So if you read the marine firing order backwards it IS the same as the regular Y.  Interesting.

John - "The Hoosier Hurricane"

Y-Bock reverse rotation firing order is 12736845. Hope this helps.

Link to answer http://www.marineengine.com/boat-forum/showthread.php?386813-312-reverse-rotation-firing-order

1956 Fairlane Victoria (ORREO)

 

Overlooking Beautiful Rimrock AZ

For some reason I thought they were the same as normal rotation. I had one of them but didn't think to check the firing order. If my understanding is correct its got a solid timing gear that turns the cam and distributor in reverse. Thats the best I can do, sorry! Chuck in NH

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

I will ask again. Can anyone give the firing order of a reverse rotation marine Y block. And please, not just the standard one backwards. REAL NUMBERS of real cylinders. Thanks Pete

I beleive John Mummert did an article on the firing orders in the Y block mag back some time ago. The Y block firing order produced the most horsepower, the SBF was the smoothest, The Scrub order it was baffling as to why it come about because it wasn't good for anything. Thats why the Nascar scrubs were making the swap to the Y order. Michael Waltrip got caught and fined for it a few years ago.

As you mention it may have been a bad dream because the Y is best as it is, its the other brand that needs help.

55 Vicky & customline

58 Rack Dump, 55 F350 yard truck, 57 F100

59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?

Thanks for the input on the firing order post. As I was saying, my reasoning behind the change was that it improved the performance of the yblock. I cannot for the life of me remember the details, but at the time I thought it sounded like a good idea. Maybe it was a bad dream. As for the exhaust sound of a yblock, yes, it is unique compared to other engines, to say the least. For me, not better, not worse, just different. Hope I am not stomping on toes on that thought.

The Argentina Phase II Y-Blocks used the 289 SBF/ 390-428 FE firing order.  This was to accommodate using cylinder heads that mimicked the SBF heads in valve layout.  As Steve & Tim mention, the hot setup for the scrub engines is the 4-7 cylinder swap which effectively makes those engines having the same firing order as the Ford Y-Block and the Flathead Ford V8.  The new Mustang 412HP Coyote 5.0L V8 (normally aspirated, non direct injection) also uses the Y-Block firing order so it looks like the firing order has now made the full circle.

Lorena, Texas (South of Waco)

sorry, that's wrong. it would be reverse fireing order with the valves opening oposite, intake first.

 lincoln/merc. y-blocks &mel's                                                               bucyrus, ohio.

it should be the same only in the other direction.

 lincoln/merc. y-blocks &mel's                                                               bucyrus, ohio.

While we are on the subject of firing order in a Yblock, can some tell me the firing order of a reverse rotation marine engine? Just curious. Pete