[David Holmberg]

JC, Jack said it was an option.

[J.C.you]

Originally Posted by David Holmberg

JC, Jack said it was an option.

ok, how did I miss that?

[Daniel Barton]

Originally Posted by johnta1

WOW!!!!
Guess not.

Pro Stock Truck hasn't ran for over 10 years.
I didn't follow it anyway, have no clue what their specs were.

Just using 2300 weight and 7.43 ET, around 1100 HP.

That was good of you to put your figure up to show just how inaccurate you are on these sort of things! You honestly believe that a overhead valve traditional American V8 with pushrods makes over 3 horsepower per inch??? I appreciate you showing that you know absolutely nothing about these type of engines and their applications. By the way... you should NEVER figure horsepower off of ET. Just wow!

[Dragncar]

OK fellas, What do you think these heads would do in very high effort power plants like Rodney Butlers, the Dirty birds or John Welters.
Boosted to the max. Maybe the added head bolts for extra durability ?
How much HP does it take to be "all in" in Pro Mod ? 3500- 4000 ?
And could the current blocks take it. I know the MR1s experience cap walk at very high HP levels. And if they do the AP blocks certainly do since they are basically the same block.
These heads on a new Pontiac block with priority main oiling, larger and higher cam tunnel, somewhat shorter deck and a LS1 style cross bolted mains. Just might be the ticket.
Hey, at this point I would still call it a Pontiac, why not. There is room for both. The iron heads and RAIV cam guys and this.
Visner said he had a non canted valve Pontiac head on one post. The head I would like to see is a Pontiac head that takes a standard Pontiac valve cover, inline valves and RAV exhaust location. Just put the intake ports/ runners where they need to be to make the most power with the room you have without any pushrods going through the middle of them. At least it would "look" like a Pontiac.

[David Holmberg]

Originally Posted by J.C.you

ok, how did I miss that?

7000 posts to look through, I don't know it was right there.

[LiL Jack]

Originally Posted by J.C.you

nice pic....was there any thought process including a provision for extra headbolts?

There can be four extra head bolts at the 12 and 6 o'clock position above and below the cylinder on 4,6,3 and 5. If I remeber correctly.

Visner thought it up.

[Travis Q]

I think that these heads would rock and roll in a blower combination. They would also help a turbo combo, as well...but not as much as a blown combo.

We've had a grand total of zero head gasket issues since we went to the added head bolts on the E head. The billets might not even need the extra studs, especially if you had room around the stud to go to a 9/16" stud like Eric and Mike did with their Fives. That would sure be an added bonus...less crap to deal with is always a good thing.

[Elarson]

10 head studs is plenty if you have a stiff enough head to bridge between them....and spread the combustion loads to more than just the 4 closest studs. Boss Bird has zero head gasket leakage and we're still on our first set of copper Flatout gaskets..

Eric

[Elarson]

The Visner billet heads look pretty stiff and I think they'll probably seal great.

Eric

[ponjohn]

Originally Posted by Travis Q

I think that these heads would rock and roll in a blower combination. They would also help a turbo combo, as well...but not as much as a blown combo.

Why not on both?

[twinturrbo406]

[QUOTE=Daniel Barton;5091717] You honestly believe that a overhead valve traditional American V8 with pushrods makes over 3 horsepower per inch??? /QUOTE]



http://youtu.be/HihdoLYhWy8

... this one makes right on 2.9 per cube ...

[cptinjak]

[QUOTE=twinturrbo406;5092090]

Originally Posted by Daniel Barton

You honestly believe that a overhead valve traditional American V8 with pushrods makes over 3 horsepower per inch??? /QUOTE]



http://youtu.be/HihdoLYhWy8

... this one makes right on 2.9 per cube ...

2.875 to be exact

Yes we make 1140-1150 with our ANDRA pro stock stuff. Those are some sweet little smallblocks.

Jack

[Travis Q]

Originally Posted by ponjohn

Why not on both?

Would definitely pick both combinations up, no doubt.

