This will be the start of my many questions about slant sixes for my buildup. I was looking at some book and it stated the 225 slants were in the 145 hp range early on and at 1976 they were about 85 hp. Sounds kind of fishy but with smog stuff and such perhaps this is somewhat true. IF and I say if there was a 145 hp 225 slant what years would this cover? I am looking at a couple of motors and found a 225 out of a 67 Dart GT and another in a 67 Valiant Signet. Each one had an air cleaner on it one saying 225 Super Six. Were these the high hp motors? Thanks for the help!!
Chas.

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Too young to throw in the towel,
Too old to be in the ring!

1964 Plymouth Valiant 2 door sedan,
duece and a quarter slant six baby.
(All Mopar, all the time. Any questions)???

The sticker on the air cleaner is only a sticker. The Dodge one should be Charger 225 anyhow. The '67 engines had milder cams than the '71 and later engines. If you set the ignition and carb up properly the later engines make just as much power as the older ones. The differences between gross and net horsepower have been discussed at length.

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Joshua

Now knowing that it was like 73 or 74 they changed the head so there was no 'drool tubes' does this make a difference. I was told the slants with the earlier heads are better but if the plugs are not shed the little washers on the early ones the tubes leak. No biggie. I just have a chance to get one of these 67 motors and want to buy the right one. A note, my 70 Swinger has a later motor in it. Runs good but does a strange thing. The reason its being taken out is this. When I leave a stop light and turn left (not hard turning either) it makes a sound like something getting hung up on the fan like a shroud or something. Nothing is rubbing though. I suspect a bad, cracked, loose pickup tube but its a question that has me looking for a new motor. Going to keep looking for a good slant. Gotta be one out ther somewhere. Thanks.
Chas.

_________________
Too young to throw in the towel,
Too old to be in the ring!

1964 Plymouth Valiant 2 door sedan,
duece and a quarter slant six baby.
(All Mopar, all the time. Any questions)???

I'd suspect a couple of things, either a bad motor mount that allows the fan or something to collide, or even a loose tranny cover can impact the flexplate and bolts on occasion. Oil slinger is a little warped.

Some thoughts to work your ideas by:

Crank hub changed after 1967...so if you have an early car with a late crank engine and an automatic you'll need an adapter ring to keep the torque convertor happy.

Revised Combustion chamber came in in 1968 (although it may be a bit earlier my 1967 Signet engine came with a revised combustion chamber head).

So that limits your head choices to 1968-1974 for drool tube heads, and 1975+ if you like the BL plug heads.

Stock camshaft improved in 1971...so if you degree the cam instead of lining up the dots you may have a bit more power there.

Any stock engine will show improvement using a "super six" 2 barrel setup, if you dial the timing and carb in properly. (That being said even a tuneup and super tuning the stock 1 barrel would show good improvement if everything else was in good shape).

Starting in 1976 the forged cranks went away and the lighter cast cranks became standard...no big improvement power wise, but the lighter crank and narrower bearing with the right improvements in breathing tend to 'spool up' faster (mostly the manual tranny guys can see/feel this on a regular basis as they watch the tach and time the rpm recovery between shifts).

Good luck in hunting for a replacement, if you're just going to do a fresh engine the 1967 blocks are fine, but you'll need a 1968+ crankshaft for your car (unless you have a 1966-1967 tranny in there now). If you pick a 1971-1974 you should have good results.

-D.Idiot