i have a 390 holley on my 225 slant six.works goodI have a header and A Offy intake for my 71 Dart Slant six. Is a small 4 Barrel to much for a stock Slant ?
If that's the case wouldn't a vacuum secondary carb be even a better choice?IMO, the Holley is a mistake on small engines like the slant and even a 318.
The Holley is a square bore carburetor, meaning all the barrels are the same size. The slant will respond better with a carburetor that has smaller primaries, such as the smaller AFB style carburetors that Edelbrock makes. The 500 would be a good choice.
Some may say it's too big, but since it has small primaries, it will work well. They are more forgiving on smaller engines.
If that's the case wouldn't a vacuum secondary carb be even a better choice?
(225x4000)/3456 =260cfm
(225x4500)/3456 =293cfm
The point was what Dan said. The SuperSix 2bbl is almost more than what a stock slanty knows what to do with.
I have a header and A Offy intake for my 71 Dart Slant six. Is a small 4 Barrel to much for a stock Slant ?
YES, about 1.5 times,too much,going on three times too much.
Thanks guys I'll hold off awhile longer till I do my rebuild and install a cam and do some head workA thread here. Flow rating on a carter 2-bbl
According to science, the bumble bee can't fly. Its wing size and speed are not enough to get it off the ground.Ok try this
take your 225 and figure every revolution pulls in three cylinders worth of air right? So that would be 225/2 =112.5 cubic inches at 100% volumetric efficiency.But that poor stock slanty would be lucky to pull in 70%;so 112.5 x .7= about 80 cubic inches per revolution.
So lets rev it till it floats the valves, say 4200rpm. So now it is gonna pull in 80x4200= 336,000 cubic inches per minute. Ok so converting that to cubic feet is; 336,000/(12x12x12)=194 cfm
But let's say you put a big cam into it and ported the snot out of those miserable heads,And bumped the compression up, and headers etc, and you finally got the volumetric efficiency up to 85%.
Now you are up to 236 cfm@4200, or 281@5000,or 337@6000
Then bear in mind that the efficiency peak is usually at or near the torque peak,not at max rpm. So a slanty-cam that shifts at 6000, might power peak at 5200, and so torque-peak at 4000.
Now you are down to 225 cfm;imagine that!
I am very impressed that you can make a 500 perform.
Yeah, I know;lot's of guys have made it work. And I'm impressed by every single one of those/you guys.
According to science, the bumble bee can't fly.