Stroke/Destroke?
Thread Starter
Le Mans Master
Joined: Oct 2001
Posts: 6,925
Likes: 0
From: Paradise City
Stroke/Destroke?
This is hypothetical, but I'm dying to know. I have a 283 crank, and I'm wondering about different block/crankshaft combinations. I know you destroke a 327 w/ a 283 to get a 302, but what if you put a 283 crank in a 350 or a 400? I was "thinking" of doing a high spinning de-stroker for a friends '69 Camaro. I was thinking Edelbrock Victor Heads and Intake, w/ those trick Jesel Shaft mounted rockers, maybe a good head job to boot, w/ fairly high compession (for pump gas). Any thoughts? (how about HP/Torque figures?)Thanks! :cheers:
Race Director
Joined: Oct 2000
Posts: 14,997
Likes: 79
From: central FL, near the beach.
Re: Stroke/Destroke? (79Corvette02)
you could get a custom crank, 120 cubes, and try to qualify at Indy!
An interesting thought, what is the minimun cubes to make a SB Chevy? Will it run with 98? 68? 28? 8? .8? .064? :crazy:
An interesting thought, what is the minimun cubes to make a SB Chevy? Will it run with 98? 68? 28? 8? .8? .064? :crazy:
Racer
Joined: Jan 2002
Posts: 440
Likes: 2
From: Smithfield NC
Re: Stroke/Destroke? (79Corvette02)
I too have a 283 sitting around and have planned on building a 302.Just remeber to use a small jornal crank 327 block.Here is the equation for determining cubic inches.borexborexstrokex.7854x8=cubic inches.
I don't have the stroke of the 283 infront of me. Good luck and keep us posted on how it comes out.
I don't have the stroke of the 283 infront of me. Good luck and keep us posted on how it comes out.
Safety Car
Joined: Aug 2000
Posts: 3,711
Likes: 43
From: San Antonio TX
Re: Stroke/Destroke? (blackLS1)
If you de-stroke any 4.0" bore block(327 or 350) with the 283/302s 3.0" stroke, you'll get a 302. You can't do this trick with a 350 block because there are no small-journal 350s, but you can with a small-journal 327 block. Be aware, though, that the Z/28 3.0" stroke crank is not any kind of 283 crank even though most 283 cranks were forged.
Burning Brakes
Joined: Oct 2000
Posts: 936
Likes: 0
From: Chicago Illinois
Re: Stroke/Destroke? (79Corvette02)
That would be fun as hell but if you want good street manners and/or a fast car that is the impractical way of doing it. It will idle poor with bad vacuum, get bad gas mileage, foul out plugs and eat up valve springs to make as much power as you could have made with a streetable stroker 383-391+ on the same budget. Unless you were thinking of a milder setup, 400-425 horses. But I don't deny it would be fun as hell! But how about a high revving 383?
Rob
Rob
Thread Starter
Le Mans Master
Joined: Oct 2001
Posts: 6,925
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From: Paradise City
Re: Stroke/Destroke? (79Corvette02)
Is it possible to have a high revving 383? I mean,the stroke is already enormous, and the reciprocating mass is heavy so it must self destruct itself, right? If not, what would you have to do to make it stable at say, 6000 RPM+? :eek:
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Instructor
Joined: Dec 2001
Posts: 113
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From: Grand Rapids MI
Re: Stroke/Destroke? (79Corvette02)
I agree with Rob. I built a 388 (.060 over) for $3500 and it will run 6000 rpm all day. With the addition of the centrifugal supercharger, I now have the rev limiter set to 7000 and have been there many, many times. :)
Matt
Matt
Instructor
Joined: Dec 2001
Posts: 113
Likes: 0
From: Grand Rapids MI
Re: Stroke/Destroke? (79Corvette02)
I would say that there is no reason to ever destroke unless you are limited to a certain displacement for a race class or you are trying to achieve maximum hp/cu inch for some other reason. For the street, the 383 is tough to beat as far as bang for the buck.
Matt
Matt
