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The 320 combustion chamber is 93 mm in the wristpin direction, and 90 mm in the thrust direction, the stock cylinder bore being roughly 87 mm. Very bad for combustion. I doubt the flame front will...

Paul, this thread keeps going on so fast that I seem to have skipped a few postings. Most of these posts apprear while I'm sleeping :D

Read and understand this before making decisions on rod length: http://www.epi-eng.com/piston_engine_technology/piston_motion_basics.htm

The 320 rod ratio of 1.9 isn't so bad after all, regarding...

I admit you are right. Have you measured flow yet?

Janderson's "miracle" head looks a lot like my '34-'36 233 head. The valves feature the same three dimples, and the head has very sharp outside corners. Spark plug threads are larger than the later...

I'm using Ferrea valves with 5/16" (8 mm) stems. The intake valve is lighter than the stock Buick exhaust valve!

Correct, it would work. But my 1:65 ratio rockers move the pushrods closer to the shaft only by 2 mm. That said, I'm still machining the pushrod holes in the head a little larger.

It's too early to say much about the cost. I'm not making these myself, just the basic design work. A machine shop will start making them soon, but I don't have a price tag yet. They will machine the...

One more picture!

Finally moving forward with this. This is the final design. 8 straight, 4 left, 4 right. I assume the 248/263 are same, only none straight, but 8 left and 8 right. The shaft diameter has been the...

Untame, did you have your hands on with this car?

http://www.youtube.com/watch?v=n8qUG0e4psw&feature=related

I think the head was cracked to begin with, but shaving the deck just revealed the cracks. This engine came from a '49 Roadmaster and had a bearing failure (spun bearings on three rods). The only...

No, still 4 injectors, aimed straight at the junction of the T. To my mind, there's not enough room for two injectors, as the head bolts get in the way, and you couldn't get them to shoot at the...

I'll second that statement!

We have been pondering about what happened on the dyno during our lunch break and why the engine fell flat above 3500 rpm. The only thing obvious was that everything was damn hot after the morning...

Twenty years ago we had at least ten shops who could repair a cracked head. Now I was able to find three shops that can weld a cracked cylinder head, or at least try.

1. A semi-retired man who...

My porter would be interested in the wall thickness here. He says a lot can be gained by making a smoother turn at this T

Who says the Singh grooves have to be on the head? They can be on the piston as well, if it closely matches the shape of the chamber like that, creating squish that way.

You should design the head so that it can be run with gasoline as is, and shaved for more compression with E85, or offer head gaskets in various thicknesses.

True with shrouding. However, I'm going to overbore the cylinders to 3.622" and that's roughly the diameter of the chamber. I was thinking of going with 1.880 and 1.500 valves. Even 1.900 and 1.600...

More on squish/quench. The Ford Cosworth engines will knock to death with clearances less than 1 mm, but run indefinitely with 1.2-1.4 mm. On the other hand, a guy with a 500+ hp Toyota 4-cyl runs...

A fellow has a 1.9 L Volvo engine, making 500+ hp with gas and 740 hp with E85. The E85 tolerates so much more advance and boost. You need to supply 30% more fuel with the E85, so you need big...

Excellent!!!
Are these cutaways of stock ports? There seems to be a fair amount of wall thickness to improve the exhaust port, but not that much on the intake.
Doug, do you also have a cutaway of...

Does anyone have cross-sectional pictures of a cut-up 320 head, showing wall-thicknesses around ports ?

Since you are redesigning a new head, I thought I'd throw in some interesting ideas. There seems to be consensus about the squish (quench) thickness to be either less than 1 mm or more than 3 mm,...