Thread: Harmonic balancer on 454 has 4 timing marks.....

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yep 180 out but still need to fix the low cranking psi on the one bank .mark 5 or 6 block ? if thats a mark 6 with a flat lifer cam in it ?. i am short blocking the 330HP mark 6 merc roller engine right now

Originally Posted by pat mccarthy

yep 180 out but still need to fix the low cranking psi on the one bank .mark 5 or 6 block ? if thats a mark 6 with a flat lifer cam in it ?. i am short blocking the 330HP mark 6 merc roller engine right now

My heads spinning right now. LOL

Ok, When I bought the motor I was told the motor was the same gen block as my boats original 1993/454(whatever gen that is).

After recently talking to the dealer who sold me the engine. He said he thought it had rollers, knew it had merlin heads, a high rise weiland intake, an aggressive cam and a built, 30 over bottom end. Said he would get back to me on the exact cam specs(still waiting).

The motor was to be a drop in long block. I only had to add carb and accessories. I trusted the dealer and didnt pull anything off the motor. I just dropped in and hooked up.

After hearing of the possibility rollers the other day, I figured I would pull valve covers and check. Likely was going to do as I was getting ready to pull motor.

Of course, if it does have rollers and the motor is 180 out. I may be able to make adjustments and get back to normal possibly....right?

it not 180 off on cam timming . you need to line the top gear mark at bottom 6 clock and lower crank gear mark pointing to top 12:00 clock one more turn lines the gears in phase this will happen when you turn them crank one more time . if a roller cam engine there is not thust button on the front of the cam gear . not good. the engine i see is a mark5 or 6 if it has hold down towers casted in the lifter valley it a mark 6 mark 5 do not but is about the same block other then that .if a mark 6 roller engine it has a mark 4 cam in it. as the mark 6 has on step nose cam different timming set and needs a hold down plate .there is no cam hold down plate i see at can not be used with the mark 4 /5 cam it can have a roller cam with out roller rockers you will have to pull the intake to see if its a roller cam