Quick... which way's better (225/273)

[Mopar44134]

225 with a turbo would be cool and different. No turbo, 273. 318/360 vs 225, 225.

 

[1973dust]

I've always wondered if the complete fuel injection and turbo setup from a late Buick 3.8 would work well on a 225 slant as the engine size is so close. I think the cool factor would be off the charts but I'm sure a mild V8 would be much cheaper.

 

[MidnightSwinger]

I would never spend money putting a 273 in a 67+ A Body. Either put a 360 in it or build the slant.

 

[273]

I would never spend money putting a 273 in a 67+ A Body. Either put a 360 in it or build the slant.

I agree 360 or even 318 especially magnum's be a better option but even 273 has more potential than a /6, +48 cid, 2 more intake ports plus better heads, and even better heads are available, especially if your after street able 300 hp.

Not knocking the /6 I think it's kewl little motor when built up but more of a labour of love then a practical choice, especially at 300 hp, I doubt most of them even make 225 hp.

 

[Oldmanmopar]

And lest you think a slant six cannot sound good this is mine. It runs as well as it sounds. Granted, they'll never be a V8, but they weren't meant to be.

Rusty that is the coolest sounding slant I ever heard. In 1971 my dad had a 62 with a slant 6 push button. He left me take it to a football game.

I was coasting it backward on a hill in neutral holding the throttle to the floor and then pushing in the low gear button. I destroyed the right rear sears snow tire he just put on being able to push the second button while it was still going backward. The J's I put on that hill were enormous. He saw the tire a couple weeks later and I blamed it on my older sister. I don't think he believed me because I never drove it again he bought me a 66 GTO

I would love to take your 66 for a ride it sounds like I could hit drive with yours. Does it have a sure grip?

 

[MidnightSwinger]

Didn't the OP say

I agree 360 or even 318 especially magnum's be a better option but even 273 has more potential than a /6, +48 cid, 2 more intake ports plus better heads, and even better heads are available, especially if your after street able 300 hp.

Not knocking the /6 I think it's kewl little motor when built up but more of a labour of love then a practical choice, especially at 300 hp, I doubt most of them even make 225 hp.

I agree with all of your points. My counter point to the 273’s potential vs the slant six is, no matter what you do, the 273 has no bottom end torque. Over 3,000 rpm? Sure. That just sucks in a “heavy” car like a 67+ A body.

Then there is cubic dollars. How much is that “running” 273? How much is a running 360? About $500 here in Northern California will get you a running roller/magnum 360. The 360 has more cubic advantage over the 273, than the 273 does over the 225. The 360 is also almost 30 years newer than any 273.

 

[273]

I agree with all of your points. My counter point to the 273’s potential vs the slant six is, no matter what you do, the 273 has no bottom end torque. Over 3,000 rpm? Sure. That just sucks in a “heavy” car like a 67+ A body.

I wouldn't say no torque but obviously less than a 360 but more than a /6 since torque especially at those rpms is mainly do to cid. But I get your point and agree 360 especially if the OP gonna 3.23 gears or higher and a low stall.

Side note, Hp per torque is a lot less under 3,000 rpm 1000-3000 rpms = hp is 19-57% of torque so hp is a little less sensitive to torque change down there.

Then there is cubic dollars. How much is that “running” 273? How much is a running 360? About $500 here in Northern California will get you a running roller/magnum 360. The 360 has more cubic advantage over the 273, than the 273 does over the 225. The 360 is also almost 30 years newer than any 273.

I was just comparing the 273 to /6 in potential it's miles ahead, as for 360 I agree would make most sense.

 

[RustyRatRod]

Rusty that is the coolest sounding slant I ever heard. In 1971 my dad had a 62 with a slant 6 push button. He left me take it to a football game.

I was coasting it backward on a hill in neutral holding the throttle to the floor and then pushing in the low gear button. I destroyed the right rear sears snow tire he just put on being able to push the second button while it was still going backward. The J's I put on that hill were enormous. He saw the tire a couple weeks later and I blamed it on my older sister. I don't think he believed me because I never drove it again he bought me a 66 GTO

I would love to take your 66 for a ride it sounds like I could hit drive with yours. Does it have a sure grip?

It's a 64 and no it's an open rear. I had a sure grip in it for a while with a 3.90 gear. It was too much gear for the 13" tires. lol Mine is a three on the tree though.

 

[ValiantKevin]

If you already have the 273, why is this even a question?
But if you don't then, for me,
the obvious choice is /are;
1) a hi-pressure, alloy-headed 360 with a very modest cam. Get the pressure up to say 190, run an A833od with 3.73s for 75=2540 with 27" tires. or
2) if you want to keep the regular A833, then, run a 318/340, but for performance., you'll need more rear gear, with the 318 . or
3) run a stock Magnum, any size with your choice of rear gear.

Well when I posted the question it was because I found one for sale on the CHEAP cause a guy was moving and needed his storage unit emptied... but now as of last night, yes I have the 273 now.

 

[ValiantKevin]

K-member. I had the schumacher mounts but I sold the left side. which is the same as 273 318 mount. The right side which would be the one needed is still here somewhere. You can have it if you need it. Just pay the ride .

Messaged you

 

[ValiantKevin]

And lest you think a slant six cannot sound good this is mine. It runs as well as it sounds. Granted, they'll never be a V8, but they weren't meant to be.

