383 stroker question, 5.7 or 6.0 rods.
Thread Starter
Instructor
Joined: May 2000
Posts: 246
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From: NYC NY
383 stroker question, 5.7 or 6.0 rods.
I've noticed that most 383 stroker kits that feature internal balance have 6.0 rods and kits with external balance have 5.7 rods. Can anyoneexplain why?
Burning Brakes
Joined: Oct 2001
Posts: 1,033
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From: Tracy California
St. Jude Donor '05
Re: 383 stroker question, 5.7 or 6.0 rods. (lemans396)
I'm with Vette92!
The 6" rod may be a little better suited for higher RPM operation. Either way, it'll make good power.
KM
The 6" rod may be a little better suited for higher RPM operation. Either way, it'll make good power.
KM
Burning Brakes
Joined: Dec 2000
Posts: 1,023
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From: Marietta, South Carolina, USA
Re: 383 stroker question, 5.7 or 6.0 rods. (lemans396)
You dont have to use as much mallory when you internaly balance when you use a 6.0 rod, the more you can save on mallory the less it will cost you to have the engine balanced.
Jay
Jay
Safety Car
Joined: May 2002
Posts: 4,659
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From: Toronto ontario
Re: 383 stroker question, 5.7 or 6.0 rods. (RACER7088)
the 5.7 rod will actually flow more air in the lt1, which results in more power. usually the opoposite is the case. When using a 6.0 inch rod the rod keeps the piston at tdc longer, and at bdc longer, allowing more fill and more time for the mixture to burn, however, the time it takes moving from tdc to bdc is increases significantly (more piston speed) which can result in port stall (air cant move any faster), thats why most Lt1s actually lose power when built with 383s. Airflow research and GM both found the same thing, thats why LT1s come with 5.7 rods. =)
Le Mans Master
Joined: Oct 1999
Posts: 9,713
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From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Re: 383 stroker question, 5.7 or 6.0 rods. (5abivt)
thats why most Lt1s actually lose power when built with 383s.
That is the first I have ever heard of it being different for one specific engine, and I have never heard of anyone loosing power in a 383 because of using a 6" rod. The reason they used the 5.7" rod was because it will not cause as much wear as the 6" rod will. GM does not build them to get the most out of it, they build it so it does not come back to them. Pretty much the same reasoning LPE uses.
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Michael S. Palmer
Team Owner
Joined: Apr 2000
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From: CT
Re: 383 stroker question, 5.7 or 6.0 rods. (88-406)
My friend had a Lingenfelter 383(Similar to mine) with a cast 400 crank, 5.7" Pink rods and a set of hypereutectic 11:1s. It was a monster! You should be fine with either rod. I opted for the Oliver billet 4340 5.85" though they're overkill(I only shift between 58-6000)..it never hurts.
good luck,and you're REALLY going to like the 383!!! :yesnod:
good luck,and you're REALLY going to like the 383!!! :yesnod:
Le Mans Master
Joined: Oct 1999
Posts: 9,713
Likes: 3
From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Re: 383 stroker question, 5.7 or 6.0 rods. (88-406)
How much are pistons for the 5.7" rod?
I run 5.85" rods, but mine is a 396 (and I run Nitrous).
