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Beginner mistake.. My engine builder
installed a 351W type roller cam in my 331 but I set the valve lash as if it was a 302 cam. I installed the intake manifold already. Will I have to take the intake manifold off to re-set the lash? I relied on seeing the intake and exhaust valves opening and closing to properly set the lash.. Any tips??
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Are they solid rollers or hydraulic? Either way, they should be set the same since the 351W takes the same cams as the 302 as far as I know.
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It's a hydraulic roller cam.. I think it's an issue
because the 351W has a different firing order than the 302. A 351W cam grind is different than a 302's, hence the different firing order.. I set the valve lash following the 302 firing order...
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As long as you can establish TDC for piston number one firing position, you should be able to set the lash by accuratley rotating the crank the proper amount to bring all of the pistons to there proper location in three steps. I would refer to a manual to give you the rotations (expressed in crankshaft degrees) for a 351. I also think that late model 302's (5.0L) use the same firing order as a 351. You need a good manual, but I don't think you need to remove the intake. Good luck.
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That is only true of early 302s. Somewhere in the late 70s/early 80s they switched to the 351 firing order. Even if it was an early style cam I think only 2 cylinders are different, so those would be the only 2 to check. Now....you said that you adjusted the valves by watching the lifters lift and drop..... if that's the case, you weren't using the firing order anyway, you probably adjusted them correctly if you were adjusting according to the lifters.
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You don't need to remove anything except the valve covers, it's just a valve adjustment.
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You can find the bottom of the lobe by marking the crank pulley when the valve is completely open IE: pushed all the way down.Then rotate the crank one full turn and you will be in exactly the right spot to set that valve.Repeat 16 times and you will be done with perfectly adjusted valves!!
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Thanks for the tips. It's a '78 or '79 block (D8 or D90E-6015 or 6-E3A) which I think is pre 5.0 L.
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It really doesn't matter what year the block is, the firing order is set by the cam. Set your firing order on the distributor by the cam and adjust the valves the same way you would any other hydraulic lifter cam. If you need some help with that, just ask away.
Bob |
An even easier method:
Remove the spark plugs,makes it easier to turn over I always do 1 cyl at a time ,starting with 1 ,go 12345678 Rotate the crank clockwise until the intake valve has fully opened and set the exhaust valve. Continue rotating the crank until the exhaust valve begins to open and set the intake. This works for any cam in a small or big block Ford. |
firing order
Hello
Do you still need help with the firing order? The 351 firing order is:13726548. It is the same as 302Ho The 302 firing order is:15426378. The biggest question is, Is it A solid or Roller cam? This will determine what valve lash you will use. Remember the more you rotate the engine the more you ware the parts. So try to turn it as little as possible, Or get a good drill to pump the oil pump as you work. Paul |
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