|
|
|
|
Original Message
|
| Yup, you can drill it if the head is 1966-later. |
| By Dave Shoe - 10/26/2001 2:02:10 AM; IP 216.243.158.23 |
If the part number on the head is C6 or later, then it's got the eight extra bosses (4 visible, 4 not visible except from inside the water jacket).
Drill only as deep as the factory holes, or else you may hit water. There are a few different ways to properly locate the holes without mismatching the ports or hitting water (due to missing the hidden bosses), but careful calculation and measurement will generally get you through.
Be sure to use a "bottoming tap" so you have full-cut threads which go sufficiently deep. Regular taps have excessive taper and should only be used to start the thread. A fairly OK bottoming tap can also be made by grinding the tip off a regular tap so that the full-thread section goes sufficiently deep.
Shoe. |
|
|
This thread, so far...
|
|
|
|
Post A Response
|
|
|
|
|
|