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more power to the slant 6?
https://slantsix.org/forum/viewtopic.php?t=24214		 Page 1 of 3
Author:  Blackdog455 [ Wed Jul 25, 2007 10:47 pm ]
Post subject:  more power to the slant 6?
Im just wondering here but whats a way i can get more HP out of my slant 6? Im going to be putting in the super 6 intake, and possably some dutra duals exhaust intake.

Anything else i could do for a gain in HP?

Oh and whats the stock 225 hp and if i were to put on the super six and dutra duals what would the hp be? thanks.
Author:  sick6 [ Thu Jul 26, 2007 5:52 am ]
Post subject: 
stock HP on a 74 was really low, like 100 or something if I remember right, I think '75 was worse. I don't know exactly what your gains will be with a super six intake and duals......I haven't run them.....but you will notice the difference.

as for more power, its really going to depend on how much you want to spend.

a super six intake and dutra duals are a good start. once you get farther along you might want to go farther, but it really depends on how much you want to spend. a bigger but resonable cam can also be had (I think slantsixdan had a source for a good mid-range cam).

big gains can be found by headwork, but it gets very expensive depending on what you have done and how far you take it. I personally am running a holley 390 four barrel with a clifford intake and headers (need new ones) and alot of headwork and big cam. the headwork cost me $800, the cam (clifford) was $200.........it adds up quick.

decide on your budget and your needs and we can narrow it down more for you.
Author:  Blackdog455 [ Thu Jul 26, 2007 8:08 am ]
Post subject: 
alright thanks. I was looking at buying a used 318 but the gas milage isnt that good.

So since i probably cant get a 318 im sticking with the 225.

some ideas i had were to bore and stroke it. Would that help?

my price range is probably a max of $500 right now.
Author:  sick6 [ Thu Jul 26, 2007 11:02 am ]
Post subject: 
$500 will probably cover a super set up and duals.......maybe. you'll have to check ebay for the super set up unless someone is selling here in the for sale section. Doug Dutra is right here on this site from time to time.

a bore and stroke is a good idea when doing a total rebuild, but you will eat through $500 easy doing that. Stroking a 225 can be done with 198 rods, but you'll need new pistons, and most people just do it to increase compression. 198 rods are very hard to locate too. Just a bore would be good, and get the assembly balanced.

are you looking for a "mileage" build-up or more power for the six? If you gave up on the 318 because of mileage issues, I am not sure.

with my holley 390, intake and headers I got 25 mpg with no other mods. had a three speed and I believe 2.76 gears, but later I chucked the rear axle long ago in favor of a 8 3/4 with 3.23 sure grip (hope to get 3.55's someday). no special tuning, just basic maintenance.
Author:  Aggressive Ted [ Thu Jul 26, 2007 12:58 pm ]
Post subject:  Mileage?
What headers and manifold did you use?
and what was the mileage after you switched to the 3.5 rear end?
Author:  sick6 [ Thu Jul 26, 2007 1:02 pm ]
Post subject: 
the manifold and headers were both clifford (long old style headers).

the sure grip (3.23 in an 8.75 pumpkin) hasn't been on the road yet, I parked the car to do all the mods and bought the rear after that.

from what I have read 3.55 gears will be a better fit for it once I get it on the road.
Author:  Blackdog455 [ Thu Jul 26, 2007 3:21 pm ]
Post subject: 
oh i already have a carter 2 bbl carb and the new 2 bbl intake manifold. Im looking to spend $500 on new stuff right now.
Author:  SlantSixDan [ Thu Jul 26, 2007 9:08 pm ]
Post subject: 
Well, if you've got $500 burning a hole in your pocket, then by all means go out and spend it, but it seems to me you would probably wind up happier if you take a step back and plan out your goal for this round of upgrades in very specific detail. Focus on outcome (what you want the car to do), not input (what parts appeal to your fancy at this particular moment).
Author:  Blackdog455 [ Thu Jul 26, 2007 9:12 pm ]
Post subject: 
good idea. What appeals to me right now is a tranny and oil cooler, New air filter, headers and exhaust.

tranny and oil cooler can wait, and i dont even know if i need them. Ive always wanted a new air filter to give it that muscle car look under the hood and to get more air into the system. And headers or dutra duals i want for more hp, better sound and better performance....

so ya, i really havent made up my mind on what i want to get first.
Author:  DusterIdiot [ Thu Jul 26, 2007 9:56 pm ]
Post subject:  Uhhh Yeah...
I think getting your slant looked and make sure it's in good condition compression wise/etc... would be a good start (I've added parts to a 'road oiler' slant, and it does make lots of power and smoke too...).

