4 7 and 4 7 2 3 swap cams

[wideopen231]

So if swap cam is cheese burger the others are not worth having because no cheese? Burger w/o cheese is just money in trash can. Around my house cheese is food group and in most every meal .LOL

[dreracecar]

but if are lactosse intorerant, you dont need the cheeze in order to satisfy your hunger and it gets the job done

[masracingtd1167]

You guys are making me hungry !

[ricardo1967]

Like I said before,  if the swap made any significant gains and all the racer had to do was swap 2 wires, why would the cam grinder offer any other verson??? Isnt the purpose of a cam grinder is to make a better product.

Well Bruce, I have a different perspective here. They can charge extra $ for the 4-7 swap. Basically the same reason why McDonald's offers hamburgers and cheeseburgers.

Gosh, what have I done... 
Bruce, Lactaid pills help!

[wideopen231]

but if are lactosse intorerant, you dont need the cheeze in order to satisfy your hunger and it gets the job done

Good analogy and funny too.

[coupemerc]

The 4-7,2-3 switch (18726543) firing order is actually the same as the small block Fords if you look at the way Ford assigns their cylinder numbers.

From Dave Reher..."The order that we call the "4-7 switch" (1-8-7-3-6-5-4-2) has produced 5-8 more horsepower in our pro stock engines and was a well kept secret by racing teams for years."

[dusterdave173]

Exactly my experience--like I said before big inch high RPM units seem to like it a little bit
most other applications not so much--

[dreracecar]

I had lunch with Ed Iskindarian and asked him about the swap, Got a chuckle out of him

[ricardo1967]

I had lunch with Ed Iskindarian and asked him about the swap, Got a chuckle out of him

C'mon Bruce, spill the beans man...

[dreracecar]

They grind them on request, But not really a consistent gain to warrant a production.

  What he did say was that "Grumpy" had him make a few sets of roller lifters that the rollers were offset so he could adjust cam timing to each individual cyl just by swaping lifters.  I sumize that he had is cam grinder do a standard profile without letting him know what the true numbers were and having his secrets known

[Frontenginedragsters]

It seems like in our industry whats new is really old just re-packaged.
Yes Ford did the same thing in 1969 when the 351W engine came out.
Ford changed the firing order to even things out.
The 4-7 swap was not used when I was a nitro crew guy but it became standard many years ago.
My two oldest sons work on Tim Wilkersons nitro F/C so I keep up thru them.
Now the 4-7-2-3 is the norm. It gave them a couple of extra runs on a crankshaft.
The guys to ask about HP would be the Pro-Stock or Comp guys as mentioned already.
I think for what most of us are doing the benefit would be not noticeable.

That's my offering.

Matt Shaff

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