[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

[60man]

Originally Posted by mike leech

Whatever it wants

Did it tell you ?
😀
Just curious as I run mine a little tight to help the hammer effect...
at least in my feeble thinking.

[60man]

Originally Posted by mike leech

Like I said whatever it wants.

Should have read this first.

[bad69bird]

Originally Posted by Half-Inch Stud

Is this Thread sanctioned by the ECM?

Of course it is! Mike is from our Midwest chapter! LOL

[dci]

Mike, This is an awesome thread and will hopefully help shed some light on engines of this caliber for those that are not normally exposed to them. These kinds of threads are very much needed in our small community. As you already know so many guy's don't know what all is involved in making even 800 HP. I know some of the build you cannot or will not expose, but please show as much as you can. Thanks for sharing !!!!

[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.

[BB70]

Very nice chamber work, I think 2.25 x 1.74 . Thanks for the look inside your engine Mike.
John

[mike leech]

I gotta get busy....i just found out we had hiccup with the dyno. Now we are dynoing Thursday!

[LiL Jack]

EHTTFMF

[JSPONT]

Nice welds also, is that you welding the headers and pan? If it is you are multi talented!

[PAUL K]

Originally Posted by LiL Jack

EHTTFMF

^^^Truth^^^

[mike leech]

Yes. And all the chassis too. Gotta be when yer poor folk

[seancarole]

WoW you're one bad mamajama each year you push the PONCHO to a new level of Excellence!!! Thank You SR .

[mike leech]

Thank you. We try.....

[Chris Uratchko]

Nice effort. Mike is a pretty talented dude. He's built nearly everything in the car himself. Guys like him and Marcella seem to have a drive to go way above and beyond. I wish I had that drive. But, no time for that.

[mgarblik]

We had a 2.250" intake and a 1.800" exhaust in our heads with stock valve location. Very close together. So much so that on nitro and at high RPM's due to the large stem to guide clearance required, they hit each other. We reduced the exhaust head diameter and increased the stem diameter to 3/8". Problem solved. Normally aspirated, 2.250/1.80 would work OK even with a 5/16" intake stem, but I wouldn't build a max effort engine with those sizes. I would think a larger intake and slightly smaller exhaust would be a better choice, which is probably what Mike chose. Good luck on the dyno.

[Chris Uratchko]

Exhaust valve size is critical in n/a engine as well. Pumping losses and camshaft compromise shows up fast in n/a engine ... can't mask it. Exhaust is equally important as intake in n/a.