Re: Replacking Stock Heads
best way to tell is doin a leak down check....the way to do it is bringing the #3 cylnder to the compression stroke with both valves closed....then screw your compression tester in to cyl. #3 leave the gauge off and hook an air line up to it so u have compressed air running thru and in to the cyl #3 ....now as long as the #3 cyl is on the compression stroke with the valves closed listen to the tail pipe and the intake if theres air comming out from there u have a bad valve....if it comes out the radiator u have a bad head gasket...out of the oil cap bad rings....good luck
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347 stroker all forged,arp everything,stud mains w/girdle,7qt pan,full roller, custom cam, aluminum heads swirl valves 5 angle valve job.quick fuel 750,areomotive pump,cobras w/nitto drags,and m/t et drags for the track, ford racing 373 gears,centerforce clutch,tko500,underdrive pulleys,bassani x-pipe,flowmasters
^best et so far 11.6 1.61 60ft coming soon 9sec et's 
1992 mustang gt
2001 gmc 1500 4x4
78 century boat
92 skidoo
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