Chevy 350 initial timing?

[gm guy]

I am setting the timing on a sbc, and need to know the stock spec. Any idea? /forums/images/graemlins/dunno.gif

 

[Hossbaby50]

for a carbed motor the specs are

4* BTDC on a 305
6* BTDC on a 350

On a TBI motor

0*

on a TPI motor

6-8* BTDC

 

[84_Chevy_K10]

4* on a TBI 454 IIRC, 0* for a 350

 

[Hossbaby50]

He asked about SBC's. /forums/images/graemlins/waytogo.gif I will process the TBI 454 into my brain though. Good info to know.

Harley

 

[gm guy]

OK, thanks. Now were should the vacume advance be hooked up to?

 

[pauly383]

[ QUOTE ]
Now were should the vacume advance be hooked up to?

[/ QUOTE ]

Which carb are you running ? My q-jet (later non computer with bowl vent to canistor) has vacuum advance on the pass side front near the choke , and works perfect. /forums/images/graemlins/k5.gif

 

[gm guy]

It is a quad jet carb, the vacume was hooked up were you described but there was no vacume at idle. I hooked up vacume from another another outlet on the carb (wich did have vacume) and the timing light showed the same with or without it hooked up. This means the diaphram on the dist is faulty. Right? /forums/images/graemlins/confused.gif

 

[pauly383]

The vacuum advance is ported vacuum, you don't need it advanced at idle, only on accelleration and part throttle cruise . I would assume the distributor vacuum can is bad . Take the advance can out of the distributor, push on the rod , put your finger on the vacuum nipple and let go of rod , it should stay in one spot until you remove finger ( OR you could suck on nipple to see if rod moves ) /forums/images/graemlins/k5.gif

 

[Thunder]

Yup. I know my rod moves when I suck on nipples.

 

[supersize75k5]

jus t acall it good tinming whrn two gils and a guy get togthter at the same time i jhoe this works for me kayter