sparks coming out of my headers
 

yes I have a 355 cid sbc totally refreshed motor new cam bearings new rod and mains new howards cam new howards lifters new k-motion springs 600 lift. cam is 573 lift.new rebuilt powerglide new clutches in it refurbished 5000 stall converter. when at tree and pushed transbrake down stomped ongas sparks started coming out of headers and car ran second and a half under it normal speed. looking for reason for sparks coming out of headers. any info would be appreciated

way lean is my 1st thought.

Clearin' out the carbon !

What do the plugs look like?

x2 Crank it after dark and see if the headers are glowing.