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That is mostly an old wives tale, run it because you like the sound or just because you want too. 650lb springs are not going to stretch a chain...
Double roller is perfect for 99.9999 percent of all engines. If you are super serious and making 1500 or more horsepower most would run a Jesel...
Or you can REALLY DRIVE IT!
Your car is just fine, this is the correct advice. Drive it for AT LEAST 1/2 hour.
I fought with the mount and pump on my 66 on and off for years. I finally bought a new mount and pulley from Buchillion performance and converted...
If you didnt lift the distributor and rotate it, change the plug wires around, or change the timing gear orientation, you did not change anything.
Stock pan, with a gromet style seal, works every time. See post #12 in the below link.
727 dipstick tube leak
no, you may get a few drops. I jack the rear of the car up on an angled drive way just to be sure.
not to mention, there is nothing to wear out...ever.
Or just run a detroit locker in your existing rear-end. No matter what anyone says they are totally streetable. You would never know its in mine...
I broke one of the helical lockers. See post #7 and up.
Rear end experts
Stock stealth heads. Right out of the box. Mid 12's after a 80 mile drive in 90 degree heat.
Later i had them CNC'd, LOW 12's @109mph...
I have swapped the single switches into the other rear door it works fine there, i am leaning toward the master switch as well.