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From personal experience please do not buy the pro form rockers!!! I made that mistake about 8 yrs ago for my old 340. they are not even close to the 1.5 ratio they were advertising to be!!! The closest rocker was 1.47! The rest were around 1.4! There is a reason there around $200 bucks my...

Each engine is VERY different indeed! My hi-po 273 has never ran better then it does now with the eddy LD4B on it! Cleanes up the cruising speed a/f ratio & gave it low end torque it never had with the stock single plane!

ive decided to run adjustable rockers & push rods on this car. a little back story there motor was rebuilt not long ago & cam wasnt broke in rite (flatten a lobe) & no one could seem to diag it is i ended up with. Wasnt hard to pin point that one,any way up on inspecting every thing i noticed...

Hey guys worken on a 70 383 hp & was wanting know what the maximum difference in the valve stems installed is. So other clown has been working on this before & using a stright edge across the stems.is .030! That sounds like too much to me for non adj rockers! All the intakes are a bit taller...