RE: TR3A/TR4A exhaust systems interchangagbility

["Randall" <tr3driver@comcast.net>]

> 1. Will a TR3A's exhaust manifold fit a TR4A engine? Why not?

Yes, it will fit the engine.  Fitting the rest of the exhaust is more
problematic.

> 2. Why is the TR4A's exhaust system superior to a TR3A's?

The 4-2-1 design allows for better scavenging of the cylinders at midrange
rpm, resulting in slightly more power.  Kind of halfway from an ordinary
manifold to a header.

Randall