[DeTomaso] Techno question: 4/7 Swap Cams for 351Cs

[Charles Engles]

Dear Bill,

        Thanks for that information.   It clarifies the lack of a "4/7 Swap Cam" for our Clevelands, since they already have it.   

               Smarter now,  Chuck Engles
  ----- Original Message ----- 
  From: SOBill at aol.com 
  To: cengles at cox.net ; adin at frontier.net 
  Cc: detomaso at realbig.com 
  Sent: Saturday, July 01, 2006 8:47 PM
  Subject: Re: [DeTomaso] Techno question: 4/7 Swap Cams for 351Cs




  The Ford cylinders are numbered:

  Front Passenger Side 1,2,3,4
  Front Driver Side ...... 5,6,7,8

  The Chevy cylinders are numbered:

  Front Passenger Side 2,4,6,8
  Front Driver Side ...... 1,3,5,7

  The March 2006 Hot Rod Magazine had an article and dyno test of a Chevy with both types of cams.

  When Ford changed the V8 firing order for the 351 and 5.0 engines, they implemented the "4/7 swap."

  Chevy implemented this same firing order change on the Gen lll and lV (LS-series) engines. The Chevy engineers said the motivation for this change was to equalize the peak loading on the #2 and #4 main bearings. #2 loading went up a little and #4 came down a little. Every little bit helps.

  SOBill Taylor
  sobill at aol.com