Vetterbegood

I have a 505 stroker in my 70 with AFR heads and built valvetrain including stud girdles. So that requires tall valve covers and moves my alternator over some requiring a 56" fan belt. No power accessories. Redline is 7400 and that throws off fan belt even with all deep groove pulleys and a .69" x 32 deg belt. Don't want to switch to serpentine. Anybody have an idea on some fix ? A tensionor or ???

Help !
Keith
amg at insightbb.com
Thanks !

1320mm

Had the same problem with a 498 in a drag car that is seeing 7500 rpm. I used to throw the alternator belt every pass. After switching to a Moroso 64800 5" dia alternator pulley and a Gates Powerated v belt I haven't thrown a belt. They are green belts that are made for mowers but won't stretch like a normal v belt.

L71Ragtop

can we see a picture of how the belt is routed
sound like you need a idler pully

TimAT

GM used the captured belt as the upper right diagram shows on the hi performance BB cars. I beleive they used the same setup on the A/Production SCCA cars of the day.

Jud Chapin

Be sure u are using premium belts as they don't stretch.

Vetterbegood

This is a great idea, I'll try it first !
Thanks to everyone for the help !!
Keith

7T1vette

You can try those belts with less stretch. But, if that doesn't work, you will likely need 1 or 2 idler wheels on the long {unsupported} run of that belt or some 'guide-shoes' for the backside of the belt in those unsupported areas. For that high RPM stuff, idler wheels would be best.

oldschoolvette

or move the alternator to a mid mount that would decrease belt run, my 582 turns 7500 and I don't throw the belt

bracket was only about 60 bucks

BB2B

make sure the pulleys line up. Mine did not without a spacer under the fan pulley

dmaxx3500

make sure your not twisting the alt out of alignment