THE OTHER GUYS 305 VS 350-SBC SHOOT OUT!

[Music] hey guys richard holder here let's talk about the much-maligned 5-liter 305 small block chevy it's quickly becoming my favorite other guy's small block but here's the question should you modify it or just step up to a 350 let's find out in this video we're going to take a look at modifications we made both to a 5 liter 305 small block chevy and the larger 350 now we made common upgrades the kind that most normal guys would do we did heads cam and intake on the 305 and we also did heads cam and intake on the larger 350. but here's the question if you already have a 305 which is a very common motor should you go to trouble of upgrading that motor or should you just step up to the larger 350 then upgrade that motor now we know that the bigger motor obviously is going to always make more power but if you already have the 305 can you get good gains by upgrading that little five liter let's find out to start off our comparison we're going to take a look at a 5 liter 305 chevy this was actually a tune port version obviously the very famous i rock motor so it's a five liter uh two port uh 305 small block this was a stock motor it was one of um maybe one of my favorite 305s we've ever run only because it came from the guys at the chevy race shop this particular motor was sl so low mileage that i think it probably was brand new it may have been one that came off the here's my story i think it came off the assembly line went to the chevy race shop and has never been put in a car and had never been run other than the break-in that they did when they make the motor ready to put in a car so we got this motor and it sat for years and years and years at west tech and i finally decided to run it and ran it and took it apart to modify it as we'll see the modifications and i think i shouldn't have done that i think i should have kept this thing the way that it was because it probably was maybe the lowest mileage low lowest uh you know mileage or usage 305 tune port small block in existence and now it isn't anymore because we've modified it but i digress we ran this motor um stock with a set of long tube headers a holley hp management system and we ran it with no air induction system obviously the long tube header is an open exhaust an optimized tune an electric water pump and with no accessories on it so basically is kind of an optimized condition and that's why this thing makes more power than it was rated at run in this condition the stock internal stock the tune port combination stock throttle body stock heads cam intake all that stuff it made 267 horsepower and as we have come to expect from tune port motors it made a lot of torque it made 333 foot pounds of torque and you can see even down here near 2500 rpm it had over 300 foot pounds of torque tuned board motors make torque they do very well but what we did was modify this motor and did upgrades now it's important to note that when you see the modifications on this it made fairly good power and it's not just tuned port motors that make this power i did similar modifications on another test before starting with a 305 throttle body injected motor and we did basically the same thing we put a set of trick flow the super 23 heads the design for the small chamber 305 motor we put a cam shaft in it in that case we put a dual plane intake and carburetor on it and it made about the same power they get about the same gains kind of regardless of your starting point so if you're starting with you could even start with a late model vortech motor and not have to upgrade the heads they won't be as good as they the these trick flow heads but the stock vortec motor a 305 is a good starting point you might have to machine it to put valve springs in it put a cam in it put a decent induction system on it like this stealth ram that we're going to run or a dual plane carbureted manifold and you'll get good gains from the 305 so let's take a look and see what we did as we upgraded this tune port motor and in keeping with the tune port esque configuration what we did was install the trick flow super 23 175 heads designed for that small 305 bore we put a fairly decent camshaft in it not anything huge something that you might put in a still in a street application it is an xfi 268 cam from comp cams the xfi means it's basically a high lift version of their hydraulic roller stuff it was a 570 565 lift split a 218 224 degree duration split and 113 degree lobe separation angle the 175's had 175 cc intake ports it had 67 cc exhaust ports and 56 cc combustion chambers with a 19415 valve package the 194 valve obviously helps it fit in the smaller bore size on the 305. we had also a holley stealth ram intake manifold kind of a a high-rise or or tunnel ram style intake manifold with a big box on top of it and then a dual 52 millimeter throttle body attached to the opening which is more than enough for this power output so after adding the heads cam and intake on the 305 we upgraded the power output of the motor from 267 horsepower up to 367 horsepower so we basically gained 100 horsepower from this upgrade as you can see we pushed peak power out farther it was making peak power out closer to 6000 rpm now we did lose a little bit of some low speed torque down here in the 3500 range so just know that that and that's a combination of two things the one is the camshaft obviously much wilder camshaft than the factory cam timing and also the intake manifold a long runner factory tune port manifold is designed to make lots and lots of really low speed power because it has very long runners the stealth ram although it's kind of what i call an intermediate manifold not ultra long and not ultra short it still is going to shift power production higher in the rpm range so we made peak torque at 49 48 or 4 900 rpm whereas with the tune port manifold we made peak torque at 36 or 3 700 rpm so we shifted it by more than a thousand rpm going with this combination as you can see it's possible possible to make good power gains with a 305 and we're not limited there with with porting the 175 heads stepping up and cam timing going even to a possibly a different induction system or a ported version of this one we can certainly push power way past 400 rpm i think it's time that i did kind of a dedicated 305 and show some of the 305 guys the other guys 305 how how you can really make some good power with a 305 combination but now let's take a look and see when we made modifications to a 350. find out how a 350 of the larger 5.7 liter small block response compared to the 5 liter 305 we put together a 350 combination and ran through a series of tests uh adding heads cam and intake just like we did with the 305 this particular motor was westex gladiator motors was very famous from all of the runs that it made it had been beaten to death for years and years and years and probably had i don't know maybe it had a thousand dino pools on it um i didn't ever go back and count but we know that it was it was it was hundreds and hundreds and hundreds of runs because it was used forever