Mandrel Bent Pipe
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71 elcamino 383 510-488-262duration cam 144 blower th400 msd ignition want to change gears currently 4.56?
Iam running about a 2000 stall pulls a little when you put it in gear want to go to a gearset that will pin you in the seat a little and get a little better gas mileage currently get about 4.5 if your easy on it. Set up with 6psi boost on 8.1-1 pistons small valve heads casting date 1970 supposed to from a camaro. Any clue on what kind of h.p. 750 edelbrock carb mandrel bent pipe,headers and flowmasters
Your 4.56's are running the engine out of breath on the top end.. That combo aint gonna make power in the higher RPMs where the 4.56's will put you crossing the traps.
You have a mild cam'ed, 383 stroker with a small blower... Your engine is making the torque.. No need to try to do it with gears.
Your best gears will probbly be 3.42's to tell you the truth.. I would need alittle more info to be 100% sure though.. Like your rear tire size, and all the specs on that 262* cam (adv. duration, duration at .050", lope sep angle)
The 4.56's you have now will "pin you in the seat" the hardest on launch than any other gear, but it's killing your top end (putting rpms past the rpm where your HP peaks at) and also killing your fuel mileage.
If it's not "pining you in the seat" now, then you have some slight probs in tuning. Or your just boiling the tires off, no traction, just spinning hard.
I would also go higher on the stall.. That combo sounds like it needs 400-800 rpm more stall.. So a 2400-2800 stall converter.
Hows your tuning?
I love the edebrock carbs. I been running them and carter AFB (same carb as edelbrock) for the past 8 years..
Out of the box they have a few probs that needs to be fix though..
If you noticed the engine trying to die during hard braking or cornering.. Or a bog when you hit the throttle..
It's the floats not adjusted right.. Out of the box most was set wrong.. You need to adjust them to 7/16" at rest, and 15/16" to 1" drop.
The pump arm linkage need to be in the top hole as well.
The other major thing with them is fuel pressure.. 5.5 psi is max the needles can handle.. Over that and the pressure bounces the needles off the seats and trys to flood carb some.. Use an adjustable fuel reg inline with supply line and set pressure to 5.0 to 5.5 psi (I run mine at 5.25)
In most performance engines the step up springs needs to be changed out too.. The 7" HG pink springs work good in alot of set ups...
You really need to get your vac level though to see what springs you need though.
Also carb jetting.. Hows yours running.. Rich, lean? Your spark plugs are the best thing to let you know.. Read your plugs and jet till plugs shows you are just right.
What spark plugs are you running? I belive 1970 chevy heads still used gasket seat, not taper seat plugs.... So you will need the spark plugs with the large 13/16" wrenching hex, not the 5/8" hex and a washer type gasket on the plugs.. If you run AC delco plugs the # with be R4-S... The blank spot is the heat range..
Most roots blown engines will need atleast 1 step colder plug.. So an R44S ac delco plug or maybe 2 steps colder R43S.
Whats your timing like? The boost will cause detonation quicker on pump fuel, so you may have to pull alittle timing out. Try 34* total to start with.
Also set your timing curve so full mech advance is fully in at 3,000 rpm
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