Originally Posted by 1971 Chevelle
I always thought you could order either because of header clearance issues.
AFR has part numbers for both straight and angle plug heads. Because very few people order the straight plug 210 SBC head, request for them must be handled at the beginning of the machining operation (special order = longer delivery times). The result is fewer used straight plug versions.
As for the advantages of the angle plug on the street, it's not enough to notice.
406chevelle, The AFR 210 is an excellent head, if you can make them work, buy them your 406 will love it.