standard chevy firing order is 1 8 4 3 6 5 7 2 ..two cylinders #5 are side by side and firing in sequence...may cause a crossfire condition...by changing the cam lobes on #4 and #7 cylinders -you change the firing order to 18736542..removing that problem
@ted850760 the reason its good to do the 4/7 swap ,, is that until RPM builds , there is a problem with 5 and 7 at low speed , the plenum at low speed might starve #7 , with a single plane intake , i've heard of people changing one over to a 4/7 swap , and not picking up any ,,
Those are not pro 1 heads..They are Canfields
pbrmotorsports 2 years ago
standard chevy firing order is 1 8 4 3 6 5 7 2 ..two cylinders #5 are side by side and firing in sequence...may cause a crossfire condition...by changing the cam lobes on #4 and #7 cylinders -you change the firing order to 18736542..removing that problem
ted850760 2 years ago
@ted850760 the reason its good to do the 4/7 swap ,, is that until RPM builds , there is a problem with 5 and 7 at low speed , the plenum at low speed might starve #7 , with a single plane intake , i've heard of people changing one over to a 4/7 swap , and not picking up any ,,
levisnteeshirt 1 year ago
whats a 7/4 swap cam??
Damo384 2 years ago
i love the way 4-7 swap cams sound, i was so happy with my cam.
campaug 3 years ago
> campaug
The 7/4 swap introduction was definitely a great innovation into the field of Chevrolet motorsports.
AwesomeEngines 3 years ago
i dont like those heads. its a shame its not IR injected.
aaron9696024 3 years ago
The best dyno pulls on the net !!!!
SnottyAust 4 years ago 2