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ChadS
09-18-2003 10:07:50
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Re: compression in reply to champspa, 09-18-2003 09:40:25
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It depends, how much of a dome is on the piston? You could use a .020 copper head gasket to boost compression I would say if you had the pistons that had a very high dome, 1/2in or more, with the 450 head, you could shave up to 100 off of it, just watch the piston to head clearence. You would also have to find the venturi for the 450 carb to get the flow you need to feed the engine. Are you thinking of putting on the 450 head? It is a good idea, it has a better intake port than the 8060 head. You can see the valves throught the ports on the 450 head, where the 8060, you can bearly see it. To get that compression, you must have the high dome pistons, the 450 head, shaved from 50-100 thou. You can install the copper gasket, it will increase the cyl pressure 10-15lbs. When I set the valve lash, I use a compression guage to check my work, I have found that no less than .015 and no more than .018 hot is the boundry line for finding peak cyl pressure, I also use the method, 1 valve completly open, and the other closed, and adjust the closed valve. 1 cyl at a time, and just adjust the lash until peak pressure is obtained. As long as you have the high domes, you should have no problem getting 170+psi, as long as you shave the head., Just do not go past 100 when shaving the head, You may need to use a set of calipers to measure how thick the head surface is to see what would be possible to take it down that far. Also use the calipers to measure how deep the chamber is in the head. A good cyl head should be around 1 inch, .250 deep. if you have a head that is over 1.5 inches deep, don't use it. It is a distillant head. Low compression head. Email me if you have any more questions. What is the bore size?? Chads
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