[mike leech]

Originally Posted by Stan Weiss

If you get your HP peak to 8600 and it holds on like you say, I think you will be leaving some et on the table if you only shift at 9000.

Stan

True. Unfortunately we never had a good outing in the car. The runs I made were shifted at 83 to 8500. There's more left.

Trying to control piston speed some. And there's no sense beating the snot out of it when the car was obviously not performing correctly on the starting line. We realize we need to shift higher. We just need a little time.

[65nss4spdGTO]

Originally Posted by mike leech

True. Unfortunately we never had a good outing in the car. The runs I made were shifted at 83 to 8500. There's more left.

Trying to control piston speed some. And there's no sense beating the snot out of it when the car was obviously not performing correctly on the starting line. We realize we need to shift higher. We just need a little time.

I'm not exactly sure of the stroke in this engine, but the piston speed is right up there with NHRA Prostock engines.

If you compare Mikes projected 9000 RPM, it's like turning a small block 350ci engine to 12,000 RPM.

At these piston speeds, you are on the edge of maintaining the integrity of specific alloys within the rotating assembly.

Best of luck to you and your team!

Thanks.

Calvin Hill
Hill Performance
708-250-7420

[mike leech]

So.... Now we take a break to discuss heads. Johns a bad dude. The heads are not what some think or say. The valves have not been moved. In fact the factory installed seats are still in place. The valves are as large as will fit in the stock location. Ti intake...but still a stainless steel exhaust valve. Theres only so much you can do to them .....

[greggutknecht]

What cc is the intake port?

[mike leech]

Originally Posted by greggutknecht

What cc is the intake port?

I don't know. There's a pushrod on one side of the port, a head bolt on the other side. Valve cover rail above and almost nothing to Seal a valley pan underneath. Never measured them for volume.

The real answer is not big enough. And that's the truth.

[mike leech]

As for headers.... Another piece of the puzzle where everyone goes wrong. If you're going to make north of 1000 hp you're going to need headers that are made for the engine your building. You're not going to buy them for $600 or even $800. You're going to drop your car off at somebody shop he's going to charge you probably two to $3000 to make you headers. Maybe more.

Or you can build your own. I made mine and I still had $1500 in material. That was on the super cheap. I made my own collector starting with The cheap OBX Collectors off of eBay. Made a megaphone and reducing cone speced by Scott. Yes they are stepped Hatters. The first tube is big the second tube is bigger and the third one is too big. I'm not going to say sizes and again it's a relevant to someone else's Engine anyway.

[mike leech]

.....

[john marcella]

Originally Posted by mike leech

I don't know. There's a pushrod on one side of the port, a head bolt on the other side. Valve cover rail above and almost nothing to Seal a valley pan underneath. Never measured them for volume.

The real answer is not big enough. And that's the truth.

Pretty good description. Lol

[Stan Weiss]

Originally Posted by mike leech

So.... Now we take a break to discuss heads. Johns a bad dude. The heads are not what some think or say. The valves have not been moved. In fact the factory installed seats are still in place. The valves are as large as will fit in the stock location. Ti intake...but still a stainless steel exhaust valve. Theres only so much you can do to them .....

Maybe someone has some better graphics software than the freeware I use. The fact that the head is on an angle does not help. I am getting around 2.25-2.3" for the intake and around 1.8" for the exhaust.

Stan

[mike leech]

Originally Posted by Stan Weiss

Maybe someone has some better graphics software than the freeware I use. The fact that the head is on an angle does not help. I am getting around 2.25-2.3" for the intake and around 1.8" for the exhaust.

Stan

So quick math will tell you that a 2.3 intake and a 1.8 exhaust will not fit in a stock valve location. This head utilizes a stock valve location.


I really do wish they were that big

[johnta1]

Maybe someone has some better graphics software than the freeware I use. The fact that the head is on an angle does not help. I am getting around 2.25-2.3" for the intake and around 1.8" for the exhaust.

With the 1.8" exhaust, 2.25 would be about as big as can fit.

2.3" would work but the exhaust would probably have to be around 1.7" or less.

The original valve seats may need replacing though for this size, though.