NCRS correct bolt IDs

[Jim S.]

going to replace my engine mounts - would like tho replace the bolts with "correct 67 NCRS" bolts but do not know where to go to find what the correct NCRS bolts head markings are - checked with several suppliers - Paragon - Long Island - Corvette Central and no one can/committe to what to correct markings should be - does anyone out there know where to go to find out the correct head markings are - be it intake, exhaust to bumper to grill - you get the picture - Thank You Jim

[Edward J.]

Re: NCRS correct bolt IDs

Jim, have you checked with Rich Fortnier, his add is in the driveline with his phone number. great to deal with he may have what your looking for.

[Joe L.]

Re: NCRS correct bolt IDs

going to replace my engine mounts - would like tho replace the bolts with "correct 67 NCRS" bolts but do not know where to go to find what the correct NCRS bolts head markings are - checked with several suppliers - Paragon - Long Island - Corvette Central and no one can/committe to what to correct markings should be - does anyone out there know where to go to find out the correct head markings are - be it intake, exhaust to bumper to grill - you get the picture - Thank You Jim

Jim------


For the vast majority of bolts on the car, there is no singularly correct bolt headmarking. That's because many suppliers provided bolts for just about every application on the car. Generally, if a bolt has a period-correct headmarking AND otherwise of correct configuration, it will be considered correct. Some of the more common period correct headmarkings are "A", "C", "M", "TR", "WB", "RSC", "L", "EL" and many, many others.

The motor mount bolts TO BLOCK were phosphate-finished, trimmed head. As I recall, they were GM 280M material grade (SAE grade 5; 3 radial line). I think any of the above headmarkings and others would be acceptable.

[Grant W.]

Re: NCRS correct bolt IDs

Hi Jim
Here is some mid year motor mount bolts. One pair is RSC and the other is O with some lines. Some used a C with lines. Notice the correct nuts too. Hope this helps.
Grant