[65nss4spdGTO]

We just completed port development on the "Race Ready" package standard port Tiger head. For discussion purposes and the variations in flow bench data, the following information is the actual increase in CFM from the baseline head. The port CSA is about 2% larger, the goal was to improve mid lift airflow.

Intake lift / CFM Gain
.100 +5
.200 +12
.300 +11
.400 +11
.500 +21
.600 +21
.700 +26
.750 +33
.800 +19
.900 +15

Exhaust lift / CFM
.100 +22
.200 +20
.300 +22
.400 +28
.500 +29
.600 +18
.700 +19
.800 +21
.900 +22

The package uses the standard 2.250" intake valve, 1.800" exhaust valve in the standard valve location. Port velocity is increased to achieve strong low to mid lift numbers while keeping the port size to a minimum. I've attached port mold pictures below, the new port is the one on the right.

The cost for this upgrade is $1,485.00.

Calvin Hill
Hill Performance / Mondello Tech Center
708-250-7420 / 931-459-2760

[slowbird]

How much did you raise the floor? Looks like its raised a decent amount

[67 ProTouring Catalina]

those looklike good improvement, do you have a cnc program for any iron heads ?

[bankbook]

It is nice to see actual numbers as well as port shapes.

Looks like you and your crew have settled in nicely at Mondello. I can only wait to see what other developments come out of your shop in regards to the Pontiac market.

[BruceWilkie]

I paid a visit yesterday. All I can say is if you are a Pontiac enthusiast or any brand for that matter this shop has a lot to offer! There will be some nice stuff showing up in the future. A bunch of things already developed to meet and exceed anyones needs. It appears new products may also show up that will benefit us as well.

A big thumbs up to Calvin and his staff.

[potentpontiac]

Any one working on an Intake for the Pro Port Heads??? I think Wade at BOP had mentioned something maybe coming in the new year. We will definately need some development on Intake choices for all the new port designs that are coming out. Nice port moulds on the Tiger head.

[Jim Robertson]

Calvin,
Nice shaping...those should work out great. If you raised the floor did you weld it up or? What is the cross section area at the pushrod on your port? What is the actual flow volume (cfm) at .700 lift on your intake port?
Thanks

[65nss4spdGTO]

Originally Posted by Jim Robertson

Calvin,
Nice shaping...those should work out great. If you raised the floor did you weld it up or? What is the cross section area at the pushrod on your port? What is the actual flow volume (cfm) at .700 lift on your intake port?
Thanks

Jim,

We raised the floor about .125 with epoxy, moved the port over about the same. I don't have the CSA data with me, peak air flow was just under 450CFM on a 4.375" bore.

If you look at the short turn, you can see how smooth the transition is as compared to the as cast port.

Thanks.

Calvin Hill
Hill Performance / Mondello Tech Center
708-250-7420

[cgeise]

Calvin - -Did you find the numbers that you got prior to your work - -your baseline -- similar to the advertised numbers for these heads ??

[60man]

Very nice work Calvin..
IIR the CFM on my Tigers I got from AllPontiac/Cerelli with same valve size/location flowed like 412 @ .750..so +33 is right there..Glad to hear velocity mentioned...
If I ever go to a 535 CI I might be in the market..

Would love to visit your new shop sometime..
See ya at Norwalk

[Milepost]

Very nice work Calvin! Will these heads require more offset on the intake rockers since you widened the port? Any idea how much $$$$ to modify the Tiger intake manifold to match?

[65nss4spdGTO]

Originally Posted by cgeise

Calvin - -Did you find the numbers that you got prior to your work - -your baseline -- similar to the advertised numbers for these heads ??

These heads came with flow data, the numbers were close to what we evaluated on our bench, also inline with what Troy said, within 2%.

Calvin Hill
Hill Performance / Mondello Tech Center
708-250-7420

[Milepost]

I've always liked the Tiger heads and felt that they are the ultimate all out classic inline race head but even though I've entertained the thought of putting a set on a serious street car I also realized it wouldn't make any sense unless you run .800 inches of lift or more to maximize the heads potential. ( which kinda throws the street part out the window.....) Thanks to Calvin Hill and Bill Anderson's port modifications we now have a "streetable" Tiger that flows over 440 CFM at around .750''-800" with strong mid flow numbers to boot. I've been told by a reliable source that the CSA went from 3.55" to only 3.61"!! So here is my dilemma....... do I buy a pair to put on a 535 inch Pro Tour/ Texas Mile 72 Firebird and then use my ported CV-1 heads on a future drag build or should I hold out and see how the new Edelbrock Pro ports turn out.