before finally being replaced by the gladiator too it finally it deserved to rest but this was a small block and like the 305 it had some modifications we started out fairly mild this was a 355 it had a set of flat top pistons in it which were replaced they were it was it was 30 over so it actually had a set of forged flat top pistons and with valve release it allowed us to run a bunch of different camshafts because we put some fairly wild camshafts on this and tested big cylinder heads and all kinds of stuff but in this configuration it was run with a performer intake a 60 a dual plane performer intake a 650 demon carburetor and it had a very small camshaft in it which was an extreme energy 250 hydraulic flat tappet camshaft that cam offered a 432 440 lift split a 206 to 12 degree duration split 110 degree lobe separation angle it had hooker long tube headers and msd distributor on it and before you guys heard the 350 guys want to jump up and down and storm the castle we put a bigger camshaft in it also and that's coming up so take it easy and and so you're not thinking we're favoring the 305. this motor was also equipped with a set of airflow research uh 195 head so it had also had good heads on it didn't have the same trick flow heads now we wouldn't want to run the 175 heads for the small bore motor on the 350 anyway so they both had good heads they both had similar intake manifolds as you see because we're going to put the um stealth ram on this as well and even put the same camshaft in it so it's fairly comparable run in this manner uh with that camshaft and a dual plane intake our 350 produced 381 horsepower and 420 foot-pounds of torque but here's what happened after we installed the holley stealth ram intake manifold the power picked up a bit and we pushed power up to 395 horsepower although peak torque was down uh compared to the dual plane intake down to 416 foot-pounds of torque but since it's such a smile small camshaft it's basically a like an rv cam or something and it works good obviously it makes good torque and stuff but it's not ideal for a performance kind of application so here's what happened when we put that same xfi 268 camshaft and this was a hydraulic roller or the other one was a flat tappet camshaft but this was a late model block design for a hydraulic roller application so basically it would accept both um all we did was change the lifters out and put the cam retaining plate and stuff but after putting that xfi 268 cam which was the 575 565 lift the 218 224 50 and 113 degree load separation angle our peak power jumped up quite a bit it pushed power up to 436 horsepower and peak torque although was not changed dramatically it was still 416 foot pounds so what the camshaft did basically is add a lot of power out on the top end which we like um and it still had adequate torque i mean we're talking about over 400 foot pounds starting at 4400 or so and over 375 foot-pounds even down at 3000 rpm so the bigger motor obviously made more power than the 305 so we're going from you know we're gaining 60 or 70 horsepower which is quite a bit from the displacement so again you guys get to choose would you ra obviously if you have a choice between a 305 and a 350 the bigger motor is kind of the way to go but what if you already have the 305. now that we've discussed the modifications for both the 5 liter 305 and the 350 before we get to our conclusion i wanted to cover some of the math involved with this first of all we have obviously have to compare directly the 305 to the 350 and this is our 305 and here's what happened when we when we ran the same kind of modifications on our 350 and again not surprising the 350 makes more power than the 305 and it makes more power everywhere but let's do some simple math and we can figure out which one is actually doing better uh if we take a look at the 305 we made 367 horsepower using 305 cubic inches that's uh that gives us 1.2 horsepower per cubic inch if we look at the torque 349 foot-pounds based on 305 cubic inches we have 1.14 pound feet per cubic inch so it's doing fairly well kind of in the range that we would expect for a typical like modified small block and on the 350 side we made 437 horsepower for 355 cubic inches giving us 1.23 horsepower per cubic inch a little bit better than the 305 both in the same kind of range there and on torque it made 416 foot-pounds with 355 inches giving us a specific output of 1.17 compared to 1.14 for the 305. so they're both right in the range the 355 might have benefited a little bit from having that aftermarket piston and having slightly higher compression but again that's the gain from having more displacement you get more compression with the same piston design obviously so you guys can argue back and forth but what it shows is both of these small blocks were kind of doing what they're supposed to given the modifications that they made for each one now we can get to our conclusion okay guys what did we learn from our testing run on the 5 liter 305 the other guys small block chevy and the larger 350 first of all couple things no big surprise here a bigger motor always makes more power but a lot of guys will point to the fact that yeah that's because it has the big bore and head flow and improvement and all that and honestly i don't think that that's the reason here first of all let's talk about the 305 you can make a lot of power by modifying your 305 which i think is cool because the 305 really isn't limited by bore size so much as it is limited by the availability of cylinder heads for that bore size luckily for us and lucky for 5 liter owners the 305 guys trick flow makes that 175 super 23 head that works on that small bore so you actually have enough head flow to support quite a bit of power now we've seen 305 combinations make over 500 horsepower so you can certainly make power if you apply yourself if we were to port these 175 heads and improve the flow rate even given that bore size we could make a ton more power we could also make even more power if it was a 350 but i don't think that that's because of the bore size the bore size allows us to have a lot of other cylinder head choices which allows us to make more power and the simple fact that a 350 is a bigger motor so if we put a bigger motor and put the same combination of parts on the bigger motor you'll make more power but if we made it if we put that same combination on a 400 inch motor we'd make even more power so yes bigger is better but here's what i like about the 305. if you if you go out and you go race and you beat some and you tell them oh yeah it's a small block chevy a 350 with yadda yadda yadda all that on it that's cool if you say that you beat this guy with a 305 it's even better and that's why i like the other guys 305. armature holder guys make sure to like share subscribe ring the bell do all that stuff more other guys stuff coming up

Channel: Richard Holdener

Views: 81,174

Keywords: 305, THE OTHER GUYS, 350, SBC, UPGRADES, HEADS, CAM, INTAKE

Id: cZ4q01S9qA0

Length: 14min 29sec (869 seconds)

Published: Tue Jan 26 2021