Damn that sounds SEXXXY... nobody would EVER guess that's a 6 lol

 

[AJ/FormS]

Well when I posted the question it was because I found one for sale on the CHEAP cause a guy was moving and needed his storage unit emptied... but now as of last night, yes I have the 273 now.

Well there you go, a 4bbl, a higher stall, gears in or near the 4series, plus slapper-bars are your friends.

 

[mygasser]

Damn that sounds SEXXXY... nobody would EVER guess that's a 6 lol

not until you rev it anyway

 

[ValiantKevin]

Well there you go, a 4bbl, a higher stall, gears in or near the 4series, plus slapper-bars are your friends.

It's a manual so no stall needed and yeah, 3.23 suregrip in there now will be getting swapped out later for a more fun ratio lol
3 speed is going away too, have a rebuilt 4spd (non OD) going in with the motor swap.

 

[Mopar Sam]

Besides exhaust and motor mounts (which I see now companies make slant 6 to V8 mounts so I don't have to switch my K member)

You can use a regular 67 up a body mount on the left side, and a mount bracket from a 318 truck on the right side. No need to waste money on "conversion" mounts.

 

[65TerrorCuda]

Welcome to the 273 club Kevin!

 

[AJ/FormS]

Well there you go, a 4bbl, a higher stall, gears in or near the 4series, plus slapper-bars are your friends.

Yes I know you have a 4speed for it,
and I know the little 273 can be fun with a 4-speed. But. if you go the performance route that most guys go, yur probably better off with a higher stall/auto/and big gears.
As for me, if I had to run a 273/Mopar4-speed, I would order up a Commando gearset, a GVod, and 3.91s, and start splitting gears;
Road gears with 3.91s would be;
12.08/9.42--7.51/5.85--5.47/4.27--3.05
Gearvendor splits in red.
Not all gears can be used sequentially.
Normally, I shift; 12.08-7.51-5.47-4.27-3.05 ;splits are progressive, at ........ .62---.73--.78--.71od, But
When I'm showing off, I shift;
12.08-9.42-7.51-5.47-3.05 splits of
...... 78---.80--.78--.56od
The 5.47 gear will get you 5000=73mph; that's One tug on the stick, and Two electric shifts.
The 3.05gear gets you 73 mph at 2770rpm; 65 at 2470

Sounds like fun but
I'd rather run a 4-speed Torqeflite LU

 

[MidnightSwinger]

I wouldn't say no torque but obviously less than a 360 but more than a /6 since torque especially at those rpms is mainly do to cid. But I get your point and agree 360 especially if the OP gonna 3.23 gears or higher and a low stall.

Side note, Hp per torque is a lot less under 3,000 rpm 1000-3000 rpms = hp is 19-57% of torque so hp is a little less sensitive to torque change down there.

I was just comparing the 273 to /6 in potential it's miles ahead, as for 360 I agree would make most sense.

Yeah, but I never mentioned anything about the potential between the 273 or 225. I only stated that I personally would not swap a 273 into a later a body.

Let me ask you this. How many 273s did they put in trucks or vans? How many slant sixes did they put in trucks and vans? Stock for stock, 2 bbl slant six vs 2 bbl 273 in a heavy vehicle and you need off idle grunt…


Anything outside of that comparison really isn’t apples to apples because you can modify anything as far as your skills and $$$ can take you.

 

[ValiantKevin]

Welcome to the 273 club Kevin!

View attachment 1716423935

Sweet baby jesus lol and thank you

 

[Oldmanmopar]

It's a 64 and no it's an open rear. I had a sure grip in it for a while with a 3.90 gear. It was too much gear for the 13" tires. lol Mine is a three on the tree though.

is it an 8 3/4 I have centers with better gears.

 

[Jim Kueneman]

You will not get 300 HP out of the 225 without heroics or forced induction. I think my 225 (dual one barrels, decked to 9:1, oversized valves, Oregon Cams 2106, Dutra Duals) is making about 270HP and 250 ft-lbs of torque. Personally I would rather drive this than my built 360 Valiant. They are totally different animals and if you are only looking for some HP number than the V8 is the only option. If you just love a well running slant then the built 225 can't be beat.

 

[RustyRatRod]

is it an 8 3/4 I have centers with better gears.

Nope. It's a 7.25. I have a 9" that I have narrowed to A body width I'm gonna put in it. Overkill I know, but I got it for free and have very little in it, so that's what it's gettin. With 4.11 gears. But I'm also puttin a T5 transmission in it at the same time so it'll have OD.

 

[mopowers]

I wouldn't put a dime into a 273, when you can pick up a running (or close to it) 360 or 5.9 for relatively cheap, but that's just me. From there, the choice would be either a 360 or your turbo slant idea. If you want something different build the turbo slant. If you want something cheaper and more powerful, go with the 360/5.9. If it were mine, the slant would be pulled for good the day I brought it home. Just my $0.02.

 

[RustyRatRod]

It is doable, normal aspirated slant six.All that is required is the proper budget.

I don't disagree, but it's not a simple task. I don't build any engine shooting for a number. I just build it like I want.

 

[318willrun]

You can use a regular 67 up a body mount on the left side, and a mount bracket from a 318 truck on the right side. No need to waste money on "conversion" mounts.

I knew the left side, but i did not know that about the right side. Thanks!!!