This is an experimental manifold based on the 380 HP 409, 3814678 production intake. GM work order Number -18005-147, ECR36915, L-59270. THIS INFORMATION COMES FROM COLVIN’s BOOK. It is my opinion, that this open plenum concept went on to become the late 1962 1/2 service package intake (3822929). Speculation on my part. Others can e-mail me their thoughts on this.
$625.00 plus shipping…..SALE…$559.00 PLUS SHIPPING