the '53 is getting to a road worthy point...headers are on the way along with intake heat plate. front clip is back on now i'm just left with the gas tank and window seals and it will be driveable, not finished, but driveable. but anyways, i've had a couple old school mechanics (Tom Landon being one of them) tell me that i need to up my carb. right now its just the stock monojet from the 292...works great. i'm just afraid that with the little bit of a cam that i've got that the monojet will "hurt" the engine as far as performance and realiabilty. i'm NOT looking for crazy HP....just good cruising speeds and decent MPG. my mechanic and Mr. Langdon botht swear that with the 292 and the "upped cam" i should be looking at a 4 bbl. or at least a 2x2 set-up. Langdon told me that my stock monojet is about 230cfm and that my 292 needs about 400cfm. he suggested a Holley 390 4bbl. i've never been a big fan of 4bbl's on L6's...only cause i think it looks funny to have a "big 'ol carb" sitting next to the 6. but i truthfully at this point could care less about "looks". i'm kind of on a budget (as most of us are) so here are my options: A - Keep my single Monojet for now and hope it does ok. B - look into a 2x1 intake and pick up another monojet to run 2 monojets C - pick up a 4bbl intake and the "cheapest 4bbl" i can find i would like some suggestions. thanks. Chris
I listened to Tom's advice on my 292 build. I used a 2 x 4 manifold (water heated) and adapted it down to 2 Holley-Weber 2 bbl's. They are progressisve, so each carb runs on a single bbl most of the time, and the second kicks in like the secondaries on a 4 bbl.
I would second the 2x2 using the H/W 2 barrels. I think in the long run it is probalby going to be cheaper than finding 2 good one barrels.
The cheapest and easiest route would be to use a single 4bbl intake and an old 4GC Rochester from a 283. Only problem is, as you say, single carb setups ain't pretty... Second choice would be a 2x4 Clifford intake and a pair of H-W carbs as suggested.
Single 4 manifold with a quadrajet like the OHC Pontiac 6 ran would be my choice. With vacuum secondaries it wouldnt bog but use only the air it needed
Hey cwatson1953 forget the single 4b and just do this LOL it has more of a WOW factor hehe But like the other guys said go the 2b route.
JESUS....yea, uhhh, no...i actually want to engine to run nice...not drown in fuel. haha! since money and time are an issue right now...i think its gonna have to be a single 4bbl for now. as for the clifford 2x4 set-up.... an offy 1x4 intake is a bit cheaper than, well, anything clifford sells and right now, i've got less than a month to get the car road worthy so i can put some in town miles on it before i try and drive it to roundup...let alone VLV.
I bought a Clifford intake on ebay for about $70 and a new Holley 390 for another $160. I get better mileage than I did with the monojet on my 292.
An Offenhauser 4bbl intake will give you better low end throttle response than the Clifford, but either one will work. The reason I suggested the Rochester 4GC is that they are a square bore, so they fit better on the aftermarket intakes, and they are cheap and easy to find at swapmeets. Remember, the Clifford intake requires an adapter plate for whatever carb you use.
yea, thanks for the advice. i actually order an Offy intake from Langdon, now i'm just trying to decide on what Carb. i may look into the Rochester 4GCs... thanks
4GC's are a lot less h***le then a quadrajet for sure, 390 Holley would be good too.Multiple carbs look cool but are a pain the as*
Hey <TABLE cellSpacing=1 cellPadding=4 border=0><TBODY><TR><TD cl***=thead>cwatson1953</TD></TR></TBODY></TABLE> Not to worry That motor doesn't drowned by no means. for that matter at the end of a 1/4 run the plugs still look as if they just came out of the Box. But yes the offey will be your best bet for a daily driver. Like snarl said the offey give better low end to mid range power. The Clifford was designed for Mid range to Top end Or High rpms. I have ran both First the offey then a clifford dual 4 then i built my 3x4 tunnel ram intake which ran the best. and the main reason for this is the runners & carbs sat right over each port. That is way webbers is the best way to go If you can. Best they have the straightest air flow to the ports. Next best thing is Injection.
i am running a clifford 4 barrel intake and a holley 600 4bbl. also have a langdon mild cam. head has been slightly ported and bigger valves. runs very well and i dont even get into the secondaries
I'm guessing that you'd have to at least fab up some adapters, but I wonder if running a couple Rochester Vara-Jets might be the best of both worlds. They were a progressive 2bbl with a small primary for good low speed response and a larger air valve secondary. Think Q-jet split lengthwise. They were used on the early 151 Iron Duke motors and the 2.8L V6 so two of them might be enough carb for a warmed up 292. If not, rig up three of them! The only drawback might be that they were emission/mileage carbs and it might be tough to find much in the way of jets or metering rods.
what would you recomend as far as cfm? i've been looking at anywhere from 400 to 600....but was told i'd be better off keeping it no more than 500. any suggestions? thanks for the advice. chris
I know a few guys that run the Edelbrock 500cfm On the 250s as well as the 292s (roundy round, drags, and Street) and they seem to like them. Personaly i like my holleys and I have ran them for years well since the mid 70s. so I guess you could say I can even rebuild them blindfolded so my buddys tell me anyway LOL. But anyway i think the 500 cfm Or a 450 would pretty much right in the middle and you should be able to tune it either way.With out much trouble. With The holleys You need to make sure you have the right power valve Other wise you may have trouble trying to tune it. (Jetting and what not). Each motor likes what it likes. I was told my 3x4 tunnel Ram intake May not even run let alone idle on my 250 because they felt the cam was maybe to small for it. (mind you I built the intake for The new motor I have built now) But anyway It turned Out to have Run the best over the offey and the clifford dual. And it is very drive able. Seeing that i do take the car not only to the drag strip I also take to car shows Were the car does get driven in and out & about the areas. I think the cam was more of a issue then the intake in my case Because it always wanted to lope and Each time it would lope it would bark the tires,Some liked that but other didn't OPPS sorry for their luck I liked it . PS and depending on the amount of head work you did the motor is going to want more carb /cfm anyway.
The Jalopy Journal
