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Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

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Old 07-16-2007, 03:19 PM   #21
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305 and 350 are same stroke (3.48")

1bdbrd is right, the small bore is only good for so much (great daily driver)

$ for $ you just won't get the results out of a 305
if you really had to you could use the 305's crank and rods and accessories to save some cash
get a 350 or 400 block (377 w/ stock bore and 3.48" stroke) and some pistons and good heads and cam of choice and be happy
-OR-
try to find some of world products '305 Torquer' heads (had em on my '86 305 TPI Z28) and a mild cam and a performer intake, small carb and good exhaust . . .make about 300 hp and have a great driver . . . .but not a great racer

it just doesn't seem worthwhile to try for 500+HP with the small bore motor
I'd rather have a 283 that'll rev to the moon if I was gonna go small bore motor

honestly, I'd just suck it up and build a fun driver and look for/build a bad motor in the meantime
FWIW the 305 H.O. was rated @ 190 in the f-body and monte SS
I forget what the LG4 was rated at, but it's lame (great mileage lol)

good luck
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Old 07-16-2007, 09:51 PM   #22
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Back in the early 90s I built a 305 just to see what we could get and to my surprize we made 382 hp and 346 torque. What was done was a 305 block and a 350 crank which if I remember right makes it a 315 cu.in. Pistons were 10.1 flat tops with reliefs (hyper.) and used a Comp 280 cam. 1.6 fulcrum rockers. Heads were brand new untouched except springs Corvette 58ccs., and the intake was a Edelbrock RPM with there 650 carb. This engine had a killer idle, and I sold it to a guy that put it in a 71 Nova and that thing screamed. Nobody believed us that it was a 305 or should I say 315. If I'd do over i'd just stick to the larger cu.in. to gain even more but it was fun to do.
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Old 07-17-2007, 01:02 PM   #23
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I do not think a streetable 500-600hp NA 305 is going to be easy to build. My bench-racer calculator says more displacement every time I think about it. I imagine it is possible, I just don't see how. Without some form of forced induction, you just cannot get enough air/fuel through that chamber. You will save a TON of cash building up a 350, though the 500hp - 600hp you mentioned are still not going to be cheap. A 400hp 350 wouldn't be too expensive, but the money starts to grow exponentially past that point.
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Old 07-19-2007, 05:00 PM   #24
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You can take junk and make it fast, then all you have is fast junk, a 305 is junk when power is in mind, but a 335 stroker kit will liven one up if you were dead set.
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Old 07-24-2007, 03:34 PM   #25
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Im lookin to get like min 500-600 hp. = $$$$$$$

Someone's 305 was that fast I'm sure. Youíre not going to get there. The above recipe is about 350rwhp or a lot of suspension/weight work. Bet you canít get there either but I like the set-up and 250rwhp is twice what you have now.

The heads canít support high horse power! You will need a base with larger cubes or better heads and rpm for the hp level you said. I think you need to modify your hp level/goal. Your whole drivetrain, suspension and frame would need to be modified to handle that kind if power. IT WOULD BE CHEAPER TO BUY A MODDED LS1 THEN BUILD YOURS!
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Old 07-24-2007, 05:47 PM   #26
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theres a local guy with a 3rd gen camaro who swears by 305s. he has one in his car and i think it goes high 12s.
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Old 07-24-2007, 08:08 PM   #27
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I've seen a 9 second 305 once........and it had a turbo.
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Old 07-24-2007, 08:14 PM   #28
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Quote:
Originally Posted by alconk
Back in the early 90s I built a 305 just to see what we could get and to my surprize we made 382 hp and 346 torque. What was done was a 305 block and a 350 crank which if I remember right makes it a 315 cu.in.

305 and 350 are same crank, 3.48" stroke, the difference is the bore

the 334 is made the same as a 383, by using the 3.75" stroke 400 crank and a slight overbore
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Old 07-24-2007, 11:25 PM   #29
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I forget which mag did a 305 build that made near 400 and was very simple . They simply used Vortec heads with appropiate manifold , cam , rockers , and exhaust . All the parts could be switched to a 350 in the future . It was either Car Craft or Hot Rod . I want a 3rd gen but I'd go big atleast 400+ cubes , I really want a big block .
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Old 07-25-2007, 09:31 AM   #30
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You can make just about anything fast. Depending on how deep your $$ pockets are and what you consider fast.
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Old 07-25-2007, 10:00 AM   #31
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Still don't see a cheap or easy way to extract 500hp from a 305. Hell, it isn't all that cheap to get 500hp from a 350! For what he is asking for, he really needs to look at more displacement. The 305 is a great engine for what it was intended, but the cost of building it past 350-400hp is very prohibitive, and would most likely be unstreetable. He could buy a built 383 crate for a lot less money than he is looking at spending...

