does this # fall in the 68 to 71 everyday car and truck

 

C8AE-H heads were used on 1968 - 1971 360, 390 and 428 passenger car and light truck FE engines. The C8AE-H flow 200-220 cfm and support 400 hp, a stock C8AE-H is probably 440 at best. If you have C8AE-H, C7AE-A, D2TE-A (C8AE-H should be stock) then you have what they call GT heads. They are still an FE, the motor is still a 390, but they have a lower exhaust port in relation to the bolt pattern to better fit Fairlane and Mustang, commonly in the 390 GT and GTA, thats how they got their name. They also have a 14 bolt pattern that is different from the 16 bolt pattern on the CJs in both number and location of bolts.
390GT heads have 14 bolts on the exhaust side, 428CJ heads have 16 bolt holes on the exhaust side.

390 GT heads are not any different from 390-2V heads. Casting numbers can be C6AE-U, C6AE-R, C7AE-A, C7AE-L, C7AE- (nothing), C8AE-H and a few others. These same casting numbers also appear on 390 2V and 4V engines with 8 bolt exhaust pattern.

428CJ heads started 1968 model year with the same 14 bolt pattern and casting number C8AE-J. Around January 1968 production was changed to use the new CJ exhaust manifold that had a 16 bolt pattern. At that time a new head casting came out, C80E 6090-N which was also drilled with 16 exhaust bolt holes.

GTE's with the 427 engine used C8AE -J and C80E 6090-N heads drilled for 14 bolt pattern.

C8AE-J and C80E 6090-N heads were also used as service replacement for 1963-65 427 Low Riser and in this application were drilled with 8 bolt exhaust pattern.

Any post - 1966 FE head casting can be drilled for 14 or 16 bolt exhaust pattern and many have over the years so the exhaust pattern by itself doesn't mean anything.
Are your heads the standard style with eight exhaust manifold bolt holes (not CJ)?

 

gona try ta get a better pic up



that did not work gona try again

 

 

They are in fact eight hole design, WOW thanks for all the info Papa T

 

found out that the driver side cyl has a crack between cylinders five and six

 

That's what I was going to add here, he wasn't real clear on the exhaust bolt pattern. C8AE-H could have either the 8 bolt or 14 bolt pattern. If you find them with a 16 bolt pattern, that could have been some of my old heads