4/7 swap

shrimp · Post by **shrimp** » Mon Mar 06, 2006 1:47 pm

I know this is an old topic, but I would some more info. First off can you just swap the 4 and 7 plug wires on the dist. cap and go racing or is there more to it than that. Can you swap the firing order on any cam or is there certain cams that you need to use.
I am curious just trying to build a little more HP in my circle track motor. Its just a stock 350 with 2 barrel cast iron intake and a holley 4412 carb. The cam is hydraulic and 502/516 lift.

Doug Schriefer · Post by **Doug Schriefer** » Mon Mar 06, 2006 1:51 pm

No you can't just change the wires, the camshaft must be ground to run with the new firing order.

Keith Morganstein · Post by **Keith Morganstein** » Mon Mar 06, 2006 6:43 pm

You must have the 4/7 swap cam and then you can change the firing order on the distributor to 18736542.

highVE · Post by **highVE** » Mon Mar 06, 2006 10:32 pm

Shrimp,

I have used some swap cams in my circle track stuff. most of which were in Late Models, or Pro-Stocks. Did they make more power on dyno??? Some yes and some no. depends on alot. To be honest, you could probably find a few more Hp elsewhere, like in the piston ring package, or the valve-job. A really good VDL carb will go A LONG WAY, but may be out of your budget. If it were me, i wouldn't waste the effort for an application like yours.
Good Luck racing!

Mike Theroux
www.mikesportingservice.com