our GTO and put Jake's intake, carb and cam in with these heads and let my dad enjoy it on the street while he can. So it'll be like Jake's 434 but in a 505

Nice, so that is why you know so much about that cam. I forgot you were the one who bought it.

[ponjohn]

Do these start as 72cc?

[PAUL K]

These are great heads for a serious effort high performance Pontiac. They are copies of what we consider our "standard pushrod location race head". They differ from other commercially available CNC heads in many ways. But what we are most proud of (other than their power producing potential) is the lack of pushrod tubes and head bolt sleeves. For years I've rolled my eyes looking at ported heads that slice away the head bolt boss. The loss of integrity of the casting and potential for sucking oil far out weighs any power gain found from removing the head bolt boss. The pushrod tubes are almost always in the way of the pushrod or a shop installs a tube that is excessively large and reduces the CSA area at a critical point. These heads have made over 800 horsepower on stock block builds and have run 5.0 in the 1/8 on a 3300 lbs. street driven nitrous car.

The port volume is close to 250 cc.

Port window has been optimized to work with a Victor manifold.

That's a modified cast 72 CC chamber in the picture. We have done these heads with the Edelbrock CNC chamber and 87 CC ports. Valve size can be varied per application.

Delivery times are a mess due to parts availability, folks not wanting to work and the people that are willing to work being over loaded.

[Steve C.]

Stated- " But what we are most proud of (other than their power producing potential) is the lack of pushrod tubes ...."

Interesting subject, removing material from the pushrod bulge and brought up within this thread:

https://forums.maxperformanceinc.com...ght=cattle+car

A factor or not, I'm not sure. But I've always enjoyed Jim McFarland's comment regarding mixture homogeneity possibly involving a protruding pushrod sleeve.....

A train comprised of loaded cattle cars is moving down its tracks at a constant speed. In this example, the train is analogous to air and the cattle to fuel. At this point, the combination is well "mixed". Now, visualize what happens if the train suddenly changes in speed, direction or accelerates or decelerates. It doesn't require much imagination to realize how the quality of this "mixture" will be effected, accordingly. Such is the case between air and fuel in an inlet path, during changes in air direction or speed.


.


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[i82much]

Originally Posted by PAUL K

These are great heads for a serious effort high performance Pontiac. They are copies of what we consider our "standard pushrod location race head". They differ from other commercially available CNC heads in many ways. But what we are most proud of (other than their power producing potential) is the lack of pushrod tubes and head bolt sleeves. For years I've rolled my eyes looking at ported heads that slice away the head bolt boss. The loss of integrity of the casting and potential for sucking oil far out weighs any power gain found from removing the head bolt boss. The pushrod tubes are almost always in the way of the pushrod or a shop installs a tube that is excessively large and reduces the CSA area at a critical point. These heads have made over 800 horsepower on stock block builds and have run 5.0 in the 1/8 on a 3300 lbs. street driven nitrous car.

The port volume is close to 250 cc.

Port window has been optimized to work with a Victor manifold.

That's a modified cast 72 CC chamber in the picture. We have done these heads with the Edelbrock CNC chamber and 87 CC ports. Valve size can be varied per application.

Delivery times are a mess due to parts availability, folks not wanting to work and the people that are willing to work being over loaded.

do you have a different program for someone that wants to run a T2, RPM, or Northwind?

[slowbird]

Originally Posted by i82much

do you have a different program for someone that wants to run a T2, RPM, or Northwind?

I think only intake you listed that might have an issue is the T2 and just because of lack of material in the roof on those intakes.

[Gach]

Originally Posted by PAUL K

These are great heads for a serious effort high performance Pontiac. They are copies of what we consider our "standard pushrod location race head". They differ from other commercially available CNC heads in many ways. But what we are most proud of (other than their power producing potential) is the lack of pushrod tubes and head bolt sleeves. For years I've rolled my eyes looking at ported heads that slice away the head bolt boss. The loss of integrity of the casting and potential for sucking oil far out weighs any power gain found from removing the head bolt boss. The pushrod tubes are almost always in the way of the pushrod or a shop installs a tube that is excessively large and reduces the CSA area at a critical point. These heads have made over 800 horsepower on stock block builds and have run 5.0 in the 1/8 on a 3300 lbs. street driven nitrous car.

The port volume is close to 250 cc.

Port window has been optimized to work with a Victor manifold.

That's a modified cast 72 CC chamber in the picture. We have done these heads with the Edelbrock CNC chamber and 87 CC ports. Valve size can be varied per application.

Delivery times are a mess due to parts availability, folks not wanting to work and the people that are willing to work being over loaded.

If you don’t mind me asking whats a set go for, that’!! make 700 hp with a Victor intake on a 505. Set up for right cam springs.

[Gach]

Got a friend I’m doing a 505 for and he’s about ready to pull the tiger. Oh 72 cc chamber Text me if you prefer.