Has anyone had any experience with these headers?

http://store.summitracing.com/egnsea...115+4294925023


Would the shortys be a better option than the full length?

 

the full length would typically be better. the stepped design is proven for power, even though the smaller initial primaries on these wont support much more than probably 420hp.
i doubt anyone has actually gotten these since they are still pretty new.

 

1-1/2" is pretty small for a 350. Even the bigger end of them (1-5/8") is on the small side for a 350. I have the 68470's on my 350 (same header, but the whole tube is 1-5/8) and it will probably make more power than those stepped ones on a 350, as they are even almost too small for a healthy 350.

 

What size should I look for for my motor? By then end of summer I am looking at 400+ hp.