[slowbird]

440cfm @ .750 is moving some air. Wish my heads did that.

[p4msi1]

Milepost, that's the exact engine in my stock looking 69 firebird street car. 535, ported tiger heads, and custom intake manifold low enough to close the super 400 hood. yes, it has .800 lift with 264-270 duration on the comp cam. 11.1 comp. I just took it for its first ride, and untuned, it feels as fast as my procharged 80 formula. The 80 formula puts down over 600 HP and torque to the ground, so I'm using it as a gauge. Will hit the chassis dyno in a month or two to tune it.

Thanks to Dave Wilcox for the beautiful port work and CVMS for assembly.

Steve

[p4msi1]

65 NSS, thanks for the time and effort you guys put into these projects. We ( Pontiac people)now have no excuse not to kick Bowtie Butt, at least on the street classes and lower level racing. Now the rest of us have to get off the computer and start stroking checks to all you guys and buy the real good stuff and keep you in business.

Steve

[Milepost]

Originally Posted by p4msi1

Milepost, that's the exact engine in my stock looking 69 firebird street car. 535, ported tiger heads, and custom intake manifold low enough to close the super 400 hood. yes, it has .800 lift with 264-270 duration on the comp cam. 11.1 comp. I just took it for its first ride, and untuned, it feels as fast as my procharged 80 formula. The 80 formula puts down over 600 HP and torque to the ground, so I'm using it as a gauge. Will hit the chassis dyno in a month or two to tune it.

Thanks to Dave Wilcox for the beautiful port work and CVMS for assembly.

Steve

IMO There is a lot going for the Tiger heads over the Edelbrock Pro-ports. They are a proven power maker. They are AVAILABLE right now! The head is rolled over to 12 degrees which keeps them legal for sanctioned racing classes that require no more than a 2 degree change in valve angle. The 11 degree Proport won't fit within those rules. There are 460 + CFM programs already developed for the Tigers and Allpontiac has a great intake manifold developed for them. No way the old Victor manifold will be able to match the the capabilities of a 460 CFM head. Sheetmetal manifolds.... $$$$$..... aren't legal in many classes and if they are you get hit with a weight penalty if you do run one. I can't see how the 11 degree Proport head with its shorter valves can come close to outflowing the Tigers. The 12.6 degree head won't even come close.... It may sound like I'm slamming the E heads, but I'm not. I'm sure the casting quality will be great and I really like how Edelbrock have addressed the cooling and oil drain back issues. I just can't see how they can compete with the likes of the Kauffman High ports or the Tiger heads at a competitive price. Many thanks to Calvin and his crew at Mondello Performance for giving us a what may be the ultimate hardcore Pontiac "Classic style" street head.

[Milepost]

Originally Posted by p4msi1

Milepost, that's the exact engine in my stock looking 69 firebird street car. 535, ported tiger heads, and custom intake manifold low enough to close the super 400 hood. yes, it has .800 lift with 264-270 duration on the comp cam. 11.1 comp. I just took it for its first ride, and untuned, it feels as fast as my procharged 80 formula. The 80 formula puts down over 600 HP and torque to the ground, so I'm using it as a gauge. Will hit the chassis dyno in a month or two to tune it.

Thanks to Dave Wilcox for the beautiful port work and CVMS for assembly.

Steve

Awesome build Steve! I'm curious how you addressed the manifold height/ hood clearance issues. BTW How do you like the super 400 hood? Any chance we can get you to post some pics of your beast?

[60man]

Correction...my .750 lift CFM is only approx. 392 not 412.....My memory sux..Sorry ...found flow sheet. My heads are also a set of "early" heads. They were flowed in '07....Not sure what a set of newer Tiger's flow...
Don't want to mislead anyone...
Keep up the good work...

[65nss4spdGTO]

Originally Posted by 60man

Correction...my .750 lift CFM is only approx. 392 not 412.....My memory sux..Sorry ...found flow sheet. My heads are also a set of "early" heads. They were flowed in '07....Not sure what a set of newer Tiger's flow...
Don't want to mislead anyone...
Keep up the good work...

When I compared our numbers to what was provided, ours were a bit lower (2%).

Troy,

Hope all is well, glad to know the year turned out well for you, see you at Norwak and lets hope we can line up our barges and have some fun!

Calvin