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Old 02-01-2006, 11:49 AM
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strocked 305 400 crank ideas????

alright yes i know what you are all going to say .... why not just find a 350 and stroke it to a 377 or 383??? well i though about that alot but dealing with what i have and of course a smaller budget im tryin this. i have a 305 from a 80-84 gm truck, i also have the 305 tbi that came stock. the truck engine i have completly broken down and i need my car now to drive so im going to build up that 305 use some parts from my engine in the car but this is whats goin on the truck 305 650 road demon air gap intake, spacer ,cam around .450 .460 lift,and an eagle crank, steel rods, and pistons around 9.5 to 1 comp havent decided about the heads yet weither i want to port the stock one's or get world products sr tq heads all new valvetrain but heres the thing i would like to put a 400 crank in it to get that extra tq . i dont want to run the engine much past 5000 rpm so thats why i want to fit the 400 crank in it. i think it should be around 285 to 310 hp and with the 400 crank it should be at least 400tq i hope. so any ideas thoughts or even just tell me im stupid thats alright i thank all that share thier ideas. t hank you
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Old 02-01-2006, 01:11 PM
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Too much trouble and money for too little return.....IMHO.

The 3.75 stroke crank hits places in the 305 block. It can be ground out but is a lot of grinding......and you only gain .270 stroke.....
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Old 02-01-2006, 04:16 PM
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Not to mention way too little bores to support any decent flow. Bore/stroke ratio will be even worse than a stock 305.

You can do it and I urge you to do what you wish, but it will be 6 times the cash and nowhere near the power potential of a 350.
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Old 02-01-2006, 04:50 PM
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Finding pistons for a 3.75 stroke in a 305 are probably going to be a lot more expensive than those for a 383. It really wouldnt cost you any more and 350s are all over the place.
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Old 02-01-2006, 05:01 PM
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Quote:
Originally Posted by Blazin72
Finding pistons for a 3.75 stroke in a 305 are probably going to be a lot more expensive than those for a 383. It really wouldnt cost you any more and 350s are all over the place.
if he used a stock 400 rod he could use off the shelf pistons for a 305. i have to agree, i would put it in a 350 block. their pretty cheap these days. hell you can just about get one give to you if you have the right Friend needing it out of their way.
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Old 02-01-2006, 05:07 PM
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I've seen it done, I don't have my library with me right now but I know I have a mag article on the 330-something cube 305 stroker.
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Old 01-03-2008, 11:50 PM
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334 stroker

Yes you can put a 3.75" stroke 400 crank into a 305. Find a used 400 crank have the mains turned down to 2.45" and use the 400 short 5.56 rods. The stock 400, 350 and 305 all have the same piston pin height at 1.56. By using the short rods you can use stock 305 pistons and the increased stroke results in 334 CID. Also KB makes numerous pistons in different compression ratios for this combination. Yes, there is a small amount of grinding on the block for the crank counterweights and rods when using this crank in a 305 block.
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Old 01-04-2008, 09:47 AM
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Quote:
Originally Posted by 406 ss monte
if he used a stock 400 rod he could use off the shelf pistons for a 305. i have to agree, i would put it in a 350 block. their pretty cheap these days. hell you can just about get one give to you if you have the right Friend needing it out of their way.
If you mean OEM-style replacement pistons, they probably won't work. The piston skirts will hit the counterweights. Keith Black makes pistons specific for this build.

I don't think this build is such a bad idea.

tom
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Old 01-04-2008, 12:00 PM
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When you can buy a Running 350 for $100-$200 I cant see how you would be saving money. Then your going to have to find a 400 crank and have it machined for 305 mains, again not cheap and you only end up with a 334. If your really interested in doing it there's some more info at http://www.cadvision.com/blanchas/54pontiac/305.html It also has to be externally balanced, again adding to the parts list you will have to buy.

With that small of cam you could use stock Vortec heads, and gain 20-30 HP. Check out Craigslist and Ebay for some good re builders.

Good Luck
Jordon
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Old 01-04-2008, 05:55 PM
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305 stroker

This is just FYI. The reason the 305 stroker even came about was because of the problems "car guys",especially in CALIFORNIA, were/are having. One of the things is that inspection folks check for is original engines. On 305's there are large raised 305 numbers cast in the block. You can't change cheat and switch the engine to a "larger" one, and you're limited on how far you can bore a 305, so what else do you do? The same thing that was done with the 350 stroker. ( CAR CRAFT MAGAZINE article "Inching Up" Dec. 1993 by Marlan Davis.). The carbed motor was good for 330 H.P./378F.P.T.;TPI setup 302 H.P./388F.P.T.
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Old 01-04-2008, 06:26 PM
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strocked 305 400 crank ideas????

I dont know about the rest of North America,but I can tell you for certain that 350's are not very easy to find.Most are in cars that go to the crushers.Around here,305's are starting to get scarce.Maybe some guys have no option but to use a 305.
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