67 327,300hp

[Patrick O.]

I have a 1967, 327, 300hp engine. No power extras. I'm having trouble finding the right fan belt. My car was very original when I bought it. My water pump pulley and my crank pulley are both 7" in dia. The alternator pulley is 2 3/4". The quanta book says that I should have a belt with the last four numbers of 7710. When I bought the car the Alt brace on top attached to the manifold and not the top bolt of the water pump. When I had this setup everything fit fine with the 7710 belt. When I got what was suppose to be the right brace according to the judging manual that I bought from LIC. My belt barely fits . Its at the end of the adjustment. Quanta said the next belt for a 350hp belt would fit and work but it would be the wrong number. Do they check for the right number when judging? Anyone else have this problem? Any help would be appreciated. Pat

[Duke W.]

Re: 67 327,300hp

Many GM service belts are different than OE because GM consolidated a lot of part numbers to reduce inventory. In many cases they are wider and longer. There was not a thorough engineering evaluation for many of these consolidations, which can cause problems when buying replacement belts, and the aftermarket keys off the GM service number, NOT the OE number.

So what do you do?

The first thing is to call GM Customer Support, 800-222-1020, and ask for the "restoration package" for your year car. (They will want the VIN.)

This package includes a data set known as the "AMA Specifications", which includes exact dimensions for all the OE belts for each engine configuration. You can then use these dimensions and online catalogs or go to a good parts store with a full paper catalog and find the closest, if not the dimensionally exact replacement.

Many so-called "reproduction parts" may "look correct", but are functionally off-base and belts and vacuum advance controls are two examples.

The other thing you need to verify is that all the pulleys, brackets, etc. are correct for your car. This can usually be done by using the AIM and JG as guidelines as neither is necessarily error free and conflicting information can be tough to resolve.

[Ian H.]

Re: 67 327,300hp

Sounds like this information would be valuable.

I called 800-222-1020, and asked for the "restoration package". However, when I gave my address, she told me she could not send it to a Canadian Address and gave me a Canadian number to call. At the Canadian number, I was told they don't go back further than 1977 unless the car was originally sold in Canada.

If someone has the 1967 restoration package, would you put info on this discussion board if there is not too much to type in?

Thanks...

[John H.]

Re: 67 327,300hp

I have the Quanta-specified belt on my '67 327/300 (no options) and the original alternator adjusting brace that attaches to the water pump bolt, and it fits fine with the 693 alternator and original pulley - the alternator adjusting bolt ear is exactly centered in the slot on the brace.

[Henry S.]

Re: 67 327,300hp

I have the Quanta-specified belt on my '67 327/300 (no options) and the original alternator adjusting brace that attaches to the water pump bolt, and it fits fine with the 693 alternator and original pulley - the alternator adjusting bolt ear is exactly centered in the slot on the brace.

John,

I also have a 327/300 no option '67 with 693 alternator and I believe the correct pulley. The one difference I have is the 327/350 aluminum valve covers instead of originals. The belt I received from Long Island (Came from Quantra) seemed too short but they said it was correct when I questioned them. In fact, when I put it on the car the alternator is right against the valve cover and there is no adjustment. I ended up putting the belt back on that was on the car when I got it, which was configured the same except it seemed to be an inch or so longer. Would the aluminum valve covers make that much difference? I remember there was a thread about the 327/300 belt this past winter.

Thanks,
Henry

[Henry S.]

Re: 67 327,300hp

Patrick,
Here's a thread about the fan belt.

https://www.forums.ncrs.org/showthre...56094&uid=7585

Good luck,
Henry

[Patrick O.]

Re: 67 327,300hp

Thanks for all the information. I will contact Them with my VIN . Is there a place to get the AIM sheets or JG? Does NCRS check numbers on fan belts when judging? Pat

[John H.]

Re: 67 327,300hp

Thanks for all the information. I will contact Them with my VIN . Is there a place to get the AIM sheets or JG? Does NCRS check numbers on fan belts when judging? Pat

Pat -

The Assembly Manual and the JG are both available from the NCRS on-line store ("NCRS Store" item in the blue bar at the top of the page). Yes, belts are a judged item.

[Timothy B.]

Re: 67 327,300hp

On my 63 300HP, the alternator belt is listed in the GM parts book as being 55 1/2". The Quanta belt measured at 55 1/2 and it put the adjustment approx 1/2" from the end of the adjustment brace and the alternator almost on the inner fender.

What's interesting is the 340 and fuel injection alternator belt is listed at 54 1/2" but the engines have larger pulleys. When I went to Carlisle I exchanged the belt for a 54 1/2" and the alternator adjustment is just short of halfway in the adjusting slot, looks much better also.

[Gerard F.]

Re: 67 327,300hp

Tim,

Exact same problem on my 67 /327/300 with its original alternator brace but aftermarket aluminum pulleys for the Vintage Air. The correct Quanta belt (from Paragon) puts the alternator adjustment bolt within 1/2" of the end of adjustment.

So I keep another Quanta belt which is 1" shorter in the back of the car for when the correct belt stretches out, or breaks. Haven't tried it yet but it should put the adjustment bolt right in the middle of adjustment on the brace.

Never had this problem until I put my orginal brace back on. The replacement I had, had a longer slot in the brace.