CLASS RACER FORUM - View Single Post - chev 4-7 firing order change

Adger Smith · 11-19-2018, 09:19 PM

Big Cu.In. Hi HP Chevy engines will usually kill the # 4 main if the firing order is not altered. It can also smooth some of the pulses out in the intake manifold, too. The first altered firing order cam I used came from Lunati back in the early 70's. Some guy named Chris told me I needed it.
Draw out the firing order across the intake plenum to see where the air goes as well as the power pulses hit the crank.

11-19-2018, 09:19 PM	#4
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: chev 4-7 firing order change Big Cu.In. Hi HP Chevy engines will usually kill the # 4 main if the firing order is not altered. It can also smooth some of the pulses out in the intake manifold, too. The first altered firing order cam I used came from Lunati back in the early 70's. Some guy named Chris told me I needed it. Draw out the firing order across the intake plenum to see where the air goes as well as the power pulses hit the crank. __________________ Adger Smith (Former SS)