3.9 heads...question

[Rovernuts]

I read the sticky heads question.............I have a set of ERC0216 heads that look to have the little carve out for the EFI .............My question is the stamping # also has a 7E652 under the ERC0216.............Can someone tell me what year and what model these were off so i can get the proper intake valve seals............i bought them at a flea market for my 3500S P6 ..........also is it advisable to just change the rockers themselves or do you have to change springs etc, and i'm assuming that they do change easilyor am i missing something

Thanks

[sidecar]

I read the sticky heads question.............I have a set of ERC0216 heads that look to have the little carve out for the EFI .............My question is the stamping # also has a 7E652 under the ERC0216.............Can someone tell me what year and what model these were off so i can get the proper intake valve seals............i bought them at a flea market for my 3500S P6 ..........also is it advisable to just change the rockers themselves or do you have to change springs etc, and i'm assuming that they do change easilyor am i missing something

Thanks

Don't know about the markings on the heads!

Don't change the rockers on there own, you need to change the shafts as well. You can get thick walled shafts from somewhere, they stop the shaft snapping at its ends!

Do you mean the springs between the rockers? If so then I would not bother, they don't do a lot of work. (This is only my opinion)

By the way when cut in half they make great "weak springs" for checking valve fit and that sort of thing!

If you mean the valve springs then they're as easy to change as any other head.

Pete

[katanaman]

There are only two types of seals available to my knowledge. A flat rubber tap washer type seal and the late push on cap type seal. The late ones need the valves guides machined to fit them. If your heads have the outer row of bolts (3 rows) the it will be the early washer type.