Hello Guys,

I have a '67 Dart GT it is my son John's(15) first car. We are doing a full restoration on it, but want a little more power in the /6. Can you help with the proper modifications ? I'm just looking for more power and a little exhaust rumble. This will be a daily driver so it needs to run on 87 octane pump gas.

Thanks

Hank

What's your budget? Do you have the facitlites and tools for tearing an engine down?

Can you define "a little more power?" That means different things to various folks.

Just off the cuff, a supersix, 2-1/4" Head pipe, and bumping compression will get you a noticeable increase.

CJ

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Part of Tyrde-Browne Racing

I'm thinking $3,000.00 budget and yes I have built several big block engines so I have the facility and tools to do it and a machine shop nearby. OK a little more power is 250-275 HP area.

OK.. Those numbers aren't a little more HP. They are a lot more HP for an NA build. I don't think I put down that top number.

Your going to want headers or Dutra duals, ovesize valves, well sorted out head, a good size cam, compression, big 2bbl or small/medium 4 bbl. Ignition, perhaps metric pistons and rings. Look into K1 for rods and pistons. (I still think they need spurt holes in those rods...)

250 HP is roughly double stock power. 275 is going to be tough to do and still maintain reliability for street use without forced induction or nitrous. It's entirely possible though. Punch the search button a bit here, look through the Freqently Asked Questions sticky, and hit the Articles section.

If your running an automatic, look into gears and a converter with more stall. If you find something that will stall in the 2500-3000 rpm range, it still should have street manners.

Contact Frank about his intake manifolds. They will probably meet your requirements. I'm not sure you can squeak by on three grand though. I think 4000 is going to be a more realistic number to hit those HP goals without a power adder.

CJ

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Part of Tyrde-Browne Racing

For reference, 225 HP in that car will get you something in the low 15 sec range. Might be better to think about how fast you want to go, rather than use HP figures.

Sounds like a fun buildup for you and your son.

Lou

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Home of Slant6-powered fun machines since 1988

Well I think never building a /6 and working with BB and don't have a realistic view of the capabilities of the 225. I need it to be a daily driver type engine so do what type of modifications would you recommend for this type of build ?

Go to the FAQ Engine sticky at the top and go to the engine build matrix for the various builds. Doc says mine is a 160HP build with the 1 barrel. You can go up from there since it is pretty basic and which has the key/core must do's......
With a little bigger cam and two barrel or headers, 4 barrel, bigger valves and more porting you can push it over the 200 HP mark.

http://www.slantsix.org/forum/viewtopic.php?t=23314

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

thanks Ted, checking it now

Sure, just what little I did made a huge difference and my 74 Swinger is allot more fun to drive. One of the key's that brought all the work together to be realized, was the distributor recurve. There is a sticky for that too.
It even wakes up a totally stock motor and helps with the mileage. If you don't the SL6 is not as peppy.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Ted

If you don't mind I'm going to copy your recipe because I love torque. This seems to be a good combo my son can handle for his first car.

Thanks again

As Ted and CJ have said, I aggree. When I got my van it needed some love. I played with that 1 bbl carb till I was blue in the face. I then found a 2bbl manifold and went with a weber DGV carb. Once that was dailed in I was more than happy with performance, it really woke the van up! I'm currently running a tired old motor with 2-1/4" exhaust with a 2-1/2" muffler, I goofed when I bought the muffler so I just fitted it to the exhaust. I've been stock piling parts for a rebuild which will be close to what Ted has when done. Should be fun, I just can't kill the motor for the rebuild!

Well you can always do what I did........take it to the local Valvoline oil shop when your too busy to change it your self.....(I was working 16 hour days and driving 120 miles to work) and get your self a bad oil filter.....which they supplied and installed, and have it collapse internally and not go into by pass mode which starves the engine of oil ........and have it happen at 4:00 in the morning 50 miles from home.......you can't go too far at 60 mph on the freeway with out oil pressure.....that will do it......I ended up driving it to an auto parts store, waited for the store to open and bought another filter, screwed it on and bingo! 45 lbs. oil pressure,,,,,,but the number one rod bearing sure sounded bad......drove it 60 miles back home and pulled it.
The number one rod turned black from the heat.......but it still ran with a galled crank. The crank is now .010 under, rods resized and shotpeened for strength. The number two rod was burned a little, the 3rd a little less and so on....... I was running 10-30 Valvoline synthetic so it protected the the rest of the motor.

The "torque build" was per Doc's recipe for a heavy car (3400 lbs.) and a 2.76 ratio 8 3/4 Sure-Grip rear end. It is nice and spunky engine build.......

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

OK Then I'm gonna steal Doc's torque recipe either way I like torque.

Thanks again

Hank

what is the stock head chamber volume for the 225 /6 ?

Most "revised chamber" 68 and up heads (un-milled) are in the 58 to 60 cc range.
DD