Any piston to valve clearance prob with AFR 165's?

5ohCOUPE · 03-08-2003, 06:26 PM

I have a set of Windsor Jr's im selling which had 1.94 intake valves in them. I didnt want to go any past .510 lift in fear of a valve saying hello to a piston. Im buying a set of AFR 165's which have only 1.90 valves. Im going to put a set if 1.7 rockers on this cam I have now which will bring the lift to around .540 with .218 duration @ .050. Will there be a problem with a stock piston or will it be safe??

88workcar · 03-08-2003, 06:30 PM

That combo will be good, We have a car with a set on a stock bottom with a HR266 it it with the factory 1.6s on it also. It works fine.

Technick · 03-09-2003, 12:39 AM

Nothing to worry about with that cam, as long as the duration is 230 degrees or less measured at .050 lift, even with Trick Flow Twisted Wedge heads, you could have as much as .600 lift if the duration is right. Remember it is WHEN the valves are open NOT how much the valves open.

03-08-2003, 06:26 PM	#1
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	Any piston to valve clearance prob with AFR 165's? I have a set of Windsor Jr's im selling which had 1.94 intake valves in them. I didnt want to go any past .510 lift in fear of a valve saying hello to a piston. Im buying a set of AFR 165's which have only 1.90 valves. Im going to put a set if 1.7 rockers on this cam I have now which will bring the lift to around .540 with .218 duration @ .050. Will there be a problem with a stock piston or will it be safe?? __________________ 91 LX COUPE, 3.73 gears, 2 1/2 inch H-Pipe, 1 5/8 MAC long tube headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam,1.7 TFS Rockers, TFS Track Heat heads, TFS Track Heat intake, T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 190 GPH in tank fuel pump. And more to come.

03-08-2003, 06:30 PM	#2
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	That combo will be good, We have a car with a set on a stock bottom with a HR266 it it with the factory 1.6s on it also. It works fine. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

03-09-2003, 12:39 AM	#3
Technick Registered Member Join Date: Feb 2003 Location: Seattle, Wa. Posts: 175	Nothing to worry about with that cam, as long as the duration is 230 degrees or less measured at .050 lift, even with Trick Flow Twisted Wedge heads, you could have as much as .600 lift if the duration is right. Remember it is WHEN the valves are open NOT how much the valves open. __________________ No matter how much you spend, or how much you prepare, there is ALWAYS someone else faster or quicker than YOU!!!!!!!!!!

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