need a half second
(Do) you think a converter would help? I checked a couple places, one dusterb318 suggs. acc was the cheapest. They recomended like 3200 for my set up. Rumble i have some stock vavle 360 heads. How much would they help? Others on the net have told me to stick with the heads i got and go with a 501 lift purpleshaft cam. That just seems like a lot of cam. I got a 750 eld. carb but one of the jets head is rounded off. I'm gonna try to use an easyout on it. how much would the airgap be worth as far as my et's?
Not trying to sound like a jerk, but........
You need to add in periods and such little things to aviod run on sentences.
A converter would certainy help. The idea of a higher stall converter is to allow the engine to launch the car in it's power band instead of slowly reaching it when you leave the line. A good converter will not feel like you have one or a mega high stall unit in there.
Spend the money on a good converter. Unless you plane to change things around alot, a cheap converter won't pay to purchase.
On a 318, I would prefur myself to use, in the following order;
Magnum heads
302 heads _ported with 1.88 (Max size) intake, 1.60 exhaust
360 small valve head. (1.88 )
If your looking for an exact amount, I can't say. (That also goes for the intake) However, the 2.02 is too large of a valve unless your 318 is a seriously pumped up engine. That valve was to big for the stock 340 back in the power making days.
The smaller valve keeps the air and fuel velocity high. This helps atomize the air and fuel well. A better and more complete burn is the result making more power. This works even better in a closed chambered head. Example; 302 or a Magnum head.
These 2 heads have a closed chamber and swirl tech. in them. This makes more power over a 360 head.
An open chamber head, like the 360 will make less power and require more advance in timing.
The idea of useing a big valve head and/or a 360 head is not allways the smart move. A stock 360 head doesn't actually move a whole lot of air. At low lift, it is actually terrible. (Stock head.) I think the 1.88 valve head will create more torque than a 2.02 head and help lower the ET. MPH should improve, but that iasn't allways the case. The idea is to be the first to cross the line. Most races are won/lost at the line. Equal light cutting by you and your comp.??? Then it's a race to be the first one to 100 MPH. Torque will do that well.
The heads work in conjuction with the camshaft. The Purple .501 @ 292 advertised duration is a big meaty cam I have personnaly used in a 360. The 360 was/is equiped with Edelbrocks heads and RPM air gap intake with a 750 Carter Comp series carb, Hooker super comps and a 4spd backing the engine with 4.10's out back.
While the car did move rather well for a street machine, it was a dead dog under 2600 rpm and didn't bother to wake up until 3000 RPM's. Now remember this is with not just a larger bore, but also with a seriously increased stroke over the 318. (More stroke equals more torque.)
The combo of big valve/poor flowing heads and said cam will make that think act like an overstuffed big belly filled pig. The gears (3.55) will not allow it to get into the powerband quickly.
Another thing about cams. I have no beef with the purple cams. But for the same money, you can do better and a more efficent power makeing cam.
Engines like a split duration cam. The idea is get out more exhaust for a cleaner intake charge. The exhaust port flows less than the intake. Even with a good balance, a little extra exhaust duration helps the intake charge stay cleaner.
(I am s fan of getting the most lift possible, but be sane about matters too.)
I think 750 is a bit large for a street ride. But it can be made to work. It's all in the tuning. For a street ride, I'd do a 650 at max on a teen. The smaller venturi's also help keep velocity up for better atomizing of the fuel.
All this talk of atomizing fuel. What does it all mean? How does it help?
Poor a 1/4 cup of gas into a cup. If you try to ignite the fuel with a spark, how does it go up. Boom! or just in a flame?
Make it a mist, like inside a ballon, and it'll go
BOOM!
Why? The flame can travle fast and get to all the combustable gas fumes. In a liquid state, the flame can not gobble up all the explosive fuel. Air runs out. Remember, in a cylinder chamber, air is limited, fuel is adjustable.
Thats my thought train and I'm sticking to it. :glasses5: