Johnny Dart
Well-Known Member
Interesting. Did you have it shaved for some compression ?
Look forward to seeing it run.
Look forward to seeing it run.
It's only had .002" milled just to make sure it's clean and flat. Chamber size is very close to stock at 58cc. The chamber was cast to be the same size as the open chamber. Dutra says they were going to experiment on the quench for fuel mileage, but I have no idea how they were going to do it. Most all the slant sixes I have seen have the pistons down in the hole about .180". Ain't gettin no quench with that. These pistons are .007" in the hole at TDC. The compressed thickness of these steel gaskets is .020", so my quench distance is tight. I have the good ARP rod bolts so I'm not looking for bolt stretch. It was either go about .027" quench distance, OR use a .045" compressed thickness gasket for .052". So I went tight. I don't plan on much past 5500 so we'll see. I ain't skeered. lolInteresting. Did you have it shaved for some compression ?
Look forward to seeing it run.
Thats some good head.It's a 1977 casting. According to Doug Dutra, Chrysler only made about five, maybe less. It'a a factory closed chamber slant 6 head. They were never supposed to make it to production, but somehow this one did on a 77 Aspen. I stumbled upon it on ebay. I had it ported, had 318 valves put in and I enlarged the spring pockets for the Comp 911 big block spring. Here it is unassembled and freshly ported.
View attachment 1716401093
LOL. Thanks If you look at the valve springs, their size really gives it away. They are huge in diameter (1.550) compared to stock.That’s a nice head!
Thats some good head.
It looks massive, too bad you have to cover it up.LOL. Thanks If you look at the valve springs, their size really gives it away. They are huge in diameter (1.550) compared to stock.
I know, right? The stock cover won't fit either. I have to get a valve cover spacer a member here makes. The 318 valves are about .300" longer than the stock slant valves, so the rockers hit the cover at full lift. That's ok though. Just one more thing to work through.It looks massive, too bad you have to cover it up.
Likely not! I'm kinda excited about this build. It has my factory closed chamber head on it. It should be impressive.Spacer with stock valve cover will look good, won’t even notice it
Yes. I used B3 rocker relocation shims. Also, since I used a reground cam, I did not have to go with different pushrods. All the valve train mods kinda cancelled each other out.RRR, I didn't scroll back, but did you raise the rocker shaft, and longer pushrods, along with using the longer valves? If not you will probably have a geometry problem. Might want to check with B3.
Lookin' good, Rob.So, I went ahead and did the pressurized timing chain oiling mod to this new engine. Here is a picture. Or two.
View attachment 1716402176
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Oh yeah. It's gettin all cleaned up. And no, the Ford mannyfolds are gonna stay Ford. LOLLookin' good, Rob.
I'm learning lots here.
A couple of questions though, Are you going to mod the Ford exhaust manifolds in the bottom left to work on the new head?
And, are you going to scrape the orange paint and rust off of the gasket surfaces before final assembly?
To me, it looks like you are potentially going to have a bad leak there if you don't...
I did, yes. Now I find myself needing another early A slant oil pan. I thought I had another, but I don't. It's always something. LOL That's gonna have to wait a bit though.Did you ever find the stock early valve cover you were looking for?
I actually did get a pushrod length checker and decided to go with longer pushrods, @Charrlie_S. The difference was about 5/8". So I thought that was too much, so I ordered a set of longer ones from Smith Brothers. They'll be here soon.RRR, I didn't scroll back, but did you raise the rocker shaft, and longer pushrods, along with using the longer valves? If not you will probably have a geometry problem. Might want to check with B3.