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Holley question, not Corvette

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Old Apr 2, 2009 | 03:39 AM
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Default Holley question, not Corvette

Was looking at a very badly cloned 1970 Nova SS396 today,and saw that the holley had a little flapper valve on the top of primary float bowl.

Valve was open most of the time, but flooring the throttle made the linkage close the valve.

What on earth was the purpose of this?

Seems to me like a fire waiting to happen,a nd with the valve open when engine stopped, gasoline just will evap out thru the hole.

Doug
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Old Apr 2, 2009 | 08:01 AM
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What you saw was a bowl vent on an earlier Holley. Maybe '66 back. Gas will come out there if the float sticks.

A '70 Nova 396 came with a Quadra-Jet on it.
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Old Apr 2, 2009 | 08:31 AM
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Default What about the 375 HP motor

Originally Posted by MikeM
What you saw was a bowl vent on an earlier Holley. Maybe '66 back. Gas will come out there if the float sticks.

A '70 Nova 396 came with a Quadra-Jet on it.
I think that the 396, really a 402 in 70, with the 375 HP option was a holley 780 cfm carb.

Even though the cars wore the 396 emblems, they had a 402 in them.
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Old Apr 2, 2009 | 12:04 PM
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Yes, it would have been a 402.

Get this:

The trim tag, which has signs of being removed and replaced, has a build code of 03C, whicH I believe is 3rd week, march.

The mtor which has the correct block and head castings, are dated Jan4 70 on the block, and Jan 17, 1970 on the heads. Too early for the car.
, and really, the heads and block are to far apart, IMO, but I suppose 2 weeks is possible.

The stamp pad was simply ground down with a grinder and restamped, T0317CKO, March 17.

Now for the coup d gras. The distributor, which is date coded 0C17, March 17, 1970 has a code number 1112002 that says is was originally from a 350/250HP Nova.

Now, what do you think the coincidence is that some previous owner, just happened to accidentally stumble across a Nova SB distrib that has the same build date as the BB engine to replace the original distrib, for some reason?

They took the time to sestamp the muncie, even though it has the wrong case, but they either forgot to deal with the distrib, or couldn't find a correct one and figured no one would notice.

Doug
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Old Apr 2, 2009 | 12:41 PM
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Default Vented float bowl

Originally Posted by AZDoug
Was looking at a very badly cloned 1970 Nova SS396 today,and saw that the holley had a little flapper valve on the top of primary float bowl.

Valve was open most of the time, but flooring the throttle made the linkage close the valve.

What on earth was the purpose of this?

Seems to me like a fire waiting to happen,a nd with the valve open when engine stopped, gasoline just will evap out thru the hole.

Doug
Doug, my old Rochester tri power carbs have a covered vent on the top of the bowl. This appears to have been a standard practice on some carbs.
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Old Apr 2, 2009 | 09:07 PM
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From: Frederick Md
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Originally Posted by AZDoug
Yes, it would have been a 402.

Get this:

The trim tag, which has signs of being removed and replaced, has a build code of 03C, whicH I believe is 3rd week, march.

The mtor which has the correct block and head castings, are dated Jan4 70 on the block, and Jan 17, 1970 on the heads. Too early for the car.
, and really, the heads and block are to far apart, IMO, but I suppose 2 weeks is possible.

The stamp pad was simply ground down with a grinder and restamped, T0317CKO, March 17.

Now for the coup d gras. The distributor, which is date coded 0C17, March 17, 1970 has a code number 1112002 that says is was originally from a 350/250HP Nova.

Now, what do you think the coincidence is that some previous owner, just happened to accidentally stumble across a Nova SB distrib that has the same build date as the BB engine to replace the original distrib, for some reason?

They took the time to sestamp the muncie, even though it has the wrong case, but they either forgot to deal with the distrib, or couldn't find a correct one and figured no one would notice.

Doug
I found one of these carbs on Fleabay, this guy is sick with the price.

List 4491 is a 780.

http://cgi.ebay.com/ebaymotors/1970-...ayphotohosting
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