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  #16 (permalink)  
Old 06-03-2008, 04:25 PM
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Mighty Mouse

You guys are gonna have everyone wanting a Mighty Mouse. While everybody's on the subject. What would be the best 305 engine for a build? Best year,worst year?

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  #17 (permalink)  
Old 06-03-2008, 04:39 PM
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many years ago i had a high school student that worked for me, he was paid in parts, training and machine work. he wanted to build his 305 that was in his trans am. we bored it .030 silverlite flat tops, cast rings, decked .020, stock stroke, 416 heads which he did himself, new guides, machined for 1.94 int. 1.5 exh. unshrouded the intake wall. he wanted a solid cam cause his dad had told him about the duntov 30-30. so i got him the solid cam and he assembled it himself. he installed it and he told me his 600 was to small for a carb. he put my 750 dp on it and again told me this was to small. i took his car for a ride and was very impressed with the power. he put my 850 on it , it was a little big. ended up with the 750 on it. this thing was a bear, no dyno numbers, sorry for the long wind, but i think there is a place for the 305 in hot rodding. maybe now is the time.

sam-missle
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  #18 (permalink)  
Old 06-03-2008, 07:40 PM
How fast is fast enough?
 
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Having the smaller bore makes them a little more fuel efficent (again with an "all things being equal" approach)... perhaps because of gas prices and because you can't find a decent 350 without tripping over thirty 305's they may become more mainstream. For a decent efficent powerful street engine in a 80's chevy I'd be tempted to recomend doing a rebuil don the 305 already in it and bolting on a turbo charger to a ported set of heads, performer intake, and a cam with a little more lift... I'm not saying it'll ever be a 350... hell I'm not even really a fan of chevy 350's either, but there is potential for a nice engine if built right.
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  #19 (permalink)  
Old 06-03-2008, 08:34 PM
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Huh, I get 305 cores for free most times if I just get 'em out of the way. If I pay for anything it's usually what they're worth in scrap weight. When economics gets entered into the picture, stroked 305's make sense.

Those crappy aluminum L98 'vette heads work well on 305's too.

One thing that most folks overlook is that with smaller bores, good late model combustion chambers and proper piston to head clearance....combustion is efficient. That means it's more tolerant of higher pressures with the the same fuels. This is only a slight edge over larger bores but it is something to consider.

All things considered, a stroked 305 can make decent power for a street beater but it will be at lower revs. This may not be a bad thing either, with taller gears being preferred for economy, lower revs would be a slightly better match.

I guess it boils down to what you have to work with and what your goals are for the engine.



Larry
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  #20 (permalink)  
Old 06-04-2008, 06:58 AM
How fast is fast enough?
 
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Quote:
Originally Posted by coldknock
When economics gets entered into the picture, stroked 305's make sense.
Larry
Considering you're looking at spending $700 on a stroker assembly I think stroked 305's would be a BAD idea.
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  #21 (permalink)  
Old 06-07-2008, 12:13 PM
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Quote:
Originally Posted by Double_v23
Wow, way to burn that guy, maybe he will come back after not having posted anything since 2003 and make a rebuttle.

Please check the dates on the threads before you respond to them.
dOES THE AGE OF THE THREAD REALLY MATTER? I am new here so that thread is new to me, not to mention its a good thread to keep in the loop for ppl looking for upgrades to their 305's and secondly it got more posts this time around then the first time. Are 305's still around? yes. So is this a dead topic? no. k thanx bye.
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  #22 (permalink)  
Old 06-08-2008, 07:07 AM
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dOES THE AGE OF THE THREAD REALLY MATTER?
No.
Has anyone here breathed an oxygen molecule that has been both inhaled, and exhaled from Plato's lungs?
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  #23 (permalink)  
Old 06-08-2008, 10:34 AM
How fast is fast enough?
 
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Quote:
Originally Posted by Stroke
No.
Has anyone here breathed an oxygen molecule that has been both inhaled, and exhaled from Plato's lungs?

