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Old 04-12-2014, 05:37 PM
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Vortec 5.7 stroker

I am installing a 5.7 Vortec stroker in the 41 Chevy. I am using the serpentine set up with a REFVERSE FLOW PUMP. I noticed the block, where the water pump mounts, ....has the lower hole on the passenger side blocked off. Why?

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Last edited by mrc013; 04-12-2014 at 05:38 PM. Reason: Clarify location of hole.
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Old 04-12-2014, 07:44 PM
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That area is not covered by the water pump on Vortec engines. The vortec engines bypass via a hose from the water pump to intake manifold.
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Old 04-13-2014, 06:19 AM
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Curious as to exactly what a Vortec 5.7 stroker is?
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Old 04-13-2014, 06:29 AM
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I assume he has a 350 Vortec block and installed a stroker crank, of course that would not make it a 5.7 anymore.
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Old 04-13-2014, 07:18 AM
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I'm assuming the same,but,after yesterday,IDK.Saw a guy @ Super Chevy yesterday tryin to sell a "355 Stroker".I asked him about the combo.He said it was 350 bored & stroked to 355 cu in.LOL.Somebody went home with it becuz it was gone when I went back by.
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Old 04-13-2014, 07:29 PM
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This would be a little oddball, but a 350 with a 3.5" stroke crank (.02 stroked) with a 4.020" bore (.020" bored) would make a 355 that's "stroked and bored"! I've thought it might be a good idea to use a 3.5" "stroker" crank so the block would only need to be decked .005" to zero deck a standard compression height piston. With a .030" overbore for much better piston availability you would have a 357.
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Old 04-14-2014, 10:18 AM
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Quote:
Originally Posted by mrc013 View Post
I am installing a 5.7 Vortec stroker in the 41 Chevy. I am using the serpentine set up with a REFVERSE FLOW PUMP. I noticed the block, where the water pump mounts, ....has the lower hole on the passenger side blocked off. Why?
The original clockwise rotation pump tends to favor volume output on the passenger side of the block. The small hole is intended to be a bleed back to the intake side of the pump to balance up the flow to that of the dirvers side. It's really too small to be effective at engine speeds beyond cruise so it never provided the help where such a flow difference is a problem in the higher RPM ranges. For years the racers basically blocked about 1/3 to 1/2 the passage diameter between the pump and block passages which goes to show you how big the problem can get at continious racing speeds on long tracks.

The reverse rotation pump with the OEM style serpentine belt moves the excess flow issue to the drivers side where there is no bypass hole. But in a fit of wisdom! GM's new generation of engineers realized the original bypass was ineffective and the engines ran fine on the street so there was no need to duplicate the bypass on the drivers side and at worst there was a negative value in keeping it on the passenger side with the reverse rotation pump. So they simply pluged the hole. Simply cheaper than developing a new casting for the pump or changing tooling for the block.

Bogie
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