Next if it's in good shape a tune up with good quality parts is next...

After that, upgrading your timing curve would help a bit (check board for details). If it's still got the stock carb on it, doing a rebuild and swapping the #58 jet for a #60 will give you back some power too...

Next for the $$$, just upgrading to a 2.25" exhaust pipe will give you a small boost in power and mileage...

Save money for the next two bumps in power (getting the head decked if bottom end of motor in good shape for more compression), and the super six....

Next for another wad of $$$, change rear gearing to 3.23's....


When you have a bigger wad of $$$, then you can pursue the 'dream parts pile'...

-D.Idiot
Author:  vynn3 [ Fri Jul 27, 2007 4:23 pm ]
Post subject: 
Quote:
Ive always wanted a new air filter to give it that muscle car look under the hood and to get more air into the system.
Yeah, more HOT air. It'll FEEL faster, and SOUND faster, but it won't BE faster.

You need COOLER air to the carb, not MORE air. But, hey, chrome air cleaners are cheap, and the Ferd and Chebby guys have 'em, so why not?

Sorry if I sound harsh - I did the same thing with my '63 Chebby inline six when I was a teenager. I was CONVINCED that the chrome Spectre air cleaner made it a little faster, but the glass pack REALLY woke it up! I could keep up with city busses after that... :)

I know it's hard, but listen to the knowledgable folks on this board and make sure the engine runs the way it's supposed to BEFORE you go adding hot rod parts. It'll never be "fast" , but you might be surprised at how much fun a stock or near-stock slant can be when it's at it's best.

Best of luck!
Author:  DusterIdiot [ Fri Jul 27, 2007 4:50 pm ]
Post subject:  Truth be told...
Quote:
It'll never be "fast" , but you might be surprised at how much fun a stock or near-stock slant can be when it's at it's best.

Actually it can be 'fast' (just not muscle car fast)...
I once took down a guy in a 1972 Duster 318/Auto/stock 2.76 rear and bigger tires in the back....I whacked him by a full body length to the next light with my '74 Duster 225/1barrel Holley 1945/A-230 floor shift manual tranny/3.21 rear gears/stock tires....His girlfriend asked what motor I had and I replied 'A Slant Six!!!' and beat the stunned clod to the next light. Match a good running motor with a nicely picked set of parts and it will serve you well...(both at the gas station and in traffic...)


-D.Idiot
Author:  1974duster kev [ Fri Jul 27, 2007 10:38 pm ]
Post subject: 
for 500 bucks and the best seat of the pants difference would be drop some 3.55 gears into that badboy it'll pick up real quick yet keep decent rpms on the street i'm goin 4.10 gears in my duster though probably tommorow if theres time but those are pretty steap for the street and would most likely hurt gasmileage.But some go go pickup.

Kevin
Author:  Blackdog455 [ Fri Jul 27, 2007 10:45 pm ]
Post subject: 
where can i get these 3.55 gears?
Author:  sick6 [ Sat Jul 28, 2007 4:47 am ]
Post subject: 
hang on a second- what diameter rear axle do you have?

you may only have a 7 1/4, which is what stock normally is. finding a set of 3.55's for a 7 1/4? you will be looking for a very long time.

if you swap in an 8 3/4 axle for more available gears, you will need a driveshaft shortening, so expect to pay like around $250+ for the axle + the cost of the gears + cost of the driveshaft chop and straightening. you'll eat more than $500 really fast. (this will also effect what diameter tires you are running, and then you need to change out or re-gear the speedo, and thats more money).

as dusteridiot said, take a look at that distributor, and check through this site for tuning tips. combine that with the super set up and a set of dutra's and you'll be happy. Once you have enjoyed that for awhile, and fully understand how to tune such things, move on to the next level with a bit better cam, rear gears, etc. Once you get the basics down you'll be very happy you didn't spend allot of money so fast on parts that just might not be so great together down the road.
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