[Chevelle-list] Changing Firing Order On Cam

[Bill Lessenberry]

The idea behind the 4/7 swap is to eliminate the 5/7 firing sequence 
which can lead to cross-firing and detonation between those 2 
cylinders.  It's a problem only on high-revving motors, but it 
wouldn't hurt anything to have it on a street motor if you have $$$ 
to burn.  BTW, it's an old idea, I've seen stuff from the late 1960's 
that was written about it.  Seems to me that you're just swapping the 
problem from the 5/7 sequence to a 4/2 sequence, but I ain't an 
engineer or high $$ race engine builder.
BillL


At 01:28 PM 5/4/2007, you wrote:
>INFO I HAVE BEEN TOLD ABOUT THE  4/7 SWAP  IS IT WORKS BEST ON RACE 
>CARS AND YOU HAVE TO HAVE A CAM MADE FOR A 4 / 7 SWAP, LITTLE PRICEY ALSO.
>SS427
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