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  #11  
Old 20th May 2019
needspeed needspeed is offline
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Originally Posted by randy3934 View Post
so you didn't remove the pistons? the jugs are marked "F" and "R" not the pistons, new rings and cylinder honing?
Actually the Keith Black 292 pistons ARE marked front and rear because they have intake valve reliefs and the dome is canted away from the spark plug so they are not interchangeable.

Did you check valve to piston clearance when you put in the R5s?
It seems the clearance must be close if just the positioning of the head and cylinders can make it hit. Anyway you didn't change the pistons and it ran before you took it apart, right?

There was another recent thread where some Keith blacks had hit the head. Not sure if it was ever determined what the cause was. The pistons or something else.

Glad you got it figured out and thanks for posting what you found.
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  #12  
Old 20th May 2019
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Did you check valve to piston clearance when you put in the R5s?
....
No, I didn't, but I remember I installed them loose the first time in order to properly align the manifold, so I must have aligned the heads the same way, and just had a brain-f@rt on this reassembly.

I think those KB pistons need to say something about that. The shop I had bore/hone the jugs (.040" over) sold me the 40-over pistons, and thought they'd be fine with the R5 cams.

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  #13  
Old 21st May 2019
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  #14  
Old 21st May 2019
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thought they'd be fine with the R5 cams.
That's an assumption. I never trust those guys (assumptions).

I check everything. 3 times at least.

It sounds to me like your going to wind up with a bit less than 20 thou clearance one the heads are re-torqued.
That will be OK as long as your not revving the engine. Above 6 grand you might be touching piston to head. I set my aquish to 40 thou. It's a bit on the generous side but I do rev my engines. I could pick up a tiny tad mire torque going closer but I won't risk it.

You also need to check valve to piston clearance and between valves. I go to R type valves with the bigger cams. They all have smaller base circles than the stockers and that upsets the geometry.

When you have everything just right the pistons will tell you that the next time you pull it down. With clearances set correctly carbon wo't form in the valve pockets.
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  #15  
Old 21st May 2019
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Actually the Keith Black 292 pistons ARE marked front and rear because they have intake valve reliefs and the dome is canted away from the spark plug so they are not interchangeable.
that's good to know, thanks.
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