396 2bl combo
 

Has anybody dabbled with a 1969 B body 396 2bl combo ?

Re: 396 2bl combo
 

Been done, don't work, better off with 2V 350.

Re: 396 2bl combo
 

Billy, how bad is the 283 2bbl as far as consistency? Any headwind issues with that low of power, lol?

Wade

Re: 396 2bl combo
 

I just tested my 2bbl combo this past weekend and Billy was right on . It was 1 second slower and 12 mph slower than the 4 bbl run the week before and lost20 in 60 ft (1/8 mile). I probably could tweak a little more ,but not worth it .... I have 2 - 2bbl carbs and intake if there are any brave souls who dare to try it.... If Billy says it is snowing in July ,you better get your snow plow out.......lol

Re: 396 2bl combo
 

wade, any time you get into "lower class" Stockers you get into wind issues. The less power you have to work with the worse you are in the wind. Ask some "slow" Stocker guys how much having the track prepped right in front of you slows you down!

Re: 396 2bl combo
 

40 years ago we stuck a stock 283 4 barrel on our P/S 283/185 4 speed 59 Biscayne and it was worth 1 second also

Re: 396 2bl combo
 

i have that 2bbl 396 intake !

call if ya need one !

jack
502-558-3450

Re: 396 2bl combo
 

I also have intake - carb and even the air cleaner.

Re: 396 2bl combo
 

Billy, I've always convinced myself that one reason the wind is a bigger problem with slow cars is due to being on the track for a longer period of time.
I tried a 2 bl on a 220Hp stick car back in the day and it was 1.05 slower. I changed it over at the racetrack and changed it back after one run.

Jimmy

Re: 396 2bl combo
 

In 1972, I was testing our 61 Chevy, 2 bbl, PG, SS/X car at Ct Dragway.
It was running around the new minimum (14.80's ) I stuck on the WCFB from Joe S's 61 Vette, and picked up about a second . No one on hand ,including several S/S racers, even noticed!
Goes to show , some think all slow combos are bogus!

Re: 396 2bl combo
 

Of course on a 2bbl it is easier to activate the tilting mechanism with the throttle linkage. Don't forget to adjust the fuel mixture for WOT, not pit cruising!

Re: 396 2bl combo
 

Mark, did you happen to try the old flat washer trick between the 2 bbl and the intake. Bet Jimmy Parker can relate to those days....Not meaning he did it, but that he saw it.....Frank

Re: 396 2bl combo
 

I have the intake, carb, air cleaner and heads if anyone is interested.

Re: 396 2bl combo
 

No, not on that one, seeing it was a PG car.

I DO know ,you can remove three little parts from a 4GC carb and pick it up over a tenth..
or so I'm told. LOL

Re: 396 2bl combo
 

Hell Jack, I've got the crank out of one. Was never bored for a pilot bushing. Its also 5lbs lighter than any other 396/427 crank we have. Unfortunately it died an untimely death at the hands of a spun rod bearing

Re: 396 2bl combo
 

Seems to me the bottom half( short block,cam, pistons, etc.) on that engine were the same as the 325 horse. the heads were one-off, about equivalent to a 71 402 head,but with a different part number, but that crank you mentioned is a cast crank. Almost all the 68-9-70-71 396/402 standard production units were cast. ('<').

Re: 396 2bl combo
 

yes it is a cast crank. Dad got the whole motor out of a wagon wayyyy back when. Only one we have ever seen not drilled for a pilot bushing, or that light. It was a different piece for sure

Re: 396 2bl combo
 

I don't know if this is an urban legend, about 20 years ago a guy told me to find a 335 hp. 427 crank same stroke as a 396 (cast). I believe it was 69 only no pilot bushing and was lighter than 325 396, cannot find the casting no. gsa612

Re: 396 2bl combo
 

that's the crank but it was a 2bbl 396 out of a wagon (not 100% sure on the hp), may have been the same in a 427/335

Re: 396 2bl combo
 

69 Full size and wagons only @ 265/265. Do not see it in any other year in my books

Re: 396 2bl combo
 

thats it. that's what the motor came out of.

