The y-block timing order - which was the flathead v8 timing order - is one of the best ways of beating torsional stress in the crankshaft. Basically developed by Ford to make life easier on the old three main crank, I'd say.

Has to do with which throws are delivering power - and which are pumping air, relative to the flywheel.

 
 Steve Metzger       Tucson, Arizona

Until recently my son worked for one of the top Nascar shops and he knows that several of the GM teams did the 4/7 swap.There was only a very slight,if any, power gain,but the engines ran a lot smoother,which helped the durability a lot.

 

Paul,

Boonville,MO

Rob, if looking for more power for his engine, paint it ford blue, that should help also.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

Thanks guys, i have searched the web for 4/7 swap and found some stuff.



Y block billy I will never put a CHEVy engine in my ford. That would be a shame. The Y block is outstanding!

My brother have a Chevy 350 that i will try to put some performence into. Changing the firing order is one of the thing that makes it one step closer to a realy performence engine!



Robin Norway

Do you plan on putting that 350 *&%# in that Victoria on your Avitar?

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?

I am pretty sure Crane Cams sell a scrub cam a Y-Block spec . ( 4-7 swap )?? .

Henry Ford nailed the firing order with the flathead  in 1932 . The 4 outer ( 1,5,4 8 )cylinders fire, then the 4 inner cylinders (6,3,7,2). All of this  means better engine  harmonics and more torque .

Lon

yblocksdownunder

Robin,

To find a cam and get info about it, search the web for "Chevy 4-7 swap" and variations of that. You will want a standard sbc timing chain and follow the instructions for an sbc - don't confuse the engine families.



Rick,

In a Chevy, 4 and 7 are at top dead center at the same time and because of that all that's needed is a cam swap and to swap plug wires.


Lawrenceville, GA

Pardon my ignorance, but surely if you are changing firing order you would have to check that the crank is amenable also. It wouldn't do much good if the the cylinder is trying to fire when crank/piston is at bottom dead centre.

I wouldn't think that just changing the cam would overcome this. I remember back in the mid eighties one of our touring car V8 GM teams was experomenting and ended up racing at Bathurst with a completely modified crank cam combination. From what I remember, they called it a square crank configuration. He blitzed the field that year. His name was Peter Brock. I would imagine that was alng the line of what your are talking about.

Regards

Rick - West Australia
Do Y Blocks Downunder run upside down? Gravity Sucks!!

Cool! The engine i have on my hand is Chevy 350 smal block. Does not know the year at this time. Do you know where i could find out what cam i should use ? Also, i guess the timing chain have to be changed to the 12-13 pins pointing toward the oil filter side ?

Do you know where i could read more about it ? Is this something smokey unik come upp with ? It just feels like smokey unik.



Best regards

Robin Norway

They were changing the GM's to the Y block/Flathead firing order in Nascar to get more power and Michael Waltrip got caught and fined for it. In one of the Y block magazines there is an article about firing orders and it says the Y/flathead is the most powerful, the windsor/smallblock ford the smoothest and the GM one wasn't good for anything and they don't know why it came about.

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?