The Valves are a big limiter to what he wants to do, they are tiny! 1.94 intake just isn't going to flow enough (even with a perfect head) to support 500hp NA. IT is a shame to waste the shortblock he bought, I do understand that, but that is the price of hotrodding. Look at a lot of the small block crate motors available now. You don't see much in the 500hp range. THere are 425-450 hp ZZ4 combos out there that would move that F-bodya round sharply though.

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Old 07-25-2007, 11:05 AM   #32
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Quote:
Originally Posted by v8pwr
I forget which mag did a 305 build that made near 400 and was very simple . They simply used Vortec heads with appropiate manifold , cam , rockers , and exhaust . All the parts could be switched to a 350 in the future . It was either Car Craft or Hot Rod . I want a 3rd gen but I'd go big atleast 400+ cubes , I really want a big block .
That was on an engine dyno with no accessories, it would make less with the belt drive and all the works.
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Old 07-28-2007, 09:20 PM   #33
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Yeah I know but it made good power and was easy and cheap .
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Old 07-28-2007, 11:05 PM   #34
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If you take enough time and spend enough sure you can make a 305 make power, if that's what you want to do.

305's are not the ideal choice but if you really want 500-600 hp out of it stroke to make a 331 or 335 or whatever it is with the 4 inch stroke, make sure it's forged. Build it for spray. Get the best heads, you can and a good cam for spray. Spray it with say a 300 shot.

I think you can get 600 that way.

3rd Gen's just beg for an LS1 instead of a 305...
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Old 07-30-2007, 02:58 PM   #35
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Quote:
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I am going to build this **** out of it, but is 305ci just to little to get lots of power, or not a problem.
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Old 03-15-2008, 02:44 PM   #36
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Hey since no one is posting in my other thread i'll rectify this one. I am taking your guys advice.

I can buy a 400sb for 250 or a 454bb for 300 what should i buy. personally i want the big block but i can be persuaded to a high reving small block
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Old 03-18-2008, 02:34 PM   #37
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I would go big block, they are cheap as small blocks and 500-600 hp can be done with mostly stock parts. I know the feeling of high reving sb, but there is nothing like tipping into the throttle of a BB and roasting the hides at a rolling 30 mph.

A 454, with the stock oval port heads, an intake, a carb, and 10.1 pistons, a lumpy cam, and a tourgue converter will yeild 400+rwhp. But your limitied to a 6500 redline.

Building a high reving SB will yeild the power you need, but above 7000, you will eat valve springs like toliet paper in a ladies room. Unless you buy revkits ($400 with no power added)

I have built plenty of nasty 305's and they ran like a raped ape, but 475hp is usally the most out of a 305, you have to remember 305 blocks are 2 bolt and the caps walk like a 3 legged dog.

Big Blocks can produce 600hp without breathing hard, a small block you have to wind it to the moon to get 600hp.

Just my opinion.
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Old 03-18-2008, 05:49 PM   #38
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if you wanna spend some money on the 305 to make it go fast, it isnt worth it. Just go with a LSx engine, if thats too much for you(its good since its also light and compact) but if its too much, I woulndt go with a 305. I in fact have a 305 in my drontyard, painted orange. It has a cracked cylinder and can be resleeved. I would never use it in a car though... 305s all around arent good from what Ive seen. I dont know if its identical to a regula SBC, just teh block itself, but from what my understanding is... it isnt.
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Old 03-18-2008, 07:06 PM   #39
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I really think a big block is what i want. I found a kit to make an all forged 540CI for 2k. I can have all machining done for free. What does that sound like? I can have a forged 540 for 2,300 incluiding cost of engine, parts, and labor(by me). And then i was thinking about buying a 6speed from an lt1 car and throwin in a 12 bolt, or a 9 inch with 4.10s
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Old 03-18-2008, 08:25 PM   #40
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The end result is..."Well, if i did a 350...i would have 60-75 more HP....."


In all realitiy, there is no reason not to build a 383.
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Old 03-18-2008, 08:25 PM
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