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10-13-2002, 06:18 PM
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sbc questions??
Ok, bear with me here (I’m not a Chevy guru). My buddy has a 91 305 sbc that dearly needs rebuilt. Can you put a 350 crank in a 305? What would the displacement be? What about heads, what are my options? We’re working on a limited budget, about a $1000. Give me some ideas on what I can do, what type of cam would you recommend. We’re looking of an area of about 350+ horsepower.
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10-13-2002, 06:26 PM
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305 isnt a great motor to start with.
A 305 crank and a 350 crank are the same stroke, and in many cases, the same casting. Vortech L31 heads would be your best bet. I doubt 350 hp is taht easy on a 305
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10-13-2002, 06:27 PM
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The 305 your buddy has contains the exact same crank and rods of the 350. Crank is 3.48" stroke and rods are 5.7" length. Some are cast and others are forged. That is the only difference. As for 350 plus horsepower and the budget you have, a NOS set up is a possibility. The 305 with its 3.75" bore diameter is not a real player when it comes to building horsepower. You might consider a turbocharger of some type, and build it with low compression. If it is power you want, the easiest thing to do is get a larger displacement block. Your crank and rods with fit a 350 block so you only need a 350 block. Good luck....
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10-13-2002, 07:59 PM
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the 305 crank is balanced differently from the 350 crank although the casting #'s are the same. the small bore diameter of the 305 shrouds the intake valve, reducing breathing efficiency of the engine. any sbc heads with larger than 1.72 intake valves will hit the block with very much over stock lift due to the small bore diameter. your buddy would be better off to start with a 350 crate motor and make mods from there. use the 305 for a core.
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10-13-2002, 08:00 PM
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the 305 and 350 both have a 3.48 stroke.
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10-13-2002, 08:55 PM
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What about a 383 crank, will that fit in the 305 block?
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10-14-2002, 03:01 AM
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Noway, get a 350 block, with -----010 last three casting #s and build from there and use the 305 for a door stop!
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10-14-2002, 12:42 PM
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a 1,000 bucks willtake care of a normal rebuild. it may cost you 300 at the machine shop when you take your heads in.then another 135 for the type of cam you want(unless your a cheap scate).rocker arms are another 50 to 60 bucks. and the list keeps going. a 305 is a good daily driver motor and for fun on the street. it is not a drag motor.i have a 305 and it suits me fine for right now.if you want 300hp they are right get a 350. you can get 300 from a 305 but you better have alot of money. im not trying to discurage you,if you think you can pull off the 300hp then go for it.
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