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no steam holes for the street
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squeeezer
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Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Sat Jun 23, 2012 7:42 pm    Post subject: no steam holes for the street Reply with quote

406 sbc plugged steam holes in the blocks deck
I assume it will overheat on the street,and be fine at the track
I am right...........right?????

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Paul P
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Joined: 15 Aug 2002
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Location: Townsend, Mass.
81572.74 points


1971 Chevrolet Chevelle

PostPosted: Sat Jun 23, 2012 11:03 pm    Post subject: Reply with quote

Should be fine. Idling is where steam holes are really needed. When water is not flowing to quickly and pressure is low they build steam pockets but not are higher rpms so you are fine.
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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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squeeezer
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Joined: 02 Mar 2007
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Sun Jun 24, 2012 3:28 pm    Post subject: Reply with quote

When i rewired my car i added a circuit for an electric water pump.if i implement an electric water pump could i then "idle"????
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Mon Jun 25, 2012 12:02 am    Post subject: Reply with quote

Yeah you will be fine. Those holes are for street driven with crank driven water pump sitting in traffic.
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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Big Dave
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Joined: 04 Dec 2005
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Location: Tampa Florida
119973.02 points



PostPosted: Mon Jun 25, 2012 12:29 pm    Post subject: Reply with quote

A better solution in my opinion is a Stewart Stage III water pump with a CNC machined stainless steel impeller that moves three times the volume of water with half the horsepower required to turn a stock pump. The Stwewart is a true water pump designed to pump water the same way a Gould or a Wayne water pump is built with a machined aluminum housing containing the scroll and the previously described impeller to positively move water from the inlet to the outlet.

The stock water pump is half of a water wheel with nothing on the back to keep the water from recirculating inside the pump (an Edelebrock pump is similar to a stock pump only cast out of light weight aluminum with a fully enclosed squirrel cage water wheel for better flow at less parasitic loss of power). All a stock water pump does is to churn the water inside the pump and hope it beats it into submission.

Big Dave
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af2
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Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Mon Jun 25, 2012 6:31 pm    Post subject: Reply with quote

A water pump at 12lbs of pressure at X gpm is going to flow more than a water pump at 0 lbs no matter what pump you use. On a closed system, Correct?
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Mon Jun 25, 2012 9:17 pm    Post subject: Reply with quote

Adam,do you still have the steam holes in your 377????
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Mon Jun 25, 2012 10:24 pm    Post subject: Reply with quote

Yep, but the gasket and head has them plugged.
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Thu Jun 28, 2012 2:29 pm    Post subject: Reply with quote

how much idleing do you do?
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Thu Jun 28, 2012 4:04 pm    Post subject: Reply with quote

squeeezer wrote:
how much idleing do you do?


Forget my car, It idles at 1100 to 1200. The engine went from my 62 Willys PU to a friends 74 Chevy PU To the race car without the steam holes in the heads. We do live in the foothills of the Sierra Nevada and Idle time is not like living in a city. There is not many stoplights.
If you have a cam that idles at 700 or above you will never have a problem. Stock was around 500 and therefore had minimal flow at idle and the reason for purge holes.
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Skunkworkx
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Location: Harford Co. Maryland
10318.16 points


1968 Chevrolet Camaro

PostPosted: Thu Jun 28, 2012 9:16 pm    Post subject: Reply with quote

Mine were plugged also...4500 stall and not much idling at lights or stop signs...no slow ass parade driving.
No issues.

Now IF this will see any of that low RPM stuff....drill them.

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squeeezer
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Joined: 02 Mar 2007
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Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Thu Jul 05, 2012 12:05 pm    Post subject: Reply with quote

Decided to leave the plugs in the block.
the only time i see stop n go traffic is when car craft comes to the st paul fairgrounds for the summer nats.1 or two days a year.i can wait for the traffic to leave for that matter

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jeep_406
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Location: Tewksbury, Mass 01876
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1972 Chevrolet Nova

PostPosted: Thu Jul 12, 2012 1:39 am    Post subject: Reply with quote

I run a 408 that uses the Stewart pump, that Big Dave mentioned, plus a Griffin radiator with a couple of fans I bought from Skip White on E-bay. Even with an air conditioning condense in front of the radiator, the engine stays at 150 degrees as long as the fans are on. I run a 160 thermostat and run a 19 pound pressure cap. I can make a half dozen passes in an hour at the track with no rise in temp. The only reason I limit it to 6 passes is because the trans temp starts climbing.

I love the Stewart pump !!
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Skunkworkx
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1968 Chevrolet Camaro

PostPosted: Fri Feb 08, 2013 9:26 pm    Post subject: Reply with quote

Find the biggest tranny cooler you can fit and bypass the radiator completely. Really works for me...I don't think you can over cool an auto tranny in the 48 states.
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squeeezer
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Sun Feb 10, 2013 11:30 am    Post subject: Reply with quote

Already bypassed

Since this post....the block has a "full fill" it is possible still for me to street drive but my cooling system will be tested

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