Response to question on how a Poly runs with hydraulic cam.		
												
		The cam seems to run fine at all rpm’s. However, since I’ve had the cam in 
since I rebuilt the motor I don’t know what a rebuilt engine would run like with the slid 
lifter cam.  The motor runs about 68 psi of oil pressure at anything above an idle so I have a 
hard time following that runs flat above 2400 rpm. thinking(*1)  I mean if the l;ifters are 
good at 1500 rpm 68 psi, wouldn’t they be good at 300 rpm with 68 psi? But then again,    
I’m not exactly known for a superior mind.							
		I actually researched it a little prior to having the old cam reground and 
found a guy who did a lot of work on poly 318’s. I made a call to him and he swore up and 
down that a hyd. cam was compatible with and old 318. Right now I’m away from home on 
business but I when I get back I can look up and get you his name and number. I’m sure he 
can tell you about some more of the technical aspects of this.					
		But on the flip side, since doing this , I’ve noticed some problems which may 
lead up to something eventually: I’ve  had to replace two lifters and two pushrods. One got 
some dirt or something  inside and the plunger locked in  the down position which ended up 
destroying the cup end of the pushrod, and the other had a retaining ring that failed and 
basically came apart and destroyed the cup end of the pushrod. 				
		I don’t think the lifters spin like they should. During the last disassembly for 
lifter problems I checked a couple of lifters and noticed the wear pattern showed the lifters 
were not spinning. 										
		This setup requires a custom length pushrod. I attempted to a maintain the 
factory geometry by comparing a factory lifter/pushrod with a dydraulic lifter measuring 
for the correst length. I don’t know if I actually got the correct length or not But I believe at 
least a few of the valves are being side loaded from bad geometry.				
					HustonDB@aol.com					
											
	*1 see Larry Jenkins letter