Hey, I will be using a 85' or 86' mercury that has a 5.0 fuel injection and how will I know if its a roller motor?: I always thought a roller cam meant having roller rockers and roller lifters? Thanks
it will have roller lifters, not rockers. the only way i know of to verify its roller motor is to take off the intake and see if it has regular lifters or roller lifters with the spider and dog bones that keeps them orientated correctly in the block.
A roller motor has a roller cam and roller lifters but not roller rocker arms, it should be a roller motor byt the year you indicated. When youi take the intake off you will be able to see the dog bones that hold the roller lifters in the lifter bores.
According to http://www.precisionengine.com/rebuilt-engines/ford-lincoln-mercury/index.html the 5.0 302 non-rollers didnt start being produced until 1987, which means you should have a roller motor. Unless the site is lacking other information.
Thanks!! Thanks for the infor. Also I assume that the roller cam is made out of a stronger steel than a regular cam, I keep hearing about you have to buy a steel distributer cam gear when installing a older type distributor?
It's questionable in those years if it's a roller or not. Some were and some weren't. Like was said, only way to know for sure is to pull the intake and see.
You don't have to pull the intake, only one valve cover, one rocker arm and pull the pushrod out. A roller 302 pushrod is 6.25" long. But be careful when pulling the pushrod, if it's not a roller, the suction can and sometimes does allow the lifter to come up out of it's bore if it's a flat tappet lifter. They'll come up just enough to clear the bore, then the suction breaks and the lifter falls into the valley. Shaking the pushrod will break the suction.
agreed. i pulled apart an '85 Crown Vic once and it wasn't a roller motor, but had a thottle body fuel injection setup on it.
Not sure about this but couldn't you just pull the distributor and see what kind of gear it has on it to determine if it is a roller cam or not? I think they use a different gear than a regular flat tappet cam does right? Or am I wrong as usual? lol clint
Roller engines use a steel gear since the cam is made of steel.the non roller dist gears are sintered iron and to soft to put up with a steel cam.Visually the gears will look the same.
Actually, most roller cams are NOT steel, they are cast iron SADI cores with selectively heat treated lobes and distributor drive gears.
