My set up works pretty good, I went with 2 holley 390 2-barrels and she runs great, had to change the throttle cam and jet it down a little,JOKER JASON.
Great book huh! Mancini never got the mixture fattened enough to cover the 3500 rpm hole on that car and it wasn't until they were developing the next car they discovered the over scavenging the headers were causing. They just learned to drive around the problem, which was very tricky on the hard skinny tires they had to work with in '59 and '60, so they burned through a lot of clutches to make it work.
Hey T-Roy.. That does look like the M/T version. Can't tell but it looks like it has the center joining plenum between the carbs and I think M/T was the only one that had that..but don't hold me to it. Nice piece indeed! Poncho
Seems to me the Ramchargers and other Chrysler drag races did pretty good for themselves between 1960 and 1964...
Yeah, the book is a must read for anyone into early drag racing history. Even if you do not like Mopars, the personal stories of how they overcame the things like rock hard tires and lack of support is really inspiring. And, to keep it on topic, it gives the specific math equations on how to set up a "tuned" tunnel for what RPM range you want too. So if you buy a, say, STR 12, you can reverse engineer the runner length to figure out what RPM range it will be best for your engine... JK JK
Thanks! I think is the single coolest piece I've ever owned. Actually, this and the vertex mag that's sitting in the background. It does have the joining plenum between the carbs. Just odd it doesn't have any markings on it. And the "rough" casting is consistent. Doesn't look like anything has been removed, ie: milled off. ...I just looked at the pic again and the picture kinda looks like something may have been removed off the intake in front of the forward carburetor. Just enough room for M/T I suppose. Whatever make it may be, I like it!
I believe M/T is the only one that made a staggered one piece sbc crossram. It looks petty old and dirty. Try cleaning it and seeing if you can find any signs of it being polished once upon a time. The crossram on my Henry J is a weiand, but I was only able to identify it as that off of very subtle clues because it was polished and the name was ground off.
I'm jumping in. Combo: 283 +.30 forged flat top's, 58cc stock head's Edelbrock X-C8 intake. 350 turbo 3.08 rear gear. Cam? Short duration and mid .450 lift's? And I know from reading these thread's the carb's need to be small, 390's? Thank-you.
I just purchased a car with an Edelbrock C-8 crossram and dual Edelbrock carbs. The cam is a pretty radical roller cam on a 427 Dart engine. Tranny is a clutch turbo 400 hooked to 4.11 gears. I was wondering what mods you did to your carbs? The previous owner said he rejetted the carbs and changed the metering rods as it was running lean. When I drive the car, it seems like it's loading up even when it's warm. Haven't had a chance to learn about the car yet but will look more into it. Maybe the cam's too radical and the fuel is pooling in the plenum - not enough vacuum? Thanks!
I'd assume it'll be similar to a tunnel ram, of course there isnt a crossover to equalize the sides, and the runners are a lot more horizontal
good thread... Ive got an Edelbrock X-C8 and two Holley 450's for my roadster im building. Im running on a 350 w/ a 30-30 solid lift cam and a 3:70 gear in the rear. Im hoping this set up will work out well on the street for me... I've heard some horror stories on getting those 450's set up . But have had pretty good luck in the past with multi carb set ups. I've had several 3 deuce set ups on past rides . This is my first try with a cross ram.
I run a str-12 on my 340 in the demon other than having a high idle [900rpms] theres no real problems once you set it up right. The only complaint is for a kid working a part time job putting gas in her for a week is like a half a pay check, oh well.
I run a M/T Crossram and a pair of Holley 600 mechanical secondaries, dual line, double pumpers on a 377 sbc in my 57. With 4.88 gears and the 4-speed it runs 12.60's. With 3.36 gears for highway drivin', it gets 12-13 mpg. I can idle around town without load up problems. It is very streetable and I drive my car alot. I read and heard all of the horror stories about these intakes, but had to try it for myself and I'm glad I did. Plus I enjoy raising my hood now too!
------------------- It depends which 413 cross-ram set-up you're talking about. The 'passenger car' "long ram' set-up was tuned to make peak hp around 3500-4000 rpm or so, and peak torque around 2500-2800 rpm. But the factory "short ram" manifold - as used on the 413 and 426 "Max-Wedge" (Dodge) and "Stage I, II and III" (Plymouth) cars - was an entirely different animal. That one was a one piece manifold, with the carbs placed within the "V" - (as opposed to placing the carbs entirely outside the "V" and up and over and nearly touching the inner fenderwells, as with the long ram set-up!) with a runner length tuned for peak hp around 6000-6500 rpm, with peak torque at about 5000 rpm.The short ram proved to be a killer drag racing set-up in Stock and Super Stock in the early '60's. And the basic "short ram" design was duplicated virtually unchanged, except for port size and location, for use on the Super/Stock "Race Hemi" when it came out it mid-late 1964 - and it is still used in competition to this day. One thing that needs to be remembered about any ram manifold though. The ram effect is only effective through a relatively narrow rpm range. At peak power, intake pulses travel at the speed of sound and for a ram manifold to work, the runner length as well cam timing are optimized to give a mild supercharging effect by using natural resonance and timing of these supersonic pulses to cram more air into the cylinders than the engine could normally draw in on it's own - but it only works in a given and relatively narrow rpm band. Outside of the optimum rpm band that a particular 'ram manifold' is tuned for - at both higher and lower than optimum engine speeds - whatever extra is gained at the optimum rpm is taken away when running outside of that band. Offhand, I can't recall what it is now, but there is standard mathematical formula out there used for determining optimum runner length for a ram tuned manifold, based on engine speed. In addition, cam timing, crankshaft stroke, connecting rod length and runner area and plenum volume - all of which affect the timing, strength and speed of the intake pulses - also come into play when figuring ideal runner length, but as general 'rule of thumb', the shorter the runner length, the higher the rpm that the ram effect will start coming into play - and the longer the runner length, the lower the rpm that it will. Mart3406 ===================
Intake dimension formulas/calculators are at the bottom of this page: http://snow.prohosting.com/~johngift/intakefab.html
there is a few pics of mine its a m/t cross ram it works great on my car its a 327 and i run 2 450s on it i have never had any trouble out of it and i drive it ever chance i get
Bringing this thread back, yal mentioned small cams and small carbs? Would this cam be small enough, its a small solid roller. Moderate to fair idle, good midrange hp for bracket racing. 3000-6500 Rpm Range 118021 Part Number 234, 244 Deg. Duration @ .050" lift 296, 306 Adv. Duration 112* lobe seperation .022" valve lash hot .500 .500 gross valve lift
I'm FINALLY getting my motor togather, 350 block, 283 crank, 140 cam, offy crossram, 450 holley's with Big accelerator pumps, and Spaulding flamethrower. I'm gunna try going a little crazy with tuning, by putting some o2 bungs in my exhaust and trying to dial the vacumn in with every port possable Any advice?? Also it's going in a '64 el camino, backed by a m20 and somewhere around 4.11's to 3.73
Would love to see that camino running, just picked up a 71 that i gave to my dad, and i got a 72, and my dad has a 66.
Back from the dead thread!. I'll be running an XC-96 on my mine. its a 461ci. The unit is in great condition, handed down from my grandfather who passed away. Im looking for rec port heads and carbs at the moment. This thread is great so far good info from people who (Really) run X-rams. I hear alot of talk from people who have never run them, or even known anyone with one but tell me how "Horrible and hopeless" they are. Good to see people running and happy with um'
Hotroded, very sweet , I've never saw a M/T cross ram for SBF before . I picked up a set of 660's I may have a go on mine, been slow going since I been working on house a lot : /
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