Do we have a real SS in the garage?

[BULLITT65]

That makes sense, I just didn't think there was a significant difference between the two transmissions. I know the gearing is different, just wasn't night and day for me when I have driven both. I understand what you are saying though when shifting you want one gear right on top of the other to stay in the power band.

[bc69]

Does the 2 Fuel line rule apply to also 7-8 ss's ?

[1968RSZ28]

Does the 2 Fuel line rule apply to also 7-8 ss's ?

No.

Paul

[bc69]

What does 68 have Paul?

[little_hoss]

It was my understanding, and correct me if I'm wrong,  that all the solid lifter cars (L78, Z/28, COPO), received a single 3/8" fuel line and the other small and big block cars had two 5/16" lines. One fuel and 1 return.

[1968RSZ28]

What does 68 have Paul?

All 68 Camaros had a single fuel line.

Paul

[bc69]

I always thought or understood if it had a 4bl q-jet it had 2
Lines. L48s and BB. All only in the SS's.  ??

[1968RSZ28]

I always thought or understood if it had a 4bl q-jet it had 2
Lines. L48s and BB. All only in the SS's.  ??

Not in '68, single fuel line for all engines.

Paul

[little_hoss]

Sorry, I was referring to 69's. 
 

[ko-lek-tor]

It was my understanding, and correct me if I'm wrong,  that all the solid lifter cars (L78, Z/28, COPO), received a single 3/8" fuel line and the other small and big block cars had two 5/16" lines. One fuel and 1 return.

Sorry, I was referring to 69's. 
 

1969 only: All V8 cars received a single 3/8in fuel lines 6 cyl= 5/16in.single . All Q-jet equipped cars LM1, L48, L35, L34, had an extra 1/4 in return line

[1968RSZ28]

Sorry, I was referring to 69's. 

Yes, in '69 all engines equipped with QuadraJet carburetors had two fuel lines.

Paul

[bc69]

I heard that the 4bl Q-jet had a perking problem that this helped to correct.
The needle/set/float could not hold the pressure and would flood or overfill
The vent relieved the pressures especially when hot.

[little_hoss]

It was my understanding, and correct me if I'm wrong,  that all the solid lifter cars (L78, Z/28, COPO), received a single 3/8" fuel line and the other small and big block cars had two 5/16" lines. One fuel and 1 return.

Sorry, I was referring to 69's. 
 

1969 only: All V8 cars received a single 3/8in fuel lines 6 cyl= 5/16in.single . All Q-jet equipped cars LM1, L48, L35, L34, had an extra 1/4 in return line

OK, thanks appreciate the information. I learn something new here everyday!

[1968RSZ28]

I heard that the 4bl Q-jet had a perking problem that this helped to correct.
The needle/set/float could not hold the pressure and would flood or overfill
The vent relieved the pressures especially when hot.

Here's JohnZ's explanation...

"Most Q-Jet applications use the fuel return line from the filter to ensure that there is no fuel pressure to the carb once the engine is shut off. Q-Jets depend on heavy fuel flow to keep the bowl full, as there's only one needle and seat feeding both the primaries and secondaries; they use a single large (.110"-.135") needle and seat, and with that much valve surface, it's hard for the float to keep the needle closed when fuel pressure between the pump and the carb rises due to underhood heat-soak after shutdown. Another issue to look for is if you use a windowed needle and seat like the stock GM one on the higher-performance Q-Jets, you should have the fuel filter with the check valve to prevent the fuel level from dropping in the bowl after shutdown; the "windows" are below normal fuel level, and as the fuel level drops and pressure rises as fuel evaporates, the needle and seat opens, and the fuel back-flows through the "window" and out through the return line. Then you have to crank and crank when you start it until the fuel level comes back up."

Paul