Patrick Berryman

Has anyone in this forum flow tested an MSA 6-1 header before? I'm curious how many cfm their headers can flow and if it's enough for my engine. It has 1 1/2" diameter equal length primaries to a 2 1/2" collector. The primary tubes have 2.36 square inches of room for exhaust to flow (x6) and the collector/downpipe has 3.93 square inches of room for exhaust to flow which tells me that the 2.5" downpipe would become a restriction first before the primary tubes become a restriction. If that is the case, what is the total flow capabilities of a 2 1/2" downpipe and would that mean that the only difference between different headers is the type of bends and the length of the primaries for scavenging effect? Scavenging effects aren't my main priority, but I'm also curious what rpms do the MSA headers have a scavenging effect? I'm currently running an attempt at a port job for the cast manifold, but as I'm sure you all can predict, it is still horrendous and begins restricting around 4700RPM. Thanks.

Hi, I recently purchased my dream car, a late 1971 Series 2 Datsun 240z. There are many pieces missing and one of which happens to be the entire rear drum systems. I have sourced all of the new parts I need to put drums back on the car except for the most crucial piece: The Backing Plate. This part seems to be classified as "Unobtainium" for some odd reason along with some other parts. Is there anyone who happens to know a source for the backing plates or happen to be willing to sell an extra pair for a reasonable price? Thank you!