If you have any issues with running hot these March under pulleys will compound it. Ask me how I know. They dealt me misery until light came on in my head. Joe
Throwing pulley/alternator belt
- Thread starter Revoke36
- Start date
-
66340SEDAN
FABO Member #3649
Agree, if missing this will cause this. When I first got my engine together my belt would come off n the burnout box at the track, then be warm at the other end, put it back on but it did this a few timeS. Found out the spacer in the alternator where the bolt goes was too wide and stuck out a little, ground it down some and it never happened again. But I agree with others, get the correct pulley on there too.
jos51700
Green Bearing thread connoisseur
Some of those brackets have an offset bent into em. Yours looks flat. I'm wondering if it's original. I saw more than one alternator in the core bin at the salvage yard with brackets still stuck on it
My belt would come off at High RPM's I put a shut off switch on the alternator. Never threw a belt. But that was at 8500 and above. I have cars here that spin 7500 all day and the belts stay on. You have the wrong pulley on the alternator . You can change the space by adding space behind bracket at the pump and behind the spacer at the head. If you do just one the alternator will be crooked.
Here is the difference. It is about 1/8 but being crooked will also contribute to off set
Here is the difference. It is about 1/8 but being crooked will also contribute to off set
Ahaa ! A man of the 60's I see. Did this to all our drag race cars. Click off in the burnout box,click back on in the shut down area.
Dale Davies
Well-Known Member
The Boss 302 and Z 28 had deep groove pulleys for just such operation. Those suckers were built to rev.
If you watch the belts with a dial back timing light you can watch the belt at RPM. Possibly an idler from a sepentine system on the back side of the longest free length will damp the whip. Does not need to be in constant contact, just say 1/16" to 1/8" away.
Agree on checking crank pulley diameter.
I used to kick mine at 7500 until I went to a small diameter moroso crank pulley. Idle voltage was too low however, so I went with a medium size CVF, that was the ticket.
I don't recall exact size. IIRC stock was over 7 inches. Moroso was around 5, my cvf is 6
This little 5 Inch is the one I have sitting on a shelf somewhere. Idle charging was too low for my liking, For anyone's reference.
Moroso 64700: Crankshaft Pulley Pre-1972 Chrysler 340-440 - JEGS High Performance
-
