Chevy small block, rams horn exhaust manifold. very good manifold if you wanna run OEM cast-iron. Casting numbers are a little hard to make out, but I believe they are, RH3747038, LH3748865. Has bracket cast into the manifold and also includes a bolt on bracket. These are a good condition with no cracks. Let these go for $45 for both plus shipping if needed. Livingston.