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Are the EGR valve and manifold port(s) clean? Is the EGR valve getting vacuum from the carburetor? EGR tends to get crudded up with carbon preventing proper opening. Best thing I've found for baked on carbon is CLP Break-Free. Works wonders on firearms, too.

FWIW: Some International truck engines used the TQ as an OEM part. The biggest problem I've seen with used TQs has been caused by someone getting ham-handed inside the carb and stripping out stuff which renders the main body unusable. Next in line is getting one adjusted so the secondaries...

All of the squarebore 4bbls and quadrajets will interchange as far as fitting on the carb throat. I do not have a thermoquad to check to see if it has a 5 1/8" throat, too. Need to watch for clearance on throttle linkage & various vacuum attachments engine may need, especially if working with a...

Are you asking about air filter elements or air cleaner housing?

ROTFLMAO I'd rather adjust the knobs til its warmed up properly, then check the oil. On a more serious note: Because the OP asked about mixture questions, literal person I tend to be, restricted my answer to that issue. For the threads (especially on plug 2) to be as discolored as they...

^ X2 Melted electrode of top plug suggests a little lean. IMO, 1, 2, 7, 8 plugs are more likely to be lean due to longer intake runner length. Very good, especially for first trial.

Big difference, IIRC, is that the marine carb is vented internally, rather than externally as with an automotive carb. The tell is a hooked tube coming from the body of the carb and opening towards the throttle bores.

I'll add my 2¢ worth here. IMO, the Eddy/Carter is better out of the box, but if you are able to tune it, the Holley will produce more power. RE: Holley off friend's car. Though the temptation is to say that 323 isn't very far from 327 CID, it would be misleading to say that CID is all...

RRR, Not bad call on the CR. Nominally, Ford called it an 8.0:1 CR. The 351C-2V and the 351M used very similar small passage heads. The situation on this motor sounds a lot like the 318. It is easy to over-cam and over-carb. Since the M motors are so similar to each other and to the...

Had to go back and look closely at the gasket. I see what looks like a spreadbore foot print mounted backwards. If so, I'm sure they were disappointed with the performance as I doubt the secondaries would open very far. FUBAR

They churned out a bunch of 340-4v in the 1970 MY. The choke pocket was always on the passenger side to keep it from getting tangled up with the throttle and kickdown linkages. The MY 1970 340 used the AVS carb. I think the secondary holes on this manifold look a little larger than the...

IIRC the old 318 cop motors had Quadrajets and not Thermoquads on them. Similar layout, small primaries and large secondaries. Both had air valve secondaries which meant that they opened only when the right foot wanted it and the engine could accommodate more fuel. Don't know about the...

IMHO, more development effort has been lavished on single four barrel manifolds than on any other carburetor configuration. That being the case, small wonder that they perform well versus the 3x2 that are virtually unchanged since 1970. I'd be interested in seeing a 3x2 vs 1X4 vs 2X4 dyno...

I agree, but look at the 9th photo down. SmartKen: To answer your original question, IMO, the engine is over-carbureted for street use. Besides better mpg, the smaller carb will give improved throttle response at lower rpm. For race use, the 770 is still a bit much for the 340 assuming...

About 15 -20 lbs lighter. 340 4 bbl manifold matches big port heads.

X2 For small port heads. A new one is $244.97 + ride from Summit.

I can't believe you asked for this, PoisonDart74. To retard the timing on the LA V-8, loosen the screw at the base of the distributor and rotate the distributor in a counter clockwise direction. On a more serious note, the Clean Air Package tune-up specs set the timing at 5º ATDC in contrast...

If your engine is well worn, you can get away with 89 octane with something like stock tuning. If your engine is well worn and you want to run the cheap stuff, retard the timing. If your engine is developing full compression, suggest the 92 octane. Leaded gas for all practical purposes...

Use Toluene with care. It is the ingredient in plastic cement that renders the result sniffers are seeking. A gallon of that stuff could injure a lot of kids or do a lot of good by thinning out the shallow end of the gene pool.

IIRC, one of the car magazine back in the day did an experiment and found that running a base plate that eased the transition of air into the throat of the carburetor provided better air flow than running nothing. If you are really serious in maximum air flow and can find room for it, a...

The gas tank is not very large, so the technique I used for cleaning out a motorcycle gas tank may work. Empty gas tank and remove from car. Remove sending unit from tank. Put one or two pounds of small (grape size), rough gravel in the tank and seal the openings. Shake tank vigorously for...

Need to know engine, too.

Looks a lot like a Holley 4165.

X2 Back in the day, these tanks were notoriously difficult to fill because of the shape of the tank and the position of the filler. The optimum position of the car to fill is with the nose up and the body tilted away from the filler. The idea is to make the fuel filler the high point of the...

Actually, you should be congratulated for knowing you were in over your head and asking questions here on FABO rather than take the knucklehead approach of drilling holes in an otherwise good hood and wondering later if some expense and frustration could have been avoided. Smart approach, young...

Recommend the stock manifold. The Performer is designed for the small port heads. The Performer RPM is for the large port heads. If you're not going to restore the original emission control system, recommend replacing the floor jets in the stock manifold with plugs. Also recommend removing...

Yes, the Performer is built for the small port LA heads. Suggest the Performer RPM. It is made for the larger 340/360 intake ports. It is a little bit taller, but should not be a problem for the Ramcharger. According to the literature, the Performer works from idle to 5500 rpm, the Performer...

I'm running a 625 cfm AFB & a Performer on a 318 with 302 heads in the Demon. Throttle response is good, haven't done any fuel mileage determination yet.

Don't see any reason why not, except the SuperStock heads. The manifolds were turned out for both the B & RB motors. The big differences are going to be the length of the balance tube and the length of the rod linkages from the bell crank to the carburetors. This is due to the difference in...

The DGV is a good carb. It is a progressive 2 bbl and popular with the /6, crowd among others. The carburetor is still sold and there is aftermarket support for it. My experience with SUs exercised my repertoire of epithets. When properly sync'ed they worked fine. If you're looking for a...