Carburators

Add a Comment

Comment by Impala Builder on July 16, 2009 at 7:53pm

I have heard that the 327 and 350 have the same size bore diam. but don't remember where it came from.

Comment by Spike on July 16, 2009 at 3:41pm

operating temp is better. I 'think' the last year 327 has the large journal main bearings. That would be eitheer '66 or '67. As fas as looking for id marks, you would need to go to a group like nastyz28.com or (.org) I don't remember. i'll have to investigate. Those guys have a great database from which to draw information. I'm sure they can tell you where & what numbers are for a 327.
Something that can throw you is that a 327 & a 350 have the same bore diameter. I always liked the 327 it's a great engine.

Comment by Impala Builder on July 16, 2009 at 11:17am

Question? Must the engine be warmed up pryor to testing? The carb lacks a choke. What year 327 do you think we have here Spike? How can i tell if it even is a 327 block? ( just curious, i will not change it even if it comes out a 265 :-)

Comment by Spike on July 15, 2009 at 9:16pm

That must be a late 327 block. The early blocks had 'small journal' main & rod sizes. I have two 283 engines & one 327. all small journals. So you have 350+ ci.
Going back, Run the engine until it quits, remove the fuel lines and if mechanical pump, spin the engine (w/o coil wire) and see if you get a good stream of gas. Something else, after the engine quits, lift the aircleaner and pump the throttle, (engine NOT running) while looking at the squirter to see if gas shoots or not. As i mentioned earlier, after the engine quits, open the cap slowly, listening for a hiss. let me know what you find.

Comment by Impala Builder on July 15, 2009 at 7:43pm

Spike... YOURE THE BEST! WOW those toys do sound fast and fun ( furious) LOl. NO im into everything that moves slow and fast, sideways. gotta love them blue ovals! hmmmm? to be honest, i really do not know the answer to any of those questions. I did though remove the fuel lines from the carb and found NO FUEL FILTERS! Im not sure if the holley even requires one. ( BLOCK is 327,350 crank,the cam and rockers are comp cams, pistons keith black,edelbrock rpm intake, compression [UNKNOWN], CARB is holley 750 cfm double pumper,thats pretty much all info i have spike. Sorry if my info doesn't help, if im not clear let me know GOOD BUDDY.. GRACIAS!

Comment by Spike on July 15, 2009 at 3:53pm

A locking cap can be either vented or not, it depends. Your car normally has a 'vented' not closed fuel system (pre smog). 'Lowridin' Avenger' that has a 'ring' to it. Actually a vacuum secondary Holley 600-750 cfm would be the best for 'street' use.
A stroker! 383ci ? what ratio rockers ? How much dome on the pistons ?
what compression ? What are the 'specs' on the cam, duration & lift ?
It all sounds like a fun running car.
When I first ran my dragster, I had a 750 Edelbrock AFB,Weiand 'Team G' intake, Dbl hump heads 64cc,
a 510"-533" lift hyd cam, PG and 4.33 gears. It ran 127+ mph 1/4 mile So the vacuum carbs will work. hyd cams are fun too.
The Edelbrock 4 bbls are all good carbs. They are a redesign of the original Carter AFB (Aluminum Four Barrel). The Holley street Avenger is a good 670 cfm carburetor.
I'm going to build a Ford 302 for my 53 F100. It will have a mild cam, about 440lift & 218* duration approximately. A Edelbrock 600, Edelbrock Perf RPM, Headers, & an AOD trans from a 81 Lincoln. It has a 9" rear with 3.25 gears already. I realize that has no interest to you, but I wanted to let you know that i use these. A 850 cfm DBL pump is great on the track but not great on the street, unless,you have a big Big Block.
I went far afield, if it makes no sense ,, let me know.

Comment by Impala Builder on July 15, 2009 at 10:10am

Spike. Thanks for all the information. ( i dont think i have a vented gas cap, it has a key lock, carb vents? float levels correct?? acceleator pumps??? NO CHOKE AT ALL I will be checking all these arears. Well to tell you the truth, i dont know why im using the holley double pumper.? A small shop rebuilt the original motor and added these small goodies.. the car is a stroker, mild cam, camel hump heads with roller rockers, pop up pistons, hei, ummm? I hope thiss helps at all.? i am thinking of the "lowrider avenger, or edelbrock off road truck avenger"? what do you think? better or worse? THANKS AGAIN SPIKE AND THE GOOD BUDDIES AT CARBS GROUP!!!!

Comment by Spike on July 14, 2009 at 1:22pm

Black smoke = over rich mixture. BTW, If you 'hop' the car, why do you have a dbl pump carb ? I'm thinking a 600 vacuum secondary (the old Carter AFB ran from about 580 - 750 cfm and made plenty of power) may be better for your car. Do you have a 'vented' gas cap? After running until it quits, remove the cap in a quiet area and listen for a hiss. If it 'hisses' the cap isn't vented (or the tank vent is plugged or missing) Part of the problem could be the wrong gas cap. Are the carb vents clear? Are the float levels correct? Are the accelerator pumps OK or blown due to a backfire? Is the choke completely open ? I'm not trying to be funny, sometimes the strangest things happen. How about the point gap in your distributor, correct gap? Is the vacuum advance diaphram operating? Points OK? Cap not cracked?
How about unhooking the fuel line from the carb & (after removing the coil wire) attach a hose to a bucket & check how long it takes to fill a gallon. I guess you could try running it until it quits. Then quickly look at the float level sight glasses, &remove the fuel line from the carb, (remember coil wire), crank engine if mech. pump or flip switch on elec. pump and see if you get a good steady stream of gas coming out. It's very difficult diagnosing from a "zillion" miles away, but I hope these questions give you a start on checking things out. It's very frustrating when things won't go right, but I find that backing away & waiting & thinking will help. Good luck

Comment by Impala Builder on July 14, 2009 at 10:56am

Hey guys First of all. HELLO EVERYONE! thanks for getting a group for carbs, boy do i need some help with my 750cfm holley double pumper. ( My car is a 1964 chevy impala ss with hydraulics, so i try and hop it) the problems i run into are simple. the car runs for like 5 min. then it starts to feel like it has run out of gas, bogs down, backfires, black smoke comes out the exhaust, then turns off. ( painfull to watch!) i turn the key, the engine starts then the process starts again.... I have installed a new fuel tank, sending unit,fuel pump, lines, fuel filter, cleaned the carb. Urrggg!! Any help??

Comment by Spike on May 19, 2009 at 3:34pm

Just for kicks, you might try a much hotter heat range spark plug. If it takes awhile to foul a regular plug that might help. if it fouls quickl, you might as well put it out of it's misery. I suppose you could undo two plug wires (opposite on the firing order0 & turn it into a 6. I had a friend that turned a 6 into a 4 because of a bad cylinder. he removed the pushrods & propped open the valves to allow the gasses to flow right out & ease the compression on two cyls. I'm stuck on any real reliable methods.

• First
• Previous
• Next
• Last