terrawombat
New member
Quick back-story: bought a '64 Hatteras 34 Sportfish with non-running engines. Engines are not original to the boat and appear to be ~1975 Pleasurecraft 454 big blocks (GM). Engines were partially dismantled when I got them with random parts missing...such as spark plug wires. Rebuilt starboard cylinder heads and was in the process of trying to fire up these old engines when I came across a bunch of things that don't seem to add up.
My port engine is LH (CCW) rotation. The Pleasurecraft model/serial number tag states that it has a 1-2-7-5-6-3-4-8 firing order. This contradicts EVERYTHING I have ever read about a GM 454 engine - marine or automotive. Model number is PXLK-WR-R19.
My starboard engine is RH (CW) rotation. The Pleasurecraft model/serial number tag states that it has a 1-8-4-3-6-5-7-2 firing order. Again, another contradiction. Model number is PXRK-WR-L19.
The third contradiction is this, and I believe it makes the above two "issues" go away. My distributor rotates COUNTER-CLOCKWISE, which contradicts every service manual I have ever read on the GM 454 engine - marine or automotive. Since I have just about gone crazy with this I believe that since my distributor rotates in the opposite direction than it should, my LH and RH engines should have reverse firing orders (the ones I stated above) to what every manual and mechanic has told me.
Does this seem accurate?
Note: All rotations were viewed from the rear of the engine looking forward. Distributor rotation was viewed standing at the rear of the engines looking down.
My port engine is LH (CCW) rotation. The Pleasurecraft model/serial number tag states that it has a 1-2-7-5-6-3-4-8 firing order. This contradicts EVERYTHING I have ever read about a GM 454 engine - marine or automotive. Model number is PXLK-WR-R19.
My starboard engine is RH (CW) rotation. The Pleasurecraft model/serial number tag states that it has a 1-8-4-3-6-5-7-2 firing order. Again, another contradiction. Model number is PXRK-WR-L19.
The third contradiction is this, and I believe it makes the above two "issues" go away. My distributor rotates COUNTER-CLOCKWISE, which contradicts every service manual I have ever read on the GM 454 engine - marine or automotive. Since I have just about gone crazy with this I believe that since my distributor rotates in the opposite direction than it should, my LH and RH engines should have reverse firing orders (the ones I stated above) to what every manual and mechanic has told me.
Does this seem accurate?
Note: All rotations were viewed from the rear of the engine looking forward. Distributor rotation was viewed standing at the rear of the engines looking down.