Timing mark and brake question

norville · Post by **norville** » October 25, 2006, 7:08 am

Hello folks,

I have 2 questions I hope you can answer.

1: How far away from the "0" mark on the pully is 10 deg BTDC. I can find the "0" but no other markings on my pully(internally dampened right?). Is it an inch or the length of a 1/4 dollar, nickle,,what ???? I need to set the base timing so I can adjust the carb and idle. Most seem happy with about 10deg btdc.

I was told by the PO I have a 1964 390 from a demo t-bird.

2: I installed the power pedals from a 72 on my 65 . Do I need a brake return spring on my brake pedal???

thanks

bob

ICEMAN6166 · Post by **ICEMAN6166** » October 25, 2006, 9:29 am

each 2 degrees is about 1/8 inch spacing. 10 degrees is roughly 5/8 inch.
i think thats a couple degrees more than needed as mine are @ 6 btdc.depends on cam and other aspects though.

not sure about the return spring but the only ones i have seen on our trucks are on the 61-64 style cabs with the single pot.cant recall if there were any on the 65-66s i parted out. i dont know the reason they were used, but i will guess because of the pressure operated switch.

jakdad · Post by **jakdad** » October 25, 2006, 9:37 am

You can buy the "timing tapes" to put on your balancer. Look at Jegs or Summit. Oreilly may carry them.

norville · Post by **norville** » October 25, 2006, 9:55 am

Thanks for the replies.

Iceman, that makes seems correct. The 65 single pot had it and my 72 does not.

The timing tape sounds good, I'll have to look cause I only have a 1/4" of room.

Supposidly this 390 is worked over. It has headers and a 4 barrel. I have reciepts for balancing and honing I think bores are at 4.05?? From the work sheets. I'm not sure of the crank and cam. I have the numbers just have not researched the parts.

thanks again,
bob