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Pampered-Z · 09-21-2011, 11:36 AM

The SBC 4-7 swap is an old school trick used allot when racing classes had intake/carb restictions. One of the issues with a small plenum volume was that the normal firing order resulted in the air flow in the intake to "reverse direction? between the #1/#8 and #2/#7 cylinders (I think they were the one), but baciscally starving the rear cyclinders. Changing the firing order elinimated the reversal from front to back,and made more power, the swap ( ala ford firing order, now LSx firing order ) does also place less stress on the crank, it is also why they sound different/smoother then a older style SBC.

I don't think those scents are ment for unleaded fuel? In the past they wern't. if you ant a nice smell, put CAM2 in the car!

09-21-2011, 11:36 AM	#10
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	The SBC 4-7 swap is an old school trick used allot when racing classes had intake/carb restictions. One of the issues with a small plenum volume was that the normal firing order resulted in the air flow in the intake to "reverse direction? between the #1/#8 and #2/#7 cylinders (I think they were the one), but baciscally starving the rear cyclinders. Changing the firing order elinimated the reversal from front to back,and made more power, the swap ( ala ford firing order, now LSx firing order ) does also place less stress on the crank, it is also why they sound different/smoother then a older style SBC. I don't think those scents are ment for unleaded fuel? In the past they wern't. if you ant a nice smell, put CAM2 in the car! __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!!