Gentlemen, I am looking to purchase a set of manifolds, but the owner does not know the correct engine size they will accomodate. A part number is stamped on each manifold. Will these numbers reveal the answer to my question? If so, can anyone decode?

380001LH and 398704RH

 

380001 1963-1970 LH; X-over. 350

398704 1966 RH; 330. Standard issue manifold.

 

X-over? What does this mean?

 

I believe he means that this manifold is a passenger's side crossover manifold. It has an opening on the bottom so the exhaust can crossover on the bottom from the driver's side. It also has an opening to the back so the exhaust can exit to the rear of the car.

 

Those numbers sure look familiar.I bet you could find those on a 70 W31 350.