I need to know the firing oder for my 400sb..with a diagram please :):hurray:

Clockwise rotation 1-8-4-3-6-5-7-2 #1 on the cap should be left front terminal. Set the engine on compresison stroke for #1 cylinder and see where the rotor is pointing, that will be your starting point.

1,8,4,3,6,5,7,2 with driver's side f-r 1357 pass. side f-r 2468

Front of motor

1 ^ 2
3 ^ 4
5 ^ 6
7 ^ 8

BillL

Is this firing order the same for all GM motors 502 ETC...???

Is this firing order the same for all GM motors 502 ETC...???

Yes, All Chevy motors use the same firing order and rotation :)

Is this firing order the same for all GM motors 502 ETC...???

yes.

Yes, All Chevy motors use the same firing order and rotation :)


I thought so. Thanks Mat :thumbsup:

Is this firing order the same for all GM motors 502 ETC...???

Yes, All Chevy motors use the same firing order and rotation :)
Yeah, but not all GM engines use the Chevy numbering system, distributor rotation, and/or firing order.

I made this up a while back when I was changing out my distributor and wires. Hope it helps.

Dave

Yeah, but not all GM engines use the Chevy numbering system, distributor rotation, and/or firing order.

Pontiacs aren't the same - ask me how I know. :rolleyes: :D

Yes, All Chevy motors use the same firing order and rotation :)

:noway: I was surprised when I learned that this isn't true! I owned a C6 Corvette. The firing order for that was 1-8-7-2-6-5-4-3. Reference this post from Corvette Forum...

http://forums.corvetteforum.com/showthread.php?t=1968889&highlight=order+firing

:noway: I was surprised when I learned that this isn't true! I owned a C6 Corvette. The firing order for that was 1-8-7-2-6-5-4-3. Reference this post from Corvette Forum...

http://forums.corvetteforum.com/showthread.php?t=1968889&highlight=order+firing

Yes, the LS-series engines don't use a traditional Chevy firing order, but that's OK since they aren't a Chevy engine. They're a totally new design, sharing NOTHING with the old Chevy small-block except for the bore center measurement and most but not all of the bellhousing bolt pattern. They were designed (and produced???) by GM Powertrain, not Chevy--therefore--not a Chevy engine.

More-or-less the same thing goes for the 8.1 Liter truck engine; although it seems to be based a little more on the BBC than the LS is based on the SBC in that it also shares the same deck height, engine mount location, and exhaust flange bolt pattern as the previous truck engine.

More to the point of this thread, they don't have a distributor, either.

LS-series engines don't use a traditional Chevy firing order, but that's OK since they aren't a Chevy engine.

Ah ha. Wouldn't have looked at it that way, but understand your explanation.

http://www.joby.se/corvette/misc/firing_order.gif

ITS not complicated, pull the #1 plug and put you thumb over the hole tightly, turn the engine in the normal dirrection of rotation, with a breaker bar and scocket untill you get compression in the #1 cylinder, as the damper TDC line approches the TDC timing tab, drop the distributor in with the rotor facing the #1 cylinder,compensate for the way the distrib gear causes the rotor to rotate as in seats,so its seated pointing where you intended, if it won,t fully seat turn the oil pump drive with a very large flat blade screw driver untill it will,with the distrib removed and try again, once it seats,facing the correct dirrection, install and tighten the distrib clamp so its difficult to spin the distrib easily by hand but still possiable to spin the distrib by hand, re-install the #1 plug and wire, install the cap and all ignition related wires, use your timing light and set the ignition timing,per the shop manuals instructions, tighten the distibutor hold clamp so it can,t move, IF it takes more than 10 minutes your in need of more practice or nearly hopeless as a mechanic.