Stealth ported 915′s

I did these for a .450" lift , 4412 class rule build. I was planning to use these on a street stock build I was going to build myself. The deal fell through so I figured I’d share ‘cuz I thought they turned out pretty good.

They started life as a ’915 J casting that I stripped down, Roto-blasted and inspected. Years ago I had heard of a technique where you used salt water to rust the "machined" surface to restore a cast look and since the class I planned to use these does not permit porting, I figured these would be the perfect candidate to try it. I always use a Chev valve stem diameter of 11/32" so in went some fresh bronze liners. Considering quite a bit of material would have to come out going from a 1.88" to a 2.02 valve I used a carbide seat forming tool on the VGS-20 to get me a little further a lot faster.

Stock they flowed a peak of 216 cfm @ .425" and stalled hard at higher lifts.

They now move 240-241 cfm @ .450 and up. I will say that the "porting" was really only bowl work and s.s. work–absolutely no pushrod pinch work was done as I feel A- It wasn’t necessary and B- I don’t think I could disguise that quite as convincingly.

In my area a good engine in this class will make about 1 hp/ci. I feel these heads would get me to my goal of 1.10 hp/ci or about 400hp and 363 cubes.

What do you guys think from the pics? They aren’t as textured as I thought judging from the amount of rust that had accumulated over the course of 2 1/2 months. But I really think that after running they would be really hard to spot-especially to the average tech guy that only speaks Chevy. J.Rob

Attached Images

	stealthport915 002.jpg (110.9 KB)
	stealthport915 003.jpg (78.6 KB)
	stealthport915 004.jpg (59.6 KB)
	stealthport915 006.jpg (72.5 KB)
	stealthport915 007.jpg (100.0 KB)

I did these for a .450" lift , 4412 class rule build. I was planning to use these on a street stock build I was going to build myself. The deal fell through so I figured I'd share 'cuz I thought they turned out pretty good.

They started life as a '915 J casting that I stripped down, Roto-blasted and inspected. Years ago I had heard of a technique where you used salt water to rust the "machined" surface to restore a cast look and since the class I planned to use these does not permit porting, I figured these would be the perfect candidate to try it. I always use a Chev valve stem diameter of 11/32" so in went some fresh bronze liners. Considering quite a bit of material would have to come out going from a 1.88" to a 2.02 valve I used a carbide seat forming tool on the VGS-20 to get me a little further a lot faster.

Stock they flowed a peak of 216 cfm @ .425" and stalled hard at higher lifts.

They now move 240-241 cfm @ .450 and up. I will say that the "porting" was really only bowl work and s.s. work--absolutely no pushrod pinch work was done as I feel A- It wasn't necessary and B- I don't think I could disguise that quite as convincingly.

In my area a good engine in this class will make about 1 hp/ci. I feel these heads would get me to my goal of 1.10 hp/ci or about 400hp and 363 cubes.

What do you guys think from the pics? They aren't as textured as I thought judging from the amount of rust that had accumulated over the course of 2 1/2 months. But I really think that after running they would be really hard to spot-especially to the average tech guy that only speaks Chevy. J.Rob

Attached Images

	stealthport915 002.jpg (110.9 KB)
	stealthport915 003.jpg (78.6 KB)
	stealthport915 004.jpg (59.6 KB)
	stealthport915 006.jpg (72.5 KB)
	stealthport915 007.jpg (100.0 KB)