ANY one ever build one of the long rod engines..... - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-07-2009, 08:41 PM
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348

Not exactly what you have in mind, but that is what a 348 chev had for specs. I'm thinking the rods are 6.135"-ala the Mk IV big block. (348 is Mk I).
These were heavier, obviously, being the first big block, but they ran real nice. Real nice. Torquey.

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  #17 (permalink)  
Old 11-08-2009, 04:48 AM
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I had never heard of this before,and I could have got a dozen or more 300 rods for nothing a couple years ago,darn.
Shane
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Old 11-08-2009, 05:46 AM
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Quote:
Originally Posted by Chevrolet4x4s
I had never heard of this before,and I could have got a dozen or more 300 rods for nothing a couple years ago,darn.
Shane
You can now buy aftermarket I-beam 6.125" Chevy SBC rods more inexpensively than you can rework old Ford 6 rods. The Ford 6 rod was the answer in the late 1980's/1990's because there was no cheap aftermarket rods at that time. Would be kind of dumb to use such a poor rod nowadays. There were also combo's that used the 6" Olds Diesel SB rods after some reworking. No one does that anymore either.
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Old 11-08-2009, 06:21 AM
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Carl do you find the longer rods better in all cases or mainly in restricted induction engines?
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Old 11-08-2009, 06:38 AM
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Quote:
Originally Posted by barnym17
Carl do you find the longer rods better in all cases or mainly in restricted induction engines?
We do see a differance with the 4 barrel engines as we see a flater torque curveand better HP at the higher end or the RPM scale comared to a 5.7 rod engines.
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Old 11-09-2009, 06:31 AM
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Thanks Carl.
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Old 07-20-2012, 11:34 PM
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I built the Hot Rod mag 400 block with 327 crank engine.
my variations were 10.5:1 compression , World heads with a larger runner then the 170, in the Hot Rod article.

My results were good. It was put in a 71 chevy 4X4 with 3.08 gears,and a 350 w/ shift kit. Unladen weight was 5200 lb. The engine requires 14 deg. initial advance to run decent. The cam was an rv truck cam. It ran with no problem with 82-87 octane. it would break the tires loose with little throttle position.
The pipes were twice as loud with the same headers a stock 350 engine. Man it is great having gray hair . The cops just shake thier heads when it was wound out.
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Old 07-21-2012, 09:35 AM
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350 cubic inch race engine making 400 hp?

long rods vs short rods? will it make a difference? sometimes,,, depends on rpm,combustion chamber,ie fast burn.fuel used ,piston dome shape, head material,,so basically everything.
The piston goes to the top of the bore,stops,reverses direction and stops then does it over and over.The piston accellerates from stop to, w/e,then decellerates.there fore the speeds in the bore are different rates depending on where in the bore the piston is atm. A short rod and long rod have slightly different angles just after tdc so the excelleration rates will be different for each piston. The flame propagation will be different from one head to another,fuel burn rate different,and many other factors. Many engineers coundnt form a mathematical formula for every situation.
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Old 07-21-2012, 09:59 AM
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WOW up from the dead!!
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