Blown engines rely a great deal on the ability of the cylinder head and camshaft to move air through the engine; the compressor is tied to the front of the crankshaft. With a turbocharged combination, the air compressor is not tied to engine speed, so there is a little bit more latitude with what we can get away with.

You will see a lot of folks that say "bolt a bigger head on, and you'll make more power with less boost". Most times, that is a fact with a blown combination. And most (not all, but most) times, that statement is total fiction with a turbocharged engine. They are two totally different animals that are typically run in different ways on the racetrack.

[johnta1]

cptinjak, thanks for the info on your head.

How long did it take to make Jack's head?

He said 3 1/2 months, but that seems long for a CNC'd head.
Also, the head still needs port work when you're done maching it?

It looks like a great head and will make some serious power.

[Daniel Barton]

[QUOTE=twinturrbo406;5092090]

Originally Posted by Daniel Barton

You honestly believe that a overhead valve traditional American V8 with pushrods makes over 3 horsepower per inch??? /QUOTE]



http://youtu.be/HihdoLYhWy8

... this one makes right on 2.9 per cube ...

2.875 per inch is bad ass, but it is not 3.0 per inch which on a 400 is a difference of 50 very expensive and time consuming horsepower to find on an engine like that! The 3.07 number per inch that was thrown out would require another 29 horsepower to be picked up,again.... by NO means a small feat! On a 358" engine the difference between 2.875 to 3.07 is 70 horsepower! In terms of engines like this, that is no mole hill, that is a mountain!

[LiL Jack]

Originally Posted by johnta1

cptinjak, thanks for the info on your head.

How long did it take to make Jack's head?

He said 3 1/2 months, but that seems long for a CNC'd head.
Also, the head still needs port work when you're done maching it?

It looks like a great head and will make some serious power.

3-1/2 months was from start at the word go. David had to do all the CAD work on it and thankfully he had a Pontiac block there.

As I said before it would have been done in three months but there was an issue with one of Davids machines.

David said he could finish the ports, but Gaby wanted to finish them his way specifically for a PA car.

[Scott Roberts]

Originally Posted by LiL Jack

3-1/2 months was from start at the word go. David had to do all the CAD work on it and thankfully he had a Pontiac block there.

As I said before it would have been done in three months but there was an issue with one of Davids machines.

David said he could finish the ports, but Gaby wanted to finish them his way specifically for a PA car.

I'm sure Visner could have done a great job finishing but Gaby has a proven record that I would have gone with too. Look forward to seeing it run Jack. Best of luck to you. You are much better off with the Visner head over the Warp 6 head!

[T Syron]

Let say...these heads set the pontiac world on fire....would visner ever consider casting these heads for the common folk?

Thanks,
Tom Syron

[65nss4spdGTO]

Originally Posted by T Syron

Let say...these heads set the pontiac world on fire....would visner ever consider casting these heads for the common folk?

Thanks,
Tom Syron

Visners business is making billet cylinder heads for many different brands and applications. Speaking with David at PRI, we talked at length about the cost of development and the profits associated with production.

Cast iron cylinder head cost point can be reduced based on the number of units sold, so like any business man would ask, how many cast units could be sold? High end production cast cylinder heads from Profiler, Dart and others for BBC and SBC would range from $5,000 to $8,000 ready to bolt on, so how many sets of Pontiac heads could be sold in a year at those price points? Add new manifolds, valve covers and other items and the cost to change over a race engine would be around $10k to $13k.

Calvin Hill
Hill Performance
708-250-7420

[cptinjak]

Originally Posted by johnta1

cptinjak, thanks for the info on your head.

How long did it take to make Jack's head?

He said 3 1/2 months, but that seems long for a CNC'd head.
Also, the head still needs port work when you're done maching it?

It looks like a great head and will make some serious power.

Like LiL Jack said, the 3.5 months was with all design, CAD, and a broken machine delay. On an order for a head that is already designed, our lead time for a set of billets is closer to 10 weeks. 90%of our heads are sold finished. That is valve jobbed, polished, and ready to assemble. We can sell them at any stage of completion though. Some people like them with little tiny ports, no seats, no guides, etc. Most people want us to do the finish polishing though.

Jack