7045214, w/ complete kit from Cliff installed, recipe #2, WOT problem.

[429bbf]

some thing doesn't make sense.my engine is real similar . my gear ratio is 2.75 i know its to tall what rpm are you running at 75mph?im asking cause i want to change gears.im looking for about 3000 at 65. anyway back to the problem. I'm only running the over the counter napa  stock fuel pump i think it was 30.00 I'm thinking ether the float is to low or your needles are'nt  coming up.what size needles and jets do you have ?i believe i have 73 jets with 52 rods . id have to dig out my specs to be sure. fwiw

[429bbf]

forgot to mention  found a site that says a stock 429cj with/auto came with 72 jets and 50b rods hth

[429bbf]

just thought thought of something . i think thats about the year they changed primary rod length.fwiw

[spluhar]

My engine is not a CJ.  My carb is off of a 75 Chevy pick up.  I called Cliff and ordered a "kit".  He spec'd it out.  It came complete.  It included a larger needle/seat.  I'm going to try to add a little more float level, as it seems (after driving it for a while) to be running out of fuel often.

[spluhar]

my gear ratio is 2.75 i know its to tall what rpm are you running at 75mph?im asking cause i want to change gears.im looking for about 3000 at 65.

3300 is 80mpg (about).  I love the 3.25's.  That's with a 28" tall tire.
 http://www.wallaceracing.com/gear-speed.php
That is a gear ratio/mph calculator link.  Don't forget that you'll get some slippage through the auto trans.

[429bbf]

thanks thats what i needed . i need to slow mine down . i had it wound tight about 5500 last week and thats a little fast for my old car .mine does not run out of gas it pulls all the way.its setup almost the same as yours.  i don't like 75 or76 carbs.i only like 77 0r newer . the 75or6 had the apt in the left front corner standing in front.yes you can plug it but to me its not worth messing with.fwiw

[spluhar]

what do you have?

[429bbf]

i have a 17058212 and a 17059212 one on myltd 429 set up like yours and one on a 1979 ford f250 460  the ltd has the edelbrock intake i believe its the 7166 the pickup has the old cast iron manifold with a spacer . i will get rid of the spacer when i change intakes . i will not plug the exhaust crossover next time its causes me problem when its real cold and you let it sit for 15 minutes or so it cools off to fast. fwiw.

[spluhar]

What type of fuel pump do you have?

[429bbf]

it will take me a day or so to answer you. its below zero and covered in snow and i don't feel like digging it out . ha getting lazy in my older years. i think its an ac. i just went to napa and told them to give me a pump . nothing special just over the counter.ill try get back to you monday sometime.

[429bbf]

the napa part no. is m60036     he said its made by MPE 6.5-8 psi 30gph my cost 26.49 if you do a little searching i see carter has the same part no.m60036. hth

[351wpower]

Just for the Halibut. Have you tried running it with a fuel pressure tester hooked up. When  the power goes away does it just fall flat or are there any symptoms like stumbling, backfiring, ............ Your sure the secondary's are opening and the rest of your linkage is operating correctly. (I know the E-brock performer intake is basically an aluminum version of a stock cast iron intake designed for 2v to 4v carb swaps) and is great for engines that did not come with or is very hard to find a factory 4v intake for. Having said that they are not always plug & play. Things like the throttle cable and bracket might bolt up but depending on the carb used may not function correctly. Especially if the car was equipped with a 2v carb from the factory ( I know you said you were using an E-brock AFB but that also might be different enough to cause a linkage issue with the Q-jet)

Engine off, air cleaner off. Have someone press the pedal down to the floor and look at the carb now remove the throttle cable and by hand open it up does the carb linkage keep moving if so then your throttle cable is not opening the carb fully.

I'm guessing at this point you have already tried pulling the fuel line off (both ends) and blowing it out. Also if there are rubber lines like from the sending unit/tank to the steel like that runs down the frame (factory type connections) see if they are cracked, brittle............... There is always the chance it could be sucking air. Or if your running a lot of rubber hose it could also be collapsing somewhere or crimped enough that the problem only shows up under load higher RPM's.

BBF after market intakes are square bore are you using the special gold colored adapter from E-brock with gasket top and bottom. The adapter they say to use when running a Q-jet on any of there non GM. dual plane intakes.

Just some food for thought (These are the phrases used when you over 40')         

[351wpower]

I just thought of something else to try. Does it only do this under load or will it do it in park as well. if it does bypass the entire fuel delivery system by using a gas can (a marine gas tank works good) and a length of fuel line. Start it up and run it up over 4000 RPM What happens. Problem goes away focus on tank, lines.............. if problem is still there then your left with the carb.

As far as the Buick GS 455 they used a high capacity pump (long body) but for non GS 455's like a 455 in a 225 or wagon................  they used off the shell GM pumps. If you look at what came out of the factory back then early/mid 60's big blocks with 2x4's 3x2's cross rams...............they weren't running race pumps.   

[spluhar]

Have not used fuel pressure gauge while driving.  After 2 or 3 seconds of wot, it starts stumbling. 

Secondarys are opening fine, I can feel them as there's a point where the end of the primaries where the secondary linkage needs a bit more foot to swing them open. Linkage is adjusted properly, am using the bracket off of the 2bbl 400 and a custom 2 hole 2 piece spacer to adapt the carb.  I didn't want an open spacer due to the weaker vacuum signal, and a 4 hole was too shallow, with not a smooth transition from spread to square.  I haven't blown down the fuel lines yet, but I just put in a new pick up and sending unit, a few months before I switched carbs.

I would not attempt to bring my engine up to 4000 rpm w/ no load.  Too many things can go wrong.  I've personally had engine component problems (when I was young and stupid) from revving engine w/ no load (possibly broken piston or ring, no compression and severe oil blow-by), and was close by my buddy when his fan blade broke off while revving engine in the driveway.

[spluhar]

Update.  I hadn't run my car hard for a bit.  I've changed out the in-carb filter for the in-line filter that I had on previously.  I got on it the other day and it ran hard up to 5k w/ no hesitation. 

I had the opportunity to go on a longer trip last week.  67 mile round trip, 80 mph the whole way (3200 rpm), on 4 gallons of super.  16 mpg average w/ a big block, 4500lb brick, running pretty hard.

The article that convinced me to try the Quadrajet was in CarCraft 08/01.  I bought the carb in 07.  I bought the kit in 2010.  Now it's on and it works as planned!