Thread: 4-7 firing order swap cams

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Pat--Thanks! our discussion around here was on the "easier on parts aspect of the 4-7 swap, but the small gains in hp are always welcome, seem $30.00 is cheap to improve both!

Mike--Thanks for the article link! Supports much the same as what Pat learned. When the engine builders and the experts come to the same conclusions it's going to be good enough for me! I've had days I'd kill for 8 or 9 improvement on hp and torque at the rpm ranges the article and dyno results show the gains. Graphing out the gain @ rpm, especially with a 5 speed, one could alter his shift points a bit and spend more time per gear with the engine producing peak power! Some days it can make up the extra few hundredths a guy might need cuz some young clown treed me!!! Maybe a younger drive and the 4-7 swap would be even more better????

Originally Posted by Dave Severson

Maybe a younger driver and the 4-7 swap would be even more better????

Younger driver!!! Bite your tounge, Dave!!

Originally Posted by Dave Severson

Pat--Thanks! our discussion around here was on the "easier on parts aspect of the 4-7 swap, but the small gains in hp are always welcome, seem $30.00 is cheap to improve both!

yep all my custom grinds are 4/7 as they get used in max effort engines .a very small amount of more money . if it helps with bottom end parts crank then its worth it to us.one of my customers been using a 4/7 for many years with 400hp of Nos .crank is not the top of the line but allways checks out great .the 8000 + rpms and the Nos as well. i would of bet it would of been busted in two parts many years ago i can not say its only the 4/7 swap but for the price its a no brainer