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Old 10-17-2007, 07:40 PM
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305 stroker?

Hello, Has anyone built a 305 stroker using a 3.75 crank for a 350. I am considering this for a 72 Landcruiser. Mileage is a consideration with increaed torque when in the hills. I am wanting to use a Scat 9000 series 3.75 stroke crank for a 350 and short 5.56 rods from a SBC 400. This should work as the 400 and 305 piston pin height is the same. I do not know if there would be any crank case clearance issues or piston skirt to crank counterweight proplems. Has anyone built one of these and did they have sufficent low RPM torque?. Thanks in advance for any info.

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Old 10-17-2007, 07:49 PM
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It has been done using 5.7 rods but you end up having an engine that only has 334 cubic inches for about the same price as you could build a larfer engine with more torque. If I were going to build a smallblock for torque and mileage for a truck I would go with a 350 or a 383 use an rv camshaft,you can pick up some milage by going with a spread bore carburator(Q-jet etc) as opposed to a square bore (eddelbrock,holley etc) Long tube headers, daul exhaust, crossover or an x pipe and low restriction mufflers.

http://strokermotor.com/RA334.htm

Shane
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Old 10-17-2007, 09:59 PM
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I don't want to sound like an *** but what's the point? You could just pop in a 350 for less cost and hassle, you know the connecting rods won't smack the cam or the block on a 350. If you want economy/torque just put vortec heads and a tiny cam, or even better get a factory vortec engine which has a little roller cam in it already! (you can convert these to carb easily enough)
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Old 10-17-2007, 10:02 PM
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The 305's tiny bores already make poor breathing; barely enough to support 305 cubes. It can be done and has been done, but the crazy money you'd spend doing it isn't worth it... especially considering you can get running 350s for free on craigslist these days.
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Old 10-18-2007, 11:20 AM
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Thanks for the input. My main objective in this project is good fuel economy with high torque at low RPM (Off idle). The ease of maintainece and low cost parts of a Small Block Chevy make this a viable combination.
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Old 10-18-2007, 11:50 AM
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I think there's a misconception that stroke=torque. They are related, but I believe it has more to do with how the motor draws in the intake charge than it does some magic lever action on the crank. Take a 350 olds for example: generally known as a torquer motor (much more than a chevy is anyway) and it has a larger bore and shorter stroke than a 350 chevy. The difference is in the intake runners and heads. Wide intake and long runners are responsible for good torque and smooth power.

350 olds would be my choice, but you're limited on parts as compared with a chevy motor. If you want chevy get a 350, put a 600 carb on it, and RV cam and some conservative heads with a low 9's compression ratio. A 700 R4 would be a decent trans choice given the low first gear. You'll get decent mileage and really be able to haul the truck out of the hole.

Good luck!

K
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Old 10-18-2007, 01:24 PM
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305 stroker

I thought the 305 stroker originated out of Kaliforia as the emission inspector folks were even looking at block numbers, and the fact that "305" is cast in large numbers on the block. Could'nt swap to a 350 without them knowing, but you could "enlarge" the engine and get by. The aftermarket people would'nt be marketing these kits if there was'nt a need for it.
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Old 10-18-2007, 01:46 PM
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The problem is stroke doesn't equal torque the way they used to think. The perfect example is comparing a buick 455 (short stroke) to an olds 455. (long stroke). Numerous tests have been done that show while the buick has less leverage on the stroke, it has more piston surface area. Less leverage, but more force, so its a wash. The real benefit to shorter strokes is reciprocating weight and peak piston speed which help you rev higher. The other thing you hurt with small bores is that you're trying to feed the same cubes with smaller valves, so you further limit RPM range.

In a nutshell, a long stroke small bore engine is fine, but the 334 is a pretty poor choice for several reasons. 1- you need a custom crank for the small journal 305. Then you will have a very weak crank since the journals won't overlap. All of the forces will be handled by the counterweight throws, so keep it under 200 hp. 2- tiny bores like we talked about, and 3- you can make more torque for a tenth the price with a 350. Or, for that matter, for less than a 334 you can have a 383 with the same long stroke and I think you'll be pleasantly surprised that displacement often has little to do with MPG.

There is just no logical reason... even if the 305 core was free... to build a 334.
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Old 10-18-2007, 05:29 PM
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305 stroker

305's AND 350's share the same stroke AND journal diameters, there are no "small journal" 305's. The balance is different due to the weight of the rods and pistons being diffent. A 305 stroker is just a smaller version of the 350 stroker, ie 383. I have a 305 stroker, 334, in my truck. I bought the kit many, many years ago when they first started making them, only to find out when I finally tore down the motor I was going to use, the block was bad. Bought a Target Master 350 for the truck. Later found a good 305 block and put the 334 stroker together. After the Target Master dropped an exhaust valve (past warranty) the stroker went in and never ran quite right. Never used the truck much anymore and it sat. Finally tore into it again and found it had a 454 flexplate instead of a 400 flex plate included in the kit. So, it's almost back together again but I'm laid up with spine surgery #7. Can't really tell anyone how good a 334 stroker is other than mine has been a real PITA because C.D.W. out of California goofed on the flexplate. I just hope it runs decently, it does'nt need to be a powerhouse.
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Old 10-18-2007, 09:00 PM
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A 305 stroker would be a good engine to build if you wanted to keep a car "original" with the same type of block it had as new. Some circle track racers run quite will with the 305 stroker. A well-thought out build should give decent mileage with respectable punch. One would make a nice surprise in a street rod. If you are out strictly for the biggest bang for the buck, of course a 350 or 383 would be a better choice. But then again, everybody and his brother has one of those.

tom
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Old 10-19-2007, 12:48 AM
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Quote:
Originally Posted by junior stocker
305's AND 350's share the same stroke AND journal diameters, there are no "small journal" 305's. .
Dang it... I was just talking to a guy about putting a 400 crank in a 350 and got the conversations confused.
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Old 04-20-2008, 03:41 AM
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I Just Bought A Former Sprint Car Motor Which Is
12.5 Forged Pistons .030 400 Crank Turned To 350 Specs 6" H Beam Rods All In A 305 Block With Old 461 Casting Heads And Fuel Injection Ran With The Open 360 Cid Class And Turned A Respectable
13.68 Lap Time On A 1/4 Mile Clay Track I Have It In 3000 Lb Stock Car
And Am In The Top 5 Very Weekend Once I Put It In My 79 Mailbu
For A Big Money Drag Race And Ran A 13.12 1/4 Mile On 8 " Street Tires The Little Motors Can Run
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Old 04-20-2008, 10:24 AM
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I'm all for just doing a 383, but the 335 will have better fuel dist. than a 350 and can take a little more dynamic compression... something else to think about...
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Old 04-20-2008, 11:59 AM
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been thinking about this for my truck , with iron vortec heads
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Old 04-20-2008, 01:25 PM
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This 305 post may help you...joe
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