SCHOONS

Looking for a diagram of the firing order for a 79

'75

I don't know who's pic this is but it's good. #1 is on the left front of the engine and #2 is on the right front.

johnt365

7T1vette

The order is 1-8-4-3-6-5-7-2 in the clockwise direction looking down at the top of the distributor. But, the #1 plug wire can be made to work in ANY one of the available positions. Also, there are some camshafts that are made with a 1-8-7-3-6-5-4-2 order (supposed to run a bit smoother and make a smidgen more power).

To know where the #1 plug wire should be placed, find the compression stroke TDC for the left-front cylinder and see where the distributor rotor points. The #1 plug wire should be placed in that [respective] location on the distributor cap.

hardlanding

I never heard that, and not saying you are wrong, just wondering how that would play out with the timing in regaurds to the crank position?

davidchristopher

I think it swaps the compression/exhaust stroke with the 4/7 cylinder - the piston is in the same position during the rotation.

davidchristopher

FYI- they're the same for ANY small block chevy. Like, you could have totally googled this:

https://www.google.ca/?gfe_rd=cr&ei=...c+firing+order

Feed a man a fish...

MotorHead

If you are building a perfectly built big block engine and have a single plane intake matched perfect to the heads you may gain a few ponies across the board.

I have never heard any evidence of power gain for a 350ci small block chevy.

lars

You have to have a 7-4 swap cam in order to do this - you can't just swap the plug wires. I'm running a 7/4 swap cam in my 407 '64, and it runs exceptionally well. I've written the new firing order on my intake manifold so I don't forget about it when I do my valve lash setp: thumbs:

Lars