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Old 09-20-2010, 05:09 PM
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SBC 355 Build

I'm currently building a sbc 355 2-bolt main with new 4 valve relief flat-top pistons. Re-conditioned rod and crank. All new bearings. Isky 201292 cam. GM Phase 6 Aluminum Bowtie Heads. MSD HEI Ready to run distributor. 1.6 Roller rockers.... When it came down to my intake my friend had a (Dual Plane) aluminum bowtie intake that will bolt right up to it. It's casting numbers are 14044838. Wondering if anyone knows the rpm range on it. Any helpful tips will be appreciated

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Old 09-20-2010, 05:24 PM
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I don't know for sure but i would guess idle- 5500.
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Old 09-20-2010, 05:26 PM
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Idle or peak RPM ?
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Old 09-20-2010, 05:36 PM
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What? Idle speed to about 5500 rpm is most likely the rpm range for that manifold.
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Old 09-20-2010, 06:09 PM
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Being an 8-digit casting number, I'm pretty sure it's a replacement intake for the earlier Z28/LT1 intake from '68-'70.
The Edelbrock Performer RPM and the Weiand Stealth are said to have been patterned after this design. Good for 1500 to 6500, this manifold consistently shows the best hp and torque for a street or street/strip motor on my DynoSim program.
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Old 09-20-2010, 07:00 PM
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Thanks alot guys... I think I'll go ahead and try it since it has that wide performing range and I'm only using it for a street engine
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