i have a 383 stroker and i am wondering if two 650 four barell holley carbs on a tunnel ram is to much gas for my small block and also i want to know if there is a kit that can lower my CFM's ?
2007-03-11 18:45:18 · 9 answers · asked by tatiana408 1 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
You should be okay if the carbs have vacuum secondaries. You can adjust the time when the secondaries open by changing the springs in the secondary diaphragms (Holley has a kit for this). Trial and error will help you dial them in.
Just running on the primary barrels should be fine if the carbs are jetted properly. Your best bet would be to take it to a shop with a rear-wheel dyno and fine-tune the jetting, timing, and secondary springs to work best with your combination. It would be well worth the cost of the dyno time to get everything working as well as possible.
2007-03-13 07:07:04 · answer #1 · answered by wrdsmth495 4 · 0⤊ 0⤋
In actuality, 1) while the tunnel ram would look cool, it will cause severe drivability problems on the street.
2) An engine is an air pump and will only flow so much air. A 383 engine at a reasonable 6,000 rpm with a volumetric efficiency of around 80% would flow around 680 - 700 cfm (without doing the math).
3) The only way to lower cfm requirements is to get a smaller air pump, or engine.
4) You are almost always better off with a single carbureator as it is beyond the average joe to get multiple carbs to work properly, not to mention is you aren't getting enough flow with a single carb, get a bigger carb.
2007-03-14 03:33:54 · answer #2 · answered by Curious 4 · 0⤊ 0⤋
Around town this would a troublesome carb. manifold setup. Tunnel rams are for high rpm circle track or drag racing. In other words for the 6,000 - 9000 rpm range while using big port high flow cylinder heads. The 383 was engineered and developed for low rpm torque and power. Every factory 383 in the 2007 GM performance parts catalog does not exceed 6,000 rpm. the highest horsepower motor runs with a 770 cfm. Holley. That's more than plenty for a street motor.
2007-03-12 13:44:38 · answer #3 · answered by Country Boy 7 · 0⤊ 0⤋
Why would you put duel 4s on an engine, then want to lower the flow?? Just use one 4-barrel about 750 cfm. You can get smaller jets for the carbs if you must. You must just want the looks without any power to back it up. Or something. I don't like Holleys but some do. Baddest setup I have seen was 2 Quadrajets on a big block Chevelle. Easy cruising but gobs of power when you kick it down. They said it wrinkles asphalt and sucks birds out of the sky! Quadrajets are great carbs if you know how to make them perform better.
2007-03-12 10:37:08 · answer #4 · answered by Anonymous · 0⤊ 0⤋
What kind of heads do you have. My dad has a 383 stroker with 202 heads and is running a demon 750cfm and it flows plenty of gas. If you want less CFM then get a smaller carb or put a restrictor plate in but that defeats the purpose of the carb. Why are you running two carbs anyways?
2007-03-11 20:21:54 · answer #5 · answered by the Animal 3 · 0⤊ 0⤋
That question depends on a bunch of stuff, compression ratio, cam lift and duration , head size and runners, exhaust size. I have ran that combo but it is set up for the engine to pull 4500 rpm and above, kinda sluggish around town unless you have very very low gears in the rear end, I have made good power with two 650's, there are better combos for power. I have ran two 485 CFM carbs and had great luck, very drivable did not want to load up while idling in traffic.
2007-03-11 23:35:04 · answer #6 · answered by TopFuel 3 · 0⤊ 0⤋
HA HA! Connecting rods do no longer replace something yet how some distance remote from the crank the piston is (and rod ratio, yet it is a desighn interest, no longer ay dynamic replace). i have in no way messed with a 327 yet i visit wager that the rods are likely resembling a 350, or longer. various more suitable positive aspects than Edlebrock available to boot. do a touch living house artwork. ensure you've a forged rotating assembly (you are able to spin the motor beond the skills of forged aspects), get some reliable heads, and a medium-severe period cam. Flat genuine pistons could do effective.
2016-12-01 21:02:04 · answer #7 · answered by luci 4 · 0⤊ 0⤋
depending on how you engine is built such as what cc and valve size heads? What is the compression ratio? What is you cam profiles? There are alot of varibles to consider, if you are running a street driven depending on the above 650's are too big.
2007-03-15 15:01:43 · answer #8 · answered by franklinbud8 3 · 0⤊ 0⤋
Put a supercharger on it and enjoy!
2007-03-12 13:11:11 · answer #9 · answered by Trump 2020 7 · 0⤊ 0⤋