4/7 swap?

[El Rat]

Hi gents
Since I have to replace damn near everything: cam, lifters, rocker arms, pushrods, rocker studs, add guides and plates. Should I go for the 4/7 swap? If so someone recommend a great sounding hydraulic. If not I’ll stay with the SC hydraulic recommended by Don Jacks.

 

[MRHP]

Are you going to have the engine fully disassembled and inspected, or just top end work? I think a full tear down is in order with all the damage found.

 

[El Rat]

Engine was brand new! Less than 200 miles.

 

[MRHP]

And all the debris from the big pieces eating the small pieces went where?

 

[El Rat]

In the pan I’m not sure there’s any place else? So you don’t have an answer to the original question. It’s not rocket science...is the 4/7 swap worth the trouble?

 

[scott hall]

No I don’t think so. And I agree with Brian about pulling it down completely.

 

[Don Jacks]

No Gene,I don't think that it would make enough difference either for you to be able to feel or justify the likely extra cost.Since the cam's coming out anyway,I'd give that rear cam bearing a close look.Can you post a picture of the bottom of the lifters?

 

[MRHP]

I do have my opinion on the 4/7 swap. Wouldn’t do it. If you want to, great. I would not trust all the debris missed the rod bearings, main bearings, oil pump, settled in oil passages, etc.... I realize that’s not what you asked, just trying to help you avoid anymore unnecessary drama with this motor. They are too expensive to take any chances in my opinion. I hope you rethink your plan, for your sake.

 

[Carmine]

Am I the only one who doesn't know what a 4/7 swap is?? Thanks, Carmine.

 

[Don Jacks]

It has to do with the way the cam is made Carmine.The 4-7 swap means that cyls.4 and 7 swap cylinders when it comes to the firing order.

 

[63 dream'n]

Am I the only one who doesn't know what a 4/7 swap is?? Thanks, Carmine.

https://www.enginelabs.com/engine-tech/engine/firing-order-swaps-whats-best-for-your-engine/

 

[tenxal]

We've messed with the 4-7 swaps in our drag cars...nothing there on the dyno or track. If you're determined to do a 4-7 swap, the best thing is to do the double swap (4-7 and 2-3) and go to the LS firing order.
Std. firing order: 1-8-4-3-6-5-7-2
L.S. firing order: 1-8-7-2-6-5-4-3

With the LS swap, the engines we've done that on seem to run a bit smoother. But again, no dyno or track improvements that can be traced to the swap.

I can't think of any reason to go there on your project.

 

[El Rat]

Ty
I haven’t had a gas motor (except tow truck) since 1977. I can intelligently comment on blown alcohol or injected nitro but not gas powered anything.

 

[427John]

So it sounds like in all applications a 4-7 swap on a W motor is a waste of time and money?

 

[303Radar]

Even though I have a cam with a 4/7 swap, I'd say it is only a waste if you have tri-y headers or paid extra for the cam.

 

[Don Jacks]

In your case,Gene,it won't matter whether you do or don't ,so I wouldn't.If you were going with a roller cam,there's often not much choice since there's a problem getting the right cam blanks for the "straight" firing order blanks and the 4-7 is all that they have or can get.