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

[GW]

The hot rodders have tried a 4/7 swap for years. It's nothing new. You 
can order a custom cam for the swap. Some say it makes a difference, 
others say it's smoke and mirrors. Some long time drag racers running 
dynos have seen very very small improvements in one situation and losses 
in others. It seems to complement or un-complement engines based on how 
their intakes are flowing. The general consensus has been not only is it 
trial and error, but the gains are less then noticeable and a crap shoot 
at best.

Gary
Indiana



Thomas Tornblom wrote:
> MikeLDrew at aol.com wrote:
>> In a message dated 7/1/06 19:51:07, cengles at cox.net writes:
>>
>> <<         Thanks for that information.   It clarifies the lack of a 
>> "4/7 Swap Cam" for our Clevelands, since they already have it.  >>
>>
>>>>> Uh, no.  They don't.
>>
>> Bill wrote:
>>
>>>  When Ford changed the V8 firing order for the 351 and 5.0 engines, 
>>> they 
>> implemented the "4/7 swap."
>>
>>>>> He is speaking about the fact that the firing order was changed 
>>>>> sometime 
>> in the 80s on the 302 and 351W.  The earlier small-block Fords 
>> (including the 351C) utilize the older, less-efficient firing order.
>
> Umm, I don't think so.
>
> The old engines, from about 63-64, both big and small blocks, used the 
> 1-5-4-2-6-3-7-8 firing order. The Cleveland, the 351W from 1969 as 
> well as the HO 5.0 engines use the 1-3-7-2-6-5-4-8 firing order, so I 
> think you got it backwards. Or why would they change to an inferior 
> firing order?
>
>
>>
>> Or so it seems to me...
>>
>> Mike
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> Thomas
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