Even though he breathed a lot of them I doubt any of the oxygen molucules that Plato exhaled are still around.... What does that have to do with anything anyway?
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  #24 (permalink)  
Old 06-08-2008, 10:39 AM
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Even though he breathed a lot of them I doubt any of the oxygen molecules that Plato exhaled are still around.... What does that have to do with anything anyway?
Nothing, it only has to do with...
Quote:
dOES THE AGE OF THE THREAD REALLY MATTER?
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  #25 (permalink)  
Old 06-08-2008, 11:03 AM
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Quote:
Originally Posted by SSedan64
You guys are gonna have everyone wanting a Mighty Mouse. While everybody's on the subject. What would be the best 305 engine for a build? Best year,worst year?
any 305 made after 1983, #416 heads and flat top pistons.
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  #26 (permalink)  
Old 06-08-2008, 11:25 PM
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  #27 (permalink)  
Old 06-09-2008, 05:15 AM
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C'mon now, here is the old material on this...
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  #28 (permalink)  
Old 05-20-2009, 05:22 PM
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How does one stroke a 305?
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  #29 (permalink)  
Old 07-21-2010, 10:32 AM
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Im resurrecting the dead.
This is the bottom line with the 305
Given the number of GM cars produced with this engine it should be more popular. Especially with the latest trends being efficiency with a small engine. Take the LS1 for example, the bore is less than 4" and there's an even more striking fact! The LS1 and 305 share almost the EXACT same rod to stroke ratio, bore to stroke ratio and of course bore spacing. What? Whats that? You cannot compare a Gen 3 to an SBC? Well, no, but the physics ARE still the same. Meaning given the same designs the 305 should look a lot like an LS1 as far as curve signatures given the 305 is allowed to breathe with a nice ECU. Does this mean that the 305 will be popular? Hell NO! According to the old timers its not worth building a 305 when the 350/400 have more cubes and THE SAME bolt patterns for parts! Not to mention its takes skill to build a 305 vs a 350. I mean look at the options for a 350 for ANY part and you will see that ANYONE can build a 350 with a call to a parts house. With the 305 you actually have to measure stuff, do calculations, find parts that will work. Cylinder heads for a 305 are VERY hard to find. There are 2 purpose built heads on the market right now, both aluminum. The first is the TFS 23degree 175cc heads with 1.94/1.50 valves and 58cc chambers. The next is a SPEC head from Brodix designed by French Grimes for the Racesaver series sprint cars. Racesaver is a 305ci, hydraulic flat tappet cammed, sealed SPEC engine that has to be inspected by officials before being certified it's not breaking the rules. These engines produce anywhere from 420-460hp using 99 octane (methanol) and they are extremely fast. There are no special tricks to them and the heads aren't the best. I recommend looking at them if you want to get an idea for building a cheap 305 that will produce 350-400HP. Last but not least there are a few builds on the net for 305's, my favorite is any of them that use cheap Vortec heads. I also have some threads about 305's on thirdgen.org, maliburacing.com and speedtalk.com with very good info. NOW: to answer the 305 stroker questions. The 305 stroker also known as the 334-340ci is about $675.00 through powerhouse or enginekits.com and the one I like is by Speed O Motive which is higher quality. It uses a small journal 3.750" stroker crank and a 5.700 connecting rod. NOT a 5.565 like a 400ci. Being that I LIKE 305's because I go for the underdog, they represent MORE of a DIY approach which is what Hot Rodding is partly supposed to be about (and you dont see much of that "mysterious" building anymore). Other than that, I have NOT found much of a reason to build a 334, besides the fact that Joe Sherman (Engine Masters Challenge winner 2008) told me its worth it (he did it), and there is a guy with a tuned port camaro running one with stock 081 TPI heads and stock TPI and he is running 13.4's @ 98mph with 2.73 gears! SO..As an ending statement, I see 305's getting more popular in the next 20 years as car technology goes further away from gas and nostalgia builds take precendence. If you dont like it, LUMP IT and go build a 350, no big deal.

Last edited by ThirdDegree; 07-21-2010 at 10:49 AM.
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  #30 (permalink)  
Old 07-21-2010, 11:49 AM
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Quote:
Originally Posted by 85CHEVY
yes a 334 or stroked 305 is a very high torque lower reving small block, they are supposed to produce quite a bit more torque than a 350 because of the small bore and long stroke. I would be interested to see how one runs!
Doesn't.

The torque and horsepower an engine puts out is first and foremost related to displacement. Specific use of cam timing, compression, amount and type of induction and exhaust have a large influence, but of two engines identical except for displacement, the larger will always be the more powerful. Playing games with stroke length only moved the RPM point where the maximum occurs, it doesn't change the maximum amount nor what's called the power area under the curve which contains the same surface area.

GM with the 305 using a 350 crank was concerned with bringing the torque peak of a smaller engine in line with the larger 350 such that they wouldn't have to regear transmissions and rear axles, a considerable cost savings to them. The gear ratio being one function that needed to be solved with the long stroke 305, the other was meeting CAFE fuel mileage standards which is easier to achieve with a smaller displacement engine and high gear ratios which want more low RPM torque.

For the cost of building a stroker 305 you can build a 383 out of a 350 and be a pile happier with the result.

Bogie
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