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- Thread starter Dartswinger70
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Picking on my namesake
The easiest way if we assume similar VE% and efficiency is Just times Cid and rpm / New Cid = New cids rpm, 360 x 5500 rpm / 273 = 7,253 rpm, 318 = 6226 rpm.well come on.... actually @273 , what RPM would a 273 need to spin to make the same power as a 360? since you love that math
Or divide by desired rpm to see what cid you need.
That's if VE% and efficiency is the same less efficient = more rpm, higher efficiency = less rpm a lot of time engines that operate at higher rpms are more efficient so the rpm spread is narrower a lot of times.
I had to defend my wanting a 400 hp ish 273 against all the 360/408 guy's probably why I'm defending the 273, 318's etc.. all the time.
That's what I originally wanted to build was around 375-425 hp 273 at 6500-7500 rpm, for a Time Attack 65 Cuda I was trying to build, but never happened, realized that sport was above my pay grade. Bought a running 360 68 Valiant play toy instead, guess they won
I just purchased a really sweet little 68’ ,273 a few weeks ago .
Complete,,,,Intake to pan,,,even has the points distributor still in it .
It is really clean and still has what looks like the original red paint on it .
It’s gonna get a new set of high compression pistons ,,and a little more cam .
And that’s pretty much it,,,other than the usual rebuild stuff,,,bearings and all that .
Tommy
Complete,,,,Intake to pan,,,even has the points distributor still in it .
It is really clean and still has what looks like the original red paint on it .
It’s gonna get a new set of high compression pistons ,,and a little more cam .
And that’s pretty much it,,,other than the usual rebuild stuff,,,bearings and all that .
Tommy
And here lies the problem. There is no need to build a 273 (or 318 for that matter) to compete 1 on 1 with a big cube engine. Although rated different, the 360's were only rated at 245 horse. NHRA rates them at around 300 horse. You can build a 300 horse 273 without too many trick parts. A 300 horse 318 is an easy build. No reason to talk about torque. The small engine can't compete there.well come on.... actually @273 , what RPM would a 273 need to spin to make the same power as a 360? since you love that math
One could go fast for cheap a lot of years ago. When there were swap meets all over the place you could by new parts still in the package for 1/2 price of new and sometimes better. Bought several race cars that were 1/2 finished or someone didn't know how to run a Mopar and usually got those for pennies on the dollar. Don't know what the newer wheels go for but I hardly ever see them advertised and well, not really interested in those anyhow.
They can if the drivetrain is factored in, engines of similar power eg.. 300 hp, but vastly different displacements (rpm, powerbands), if each geared to take advantage of each's powerband they generally will be putting similar torque to the ground.
Used to turn a 440 7300 every pass. The car needed a bit taller tire....shifted when I saw 6900. The thing was still pulling at 7300! The teen I mentioned earlier was shifted at 6200 and anything after that was it.
I wonder how the 3.45 crank with a hyper smog flat top that can achieve zero deck or a hair above would perform?
I have a 318-3 crank that is at 3.45 and in mocking it up with a oem smog slug its just above deck.
So with that I could reach zero or better and to me thats a win just there but wonder if the tiny increase in stroke would be noticeable even if categorized in a way where one might say "for some reason it just runs a bit better then other 318s" like in the same way when you buy two of the same cars off a lot and for some reason one is always a 1/2 car winner over the other.
I have a 318-3 crank that is at 3.45 and in mocking it up with a oem smog slug its just above deck.
So with that I could reach zero or better and to me thats a win just there but wonder if the tiny increase in stroke would be noticeable even if categorized in a way where one might say "for some reason it just runs a bit better then other 318s" like in the same way when you buy two of the same cars off a lot and for some reason one is always a 1/2 car winner over the other.
I would think it's all about what heads you use.
Or more than 1/2 car length.....
Here's a 318 with W2's on Methanol. I don't have engine photos but a buddy put this teen together. It's a + .030 318, W2's, Enderle Injected/methanol, 5500 stall, Glide, 4.88's in a 9", 2750 with driver. It ran 9.95 @ 135. Teens can work! HP calc. is about 550.
I love it!
The heads play a big part but so does the rest of the combination....
Do ya know what kind of rpm it turns?
Fox body guys have dreamed BIG with their 302's for years and years. And, because of that, there are some FAST 302 fox bodies out there. Just think if more Mopar guys felt the same about the 318......
Icetech
Well-Known Member
It seems like most mopar guys are afraid of the smaller bore. But really, how hard is it to notch a cylinder??? I mean the valve is only gonna be 0.045" closer to the cylinder wall.
Besides, a 2.08 intake valve will fit a 318 without a notch...
Too much analyzing things to death.
I love small block Mopars, 273- however big you can afford, or want to build.
Icetech
Well-Known Member
Most don't seem to be worried bout notching... there is a thing where if you are under 4" bore it is scrap.. that's why a 390 stroker can't run a 16 while a 408 can run 9s with barely ported smog heads
340six
King Of Bling
DTM #2You just defined yourself as a troll!
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