![]() The original 1987 L-98 cam DOES have a fuel pump eccentric ground into the cam so you could use a mechanical block-mounted fuel pump on it if you got hold of an appropriate SBC fuel pump pushrod. Second, there's no way to mount the factory "spider" in the lifter valley to hold them down.Ĩ. ![]() The factory "dog bone" retainers will be way too far down on the body of the lifter and they'll get chewed up for sure. The lifter bores on an EARLY block won't take the taller factory roller lifters for several reasons. Flat tappet lifters in a roller block will look a little funny sitting way down in their bores, but they'll work perfectly.ħ. The lifter bores on a LATE model roller block will accept both flat tappet and factory roller lifters- the oil feed holes to the lifters are in exactly the same location. You can't physically bolt the gear to the front of the cam if you've got the wrong type of timing chain.Ħ. THIS IS THE MAIN REASON WHY YOU MUST USE A ROLLER CAM TYPE TIMING CHAIN WITH A FACTORY ROLLER CAM. The BOLT PATTERN and DOWEL LOCATION on the snout of the roller cam/top timing gear is smaller in diameter than that of a flat tappet cam. The roller cam top timing gear also has a different amount of "offset" to it to compensate for the longer cam snout and the thickness of the retining plate, but keep the chain itself in the same location as a flat tappet cam.ĥ. The snout of the roler cam is also ever so slightly longer overall than a flat tappet in that area becuase it's gotta slide THROUGH the rather thick (1/8") retaining plate and still have just a smidge of length left to fit snugly into it's receiver on the back of the timing gear.Ĥ. ![]() The factory roller cam is notched or "necked down" on the front 5/32" of it's length so that it slides THROUGH the factory retaining plate and has a "shoulder" for the retainign plate to push against to retain it from walking out the front of the block. Front end of the block where the snout of the cam sticks out is machined basically the same (no offset difference at all) but the roller cam block has two bolt holes drilled way out on either side of the cam to bolt on the factory roller cam "retaining plate" that fits between the block and the top timing gear.ģ. ![]() Cam bearings are exactly the same and you can physically shove either cam into either block type.Ģ. Many people want to shove a factory roller cam (including the popular "Hot" cam and other higher performance factory offerings) into an early block for obvious reasons or a flat tappet cam into a later model block for low cost and simplicity.Īnyways, here's the poop for what it's worth:ġ. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
February 2023
Categories |