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Old 11-28-2004, 09:46 PM
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destroking a 350

Hello, I'm looking to build a high-reving chevy. I'm unfamiliar with gm engines being the ford man that i am, could i use a 305 crank in a 350? if so what mods would be needed? and what kind advantage if any could be gained?

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Old 11-28-2004, 09:52 PM
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305 and 350 Chevy cranks are the same stroke
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Old 11-28-2004, 09:56 PM
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most modern smallblocks are 4" bore. You could build a chevy 302, 4 inch bore, 3 inch stroke. Or a 327, these are good rapping motors. You could just build a large journal 327. You'll get a decent amount of cubes, a strong steel crank and good rev ability.

K
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Old 11-28-2004, 10:02 PM
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Why not a 400 destroked with a 327 crank?
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Old 11-28-2004, 11:47 PM
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If you just want a high winding small block build a 302, those are about the highest winding small blocks out there. Of course you will have a hard time finding a true 302 (big money) so you could take a 283 crank and a 327 block and build your own. I am not sure why you would want to do this. The parts (pistons, rings, etc..) will be more expensive. I would much rather have a 377 (400 block with a 350 crank). More cubes about the same price (maybe less) and a LOT more power.

What are your plans for this engine? Why is RPM so important?

Royce
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Old 11-29-2004, 12:30 AM
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because...

I just wanna be different, and ive never built a chevy before. besides i've done a few ford 345 strokers, and think destrokin a chevy may be a nice change. rpms are very important becase i want the novelty of spinning a small block to around ten grand on the tach.

I just wanna be different, and ive never built a chevy before. besides i've done a few ford 345 strokers, and think destrokin a chevy may be a nice change. rpms are very important becase i want the novelty of spinning a small block to around ten grand on the tach.

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Old 11-29-2004, 08:25 AM
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cool. just be aware of what it takes to spin to 8000rpm let alone 9,000. at that level there wont be much reliability,and would be extremely costly


i have respect for people who spend 20 grand to go down the 1/4 miles 5 times(thats crappy mileage)

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Old 11-29-2004, 09:12 AM
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The old DZ302 would rev to 8,000RPM. If you are serious about trying to rev to 10,000RPM I think you better look into building a Honda or something. In all honestly reving a SBC to 10 grand is not realistic or wise. There is really no reason to do it. If you have VERY deep pockets you can make it happen. As mentioned by spinn it won't live very long.

Do you know what RPM stands for? RPM = Ruins Peoples Motors

Royce
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Old 11-29-2004, 04:49 PM
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Gonna be pretty spendy having to buy all those lightened parts.
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Old 11-29-2004, 05:26 PM
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I used to have a 350 with stock rods and ARP bolts. It turned 7000 rpm quite often. It seems to me that a 283 bored 60 (289ci?) with an oil cooler, good rods, bolts and forged pistons in the bottom and a 525" 1/2 mile circle cam and Vortec heads topping it off would turn 7500 on a regular basis.
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Old 11-29-2004, 05:27 PM
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yup

Yeah its gonna be expinsive, but i do have the means to build most of my own parts, so that wont be as costly as it could. and true there is no reason to do it, i just want the novelty of knowing i can do it. you'll never catch me sittin near a honda muchless building one.
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Old 11-29-2004, 07:55 PM
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hi revving engine

Just consider that when ever you go over the magic number of 6000 rpm, the cost starts getting serious. After 7000 rpm, for each 1000 rpm there after, the cost of the engine can just about double, that is if you want it to live.
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Old 11-29-2004, 09:11 PM
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305 Is Weak

The 305 crank is no good for serious revs. A 302 can rev 7,000+ rpm without excessively exotic parts, but revs are still expensive, valvetrain issues, etc.... An exotc 327 would rev quite excellent for a bit less money, with a solid lifter cam, etc....
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Old 11-30-2004, 08:41 PM
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If you can afford it,they make a 400 block with 350 size mains and splayed main caps,the true dz 302 also had 350 size mains,but unlike other small blocks,they had small journal rods all at a minor 3 inch stroke,I believe JE pistons makes the slugs to fit it all up. In my opinion,that would be the king of all revers in the small block class. You would also need one awesome valve train and some darn good rods,and a pan that holds about 10 gallons of oil"just kidding".

321 cubes

Last edited by rifraf; 11-30-2004 at 08:41 PM.
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Old 11-30-2004, 09:47 PM
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I have a 383 stroker with a cast crank, Eagle H-beam rods, SRP pistons, Crane circle track cam(4000-7200 rpm), Edelbrock Victor Jr. heads and intake with a 780 Race Demon carb. This engine spins 6500 regularly, dependably, and as a street motor. I built it for around $5000.
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