Even or Odd fire?

[FastGT31]

i have searched but cannot come up with is if a 3.1 is even or odd fire?

[Guest]

Even fire, all 660s are. AFAIK, only the early 3.8 Buick is an oddfire, maybe some very early 4.3s, but I don't recall that as a production thing or as a prototype only.

[geoffinbc]

For any inquiring minds there was a Buick 3.8L oddfire (common pin) crank, Semi even fire and a true even fire crank.

There was also the same for the 4.3L but the oddfire was only avalible as a raw forging from GM and can take mega power.

An interesting fact. The oddfire cranks are smoother at high RPM in the 90* motors.

[Superdave]

Yep.. 123456

[geoffinbc]

Your not implying that the 123456 firing order has anything to do with it being an even fire motor are you?

[Guest]

Your not implying that the 123456 firing order has anything to do with it being an even fire motor are you?

I really hope Dave would know better than that.

[Superdave]

I really hope Dave would know better than that.

No, i think in 3D

I was picturing the block firing in the right order...

[geoffinbc]

rrright