| Also known as | 70-4039 |
| Diagram | Fig. 11 — CHAINCASE AND CHAINS · ref 14 |
| Listed in parts books | Not catalogued by year yet |
GUIDE SEALED +.015
An oversize (+.015) sealed valve guide, cataloged under 70-6420/015S with the older number 70-4039.
This is a valve guide, oversize at +.015 over standard, listed as sealed. The old catalog number for this same part was 70-4039, so if you're working from an older parts book that's the number you'd find it under.
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Oversize guides like this one come into play when the original guide bore has been machined larger during a rebuild, either to true up wear or to fit a valve stem that's been reground. The +.015 marking tells you how much larger than stock the outside dimension runs, which matters when you're fitting it into the head.
We don't have much more detail on file for this one beyond what's in the description above. If you're not sure this is the right guide for your particular head, give us a call and we'll sort out fitment before you order.
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