Re: 396 2bl combo
 

well, I hate to say it but I built that combo way back when stock rules meant stock. factory pistons ,presses pins ,stock lift, duration, and overlap stock valves,rods, I did use the cast crank,racing head service did the valve job but the valves were backcut when they showed up so I had to re cc the combution chambers. a RPM 7000 series cam dynamics cam with stock lifters ,valve springs were very low pressure 96lbs on seat 225 over the nose,stock trans was a t-400 no gear set then or aluminum was available then,and I used a Rossi 9" cortina convertor 4800 stall. @4705 racing wt. for Q/SA 14.35 index we went 14.17@84 mph 2 time out, the gear was wrong we started with a 5:57 but the engine needed more like a 586 or 614 it only finished @ 4600 but we shifted @6000 and it pulled good you have to mechanically overcome the over 2 tons of wt. The car was fun it would pull the wheels 3ft and once I raced jerry mcClanahans Q/SA which was running 13.80's at the time and thru first and 2nd gears our wagon went off and hid from jerrys car but plug high gear and he would drive around me. It was early in my racin career so I was pretty green and still learning but my partner didnt want to keep racing so the project was cut short of its full potential.I pulled the engine & trans and sold the car to tony Janes with posi and 557's still in it, It was a 1969 brookwood 6 passenger body. .....memories???..JUST MY2 CENTS

Re: 396 2bl combo
 

by the way the cool part about this whole deal was, we found the wagon at a upholstery shop in the back it was original 2 bbl 396 car no motor or trans but the owner still had the intake and carb (435)cfm 2bbl , we bought it for $75 cleaned the interior put a seat cover on the front seat and painted it refrigerator white like GRUMPY my idol at the time. THE GOOD OLD DAYS Hmmmmmmm JUST MY 2 CENTS

Re: 396 2bl combo
 

That was the only year that motor came in and only in full size body and wagon. I had a wagon with motor, 400 turbo and 12 bolt rear.

Re: 396 2bl combo
 

yes , that motor only came in full size Impalas etc. it was a salemans special fleet deal chevy came up with for the cigarette companys,before I sold the wagon I put my 425 hp 427 with nitrous and made about $1200 street racing it , out in Ontario Calif's wine vineyards area.

Re: 396 2bl combo
 

was that a rochester carb??

Re: 396 2bl combo
 

yes, a Rochester #37029117,118,119,120,. head casting 3933148 109.14cc chamber, intake casting3952300,everything spec wise in the short block is straight up 325 hp 396 ... JUST MY 2 CENTS.

Re: 396 2bl combo
 

I was thinking about trying that in my car to run Q but to many other faster cars

Re: 396 2bl combo
 

Bob, why bother? 396 uses 1.250 Venturi carb, 350 uses 1.375 carb.

Re: 396 2bl combo
 

what is the maximum cfm possible from Rochester 2bl 1.25 venturi??

Re: 396 2bl combo
 

I believe the rating to be 352CFM.
Billy (visiting The Don)

Re: 396 2bl combo
 

well I stand corrected per a circle track article on a 2gc carb the 435 cfm version is the one Billy Nees refered to the 1 3/8 venturi carb, the 1 1/4 venturi carb I ran was rated at 390 cfm per the article in circle track, SMI wrote the atricle and said these carbs were actually flowed , and flowed more than there rating.the 435 version is rated at 500 cfm and circle track racers use it alot , the 390 version is used in rules limited situations it flowed 435 with alittle modifications to the boosters all legal in Stock Elim.....Just my 2 cents

Re: 396 2bl combo
 

Is messing with the boosters legal?
Is that considered a jetting change?

Re: 396 2bl combo
 

Shouldn't be, but 2bl guys around here were doing that in the '70s. Seemed to go through tech OK. Pretty dramatic improvement in air flow and track times. I couldn't believe they were getting away with it.

Re: 396 2bl combo
 

...400 ft lbs of tourque in a 4000 lb R/Stock wagon??...it might work...

Re: 396 2bl combo
 

Seems like I remember from the old days that a 2 Brl.Brl. Flow Bench was at a higher level of vac. than a 4 Brl. Does anyone remember the difference? Would 400 CFM on 2 Brl. bench be about 300 CFM on a 4 Brl Bence setting?

Re: 396 2bl combo
 

Industry standards 2 bbl ratings are at 3.0" Hg, 4 bbl ratings are at 1.5" Hg

Re: 396 2bl combo
 

Wasn't Bob's wagon the 396-2V combo when Frank Tantillo owned the car years ago ??
Joe Huestis L/SA 9724

Re: 396 2bl combo
 

No . Ray Litty built the car in the 70's with a 350/250 2 bbl PG and a tune up from W A Lee.
Frank bought the car from a guy in So. Windsor, Ct. I'm pretty sure he then put the 4 bbl on it in the late 80's. Might have gotten it from Eddie Bednaz, although I know I worked on the carb too.

Re: 396 2bl combo
 

are under carburated motors sensitive to header primary tube size and collector size/length?