409 Chevy Engine 409 Engine Header Covers
The 409 header selection story isn't pretty. Unless you're ready to omit or slice the stamped-steel inner fenders on your '58-up Impala, you're stuck with puny 131/44-inch Tri-Y headers that kill power on a free-breathing stroker like this. Superior modified a set of 2-inch Bassett small-block Chevy 4-into-1 boat headers to accept AVH Technologies 409 header flanges for the dyno test.