also the performer intake is called a performer 318/360
I had the 340 " radical resto" mp cam in a 318, with that intake, a small Holley and headers, in a truck with the pig that's in my car now (4:10) then pulled it and put in a Ramcharger. It was a ripper! I've had a few, still have one.
It's not a mismatch. Chrysler built millions of 318s with four barrel intakes. To my knowledge, not one single one ever had small ports. I'll put it like this. I've never seen one and I've torn down a LOT of virgin engines in the junkyard. If Chrysler engineers didn't see an issue with it, then there was none.
You can throw up all the excuses you want, the fact remains, Chrysler did it and didn't think anything of it. With a 318 built for performance with a good ignition curve, decent gears, and in a light A body It'll never be noticed.....and wasn't in much milder and much higher geared heavier vehicles. It's just a non issue. If you had a bog with the "mismatch" as you call it, I can promise you it was somewhere else.
Now, I can tell you WHEN it would be an issue. Lets say for instance, we had another application.....one that maybe wasn't even an engine. A large "hole" mated up with a smaller "hole". Lets say air was being pushed under pressure, no negative force from "in front". Then, I could see an issue with turbulence around the perimeter of the smaller opening. Considering the negative pressure surrounding an intake port in an internal combustion engine, I just don't see it as a problem. Although it can be argued (and correctly) that the air and fuel ARE being pushed into the engine, it is because of negative pressure "in front" of that air fuel charge. Were that not present, then I could see an issue.
I had a 77 D-200 4 Door, with a 318 ( not the same one mentioned in a different post) in o6 till o8. Daily driver. Same Lil intake, ran an eddy and then Holley. 4:30 Dana, 727., stock mannys on the out, That Truck HANDLED just like my Bros tricked out Dak R/T. And, it LOVED PAIN! No BS She Pulled HARD! I didn't build the mill ( got her from a redneck dude who's Grandpa built it, 500 bucks, sitting on the Last Farm in Carrollwood, and got it running) picked it's Sis outta there too. 700 for a club cab 400 . Lost my *** on that one. Rotted up. BAD. Should have never traded her. Gas was over 4 bucks a gallon, that's to obozo. The real estate/ building market SHOTOUT in FL. So I traded Her ( and a Lil $) for an 01 Dak sport 4.7 5 spd w ac. Cool truck, but.....
The two instances I remember, both had a 340 intake on an otherwise stock 318. In both cases, the ONLY thing we changed was the intake manifold, and the bad hesitation they both had disappeared. IIRC, (this was over 35 years ago, so, some details might be mixed between the two), the 1st setup was a '69 Dart with a '68-70 340 intake and a Holley 600 vacuum secondary. The head castings were the stock 675 castings. The rest of the engine was also stock, including the exhaust manifolds, single pipe system, and camshaft. We reused the carb and air cleaner without changing anything. Same distributor and timing specs too. The second time was basically a repeat of the first, except it was a '68 Barracuda that had a aftermarket dual plane aluminum 340 intake...I think it was a Wiand. Same size Holley, and the rest was also stock '68 single exhaust along with the rest of the engine. Both had aftermarket open element air cleaners with new filters (one of the first things we tried in order to get rid of the bog, including full tuneups). I never ran across that exact situation again, but, I got out of the retail repair business soon afterward, so, I expect I would have run across a few more if I continued in that type of work. No way to know for sure though.
In all of my cases, headers and duals were used. Except the D200, it had factory mannys, but a customized pipe set up. Big stuff, was on there when I got her. Thing Growled!
