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Old 11-06-2007, 02:32 PM
Mustangsaly's Avatar
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6" Rods in a 350

whats everyones opinion on a 6" rod 350 ? what's the advantages & disadvantages of 6" rods in a 350 348 stroke ?

my plan is a SBC Build in the 6000RPM to 6500RPM Range, parts consist of a 350 roller block, Hyper pistons, GM Reconditioned I Beam Rods & GM Hot roller cam, Vortec Heads. 10.1 CR. the Dyno shows this setup (with 5.7 Rods) to yield a Hot Little pump gas friendly 350. this is a street thumper that will see a couple sundays a month during the race season on the 1/4 mi drag strip.



Displacement: 355 cu. in.
Carburetor: Speed Demon 750 and a 1 1/2 in. spacer
Heads: GM L31 Vortec
Intake: Edelbrock Super Victor single plane
Camshaft: GMPP HOT hydraulic roller, with 0.525/0.525 in. of lift and 218�/228� of duration @ 0.050 in. of lift.
Exhaust: Hooker 1 5/8 in. headers with Flowmaster 2 1/2 mufflers
Pistons: stock
Rods: stock
Crank: GM
Ignition: Stinger electronic with MSD 6
Timing: 32�
Comp. Ratio: 9.75:1
MAX HP: 422 @ 5700
MAX Torque: 418 @ 5000

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Last edited by Mustangsaly; 11-06-2007 at 03:31 PM.
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Old 11-06-2007, 02:54 PM
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Use whatever rod length the piston of your choice dictates. Your fanny will not be able to tell the difference between the two. BTW, I think you are a little over the edge for stock rods.

tom
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Old 11-06-2007, 03:29 PM
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so far I've been conservative on what I spent on parts, my 062 vortec heads are salvage yard specials that were off a low mi engine that were maged for cracks. the heads & block have to visit a machine shop yet, I figured I was pushing the stock rods but, thought I was safe with arp fasteners and a reconditioned rod. I keep thinking GM did it on the vette and a couple other SBCs. but I know this 350 is no good if it comes apart. so what rod would you recommend ?


this is going in a 74 Camaro with a 4 speed and 373s posi in a 10bolt that has aftermarket axles and a auburn limited slip with a bearing support cover and the axle tubes are welded. this rear might be a weak link also, I'm guessing the weak links are gona show up though.





so theres no advantages to 6" rods in a 350 ? if theres no advantages the 5.7 is prob a good choice. KB had a piston in the 10.1 CR Range for 5.7 rod & a 6" rod with a 348 stroke for about the same price.


thanks
Tom
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Old 11-06-2007, 03:37 PM
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Use a dual plane RPM type manifold . You don't have near enough cam to use the flow and upper rpm of a Super Vic. You'll give up a lot lot lot of usable torque. Vortec motors are all about torque, not rpm. A single plane manifold will be a dud on this motor. A long connecting rod is not worth bothering with on this motor. The rpm range is not high enough.

The super vic vortec manifold is a high rpm racing manifold. 4000+rpm big race cam big compression ratio full ported heads with a big valve size, lots of rear gear and rpm.

Last edited by F-BIRD'88; 11-06-2007 at 03:51 PM.
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Old 11-06-2007, 04:21 PM
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We build a lot of engines and when ever we have the choice of going witha 6 inch rod over a 5.7 rod we choose the 6 inch every time, less cylinder wall friction more dwell time at TDC, lighter pistons and better results on the dyno.
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Old 11-06-2007, 05:24 PM
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This looks like a really good street motor. I strongly suggest you contact Demon to see what carb THEY recommend. My motor is much like yours and in talking to the BG tech here on Hotrodders, I got the distinct impression I was probably a little overcarbed. And my motor is a 383. If mine really was overcarbed, with my AFR heads and larger displacement, you will be for sure. The carb looks great on a Computer Dyno (DD or EA3) but all that's needed for carb tuning doesn't show up there. Barry Grant has the experts, their advice is free. I'd check it out.

Pat
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