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pulled the horn off, pulled the jets the needles slide into, and the jets have no numbers on them. Am I stupid? I remember carb jets having the sizes stamped on them. This is a rebuilt carb out of Fl. I want better fuel economy, it is going on a 360 fe block, very stock, still has single exhaust, for now. Any help out there deciding which jets to put in? I was just going to get the smallest available, any drawbacks to this? Thank you
the intake is an edelbrock 390 performer, NOT RPM.
Get a copy of the Edelbrock IB for that carb and do your recalibration by their chart - the shotgun approach doesn't always work and with these carbs, the smallest jets without the corresponding rods wont help any engine. As far as numbers on those jets - find a magnifying glass - they are there, just very difficult to see(they probably are 1428/.100 for a 1405 carb and 1427/.098 for a 1406 ). You also may need to clean the green oxidation off - numbers are on the top side. Here's the manual: http://www.edelbrock.com/automotive_...406_manual.pdf
This is all that's inside - a 1405 w/electric choke added to it: http://i70.photobucket.com/albums/i8...rb6-2012-3.jpg
Oh and don't forget the springs under the rod pistons - they too need to correspond to any changes in jets and rods as well as where the accelerator pump link is assembled
Be best to buy the tuning kit,it has several jets rods and springs. Seems to me they are around $50.
The 'kit' for a 1406 is bare bones. The 'kit' for the 1405 has more choices and, of course, also more expensive. Both will have about every possible option available for the 600cfm carb - but that too gets pricy. Summit also sells the individual pieces if you really want to spend the bucksQuote:
Originally Posted by HWORRELL
Also FE and fuel milage shouldn't be in the same sentence. I'm pretty sure FE stands for Fuel eater ! :LOL:
I'll go from here.
With a 360 right at the top (bottom??) of the list. Gotta admit though, I've tried to 'kill' several with nary a whimper. I did have a '68 390 wagon that would top 19mpg and was by far the best of the lot as far as fuel mileage vs a Torino Fastback 390GT that might pull down 11-12 with a tail windQuote:
Originally Posted by HWORRELL
Here's everything you need to know to dial in an Edelbrock Performer or Carter AFB carburetor...
http://www.edelbrock.com/automotive_...ers_manual.pdf
A high-rise, dual-plane intake such as the Edelbrock Performer RPM will add 30-40 hp to the motor, along with the same increases in torque. The standard low-rise Performer is little more than a lightweight stock manifold, meant to provide good driveability from idle to 4000 (back and forth to Bingo) and remove weight from the front of the vehicle.
A rule of thumb is, the jets and the rods change about equally, that is, a size bigger jets is the same as a size smaller rods. Of course, you have to consider the fact that the jets are stepped, so you can tailor the different speed ranges with different steps. The big part is cruise, the smaller tip is power. Changing the springs changes where the steps come into action.