1956 Exhaust Manifold Restoration

[James R.]

I'm in the process of restoring my 1956 Corvette convertible and am wondering if a heat riser or spacer is required on the two 4 barrel. Engine is 225 horse, second design.

TIA
Jim

[John C.]

Re: 1956 Exhaust Manifold Restoration

Hi Jim,

I believe the '56 2nd design requires a 3 bolt flat gasket/thin heat riser as opposed to a '57 that uses a doughnut type gasket.

John

[Mike M.]

Re: 1956 Exhaust Manifold Restoration

heat risers were originally installed on the 265 56's regardless of early or late exhaust manifold type. mike

[Edward M.]

Re: 1956 Exhaust Manifold Restoration

Mike hits the nail on the head again. The three bolt 56 heat riser valve is unique to 56. The 6th edition of the 56-57 Judging manual has a nice picture of an original part.