[482supersnake]

There are a few versions of the BT heads out there. They have the medium riser and the high riser versions. The high risers are a taller head altogether and BT doesn't make an intake for them. The port is just a raised version of the medium risers. Now there are two versions of the medium riser out there an early version and the current ones. also they have a 428 and a 427 valve spacing difference. surprisingly the 428 valve spacing heads flowed better. The current medium riser heads flow allot of air right out of the box and were patterned from the cnc heads that Barry used one one of his Engine Masters motors. I don't think the old version is available any longer. You can also switch to a 351c or 429/460 stud type rocker with guide plates if you like or you would need high riser rocker stands or go with a full aftermarket setup. On all of the heads the exhaust port is raised about 3/8 of an inch. Blue thunder also makes a few different intakes a single four that is close to the factory CJ intakes and the factory PI intakes from results that I have seen it out performs the factory Pi intakes. They also make a copy of the factory 2x4 that I think is pretty close in performances to the originals