ok finally,
Now we are getting somewhere and it is looking pretty good.
Bore= 4.185
Stroke = 4.250 (lots of grinding)
Head gasket thickness = .040
Piston deck ht = .005 in the hole.
Appx head gasket diameter = 4.200
Piston cc = -13.65
Real cubic inches = 467.6
Real static compression ratio = 14.91 - 1
Now we are talking horsepower with good living conditions. Took us two days almost to get here but this is the real numbers by the information you supplied.
Please understand that 18-00 -1 compression would blow it's self into pieces not too long after you got it started if you were racing it or running it on a dyno. That is why I had such a hard time believing what to you was simple. I am capable of getting engines to live and run with much higher compression for the circumstances than most builders can and this was blowing my mind.
Can you increase your head gasket thickness and keep same pushrods and rockers etc, by even .010 or .015?
If you can or if you can't, the next info we need from you are as much of the camshaft specs as you have and the rocker arm ratio. For sure I need lobe lifts, lobe separation angles, and duration @ .050
Just as it stands with a retard systen you should be able to spray 200 to 250 shot on it, if your piston and rings will handle it. I will know more when I see the cam specs. The SB 2.2 head is not nitrous friendly but guys do shoot it. The valve angles are too shallow and the chamber is too small. It is still workable though.
The Edlebrock N2o system was designed by Steve Johnson. The only phone number I have for him is personal but you can find him at
www.yellowbullet.com
In a section called Nitrous by Induction Solutions. He does work with Mud Racers.
Ed