i have a set of 3998993 heads manufactured i believe in 1992 (J162 is the code on the heads) i have the heads manufactured from 1985 0n , the 1971 - 1984 heads were made for the 305, 350 and 400 sbc , i cannot find any referance for 400 heads after 1985 under this casting # i noticed that the 400 heads in the pre 1985 had the 1.94 int. and 1.60 ex valves where as the heads for the 305 and 350 engines had the 1.94 int. and 1.50 ex valves, are all the 1985 heads the same or are there a different head made for the 400 like there was for the 1971 - 1984 engines ? if so how can i identify them without removing them from the block and what valve sizes are common for these heads? i am just trying to figure out exactly what i have
i have checked on the mortec site and a couple others that i have and cannot find any reference for any 400 sbc heads with this casting #.
can someone please enlighten me or point me to a site that will help me determine what heads i have ,,,
thank you in advance for any help given