441 SBC head question - Chevelle Tech
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post #1 of 8 (permalink) Old Oct 26th, 03, 9:25 PM Thread Starter
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Steve
 
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I have a pair of 441's on an engine I got a few weeks ago, but they have the small seat tapered plugs. I didn't think the 441's ever had small seats, but rather the large seat plug with the gasket. Has anyone else seen these? The few books I have also say large seat. The heads are 1970 castings. Any input would be appreciated.

69 Malibu, 88 Camaro, 89 K1500 Z71 Stepside, 93 Z28, 97 Z28, 05 2500HD 4x4.
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post #2 of 8 (permalink) Old Oct 28th, 03, 11:51 AM Thread Starter
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ttt

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post #3 of 8 (permalink) Old Oct 28th, 03, 12:09 PM
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“441” GM Cylinder Head Flow Data

Valve Size 1.94”/1.5”
Chamber Size 76cc
Intake Runner 155cc’s
Flow In./Ex. @

.100” 55/45
.200” 110/83
.300” 160/118
.400” 194/133
.500” 201/146
.600” 203/148

1/4 of 1.94” = .485”
1/4 of 1.5” = .375”

"441" – 3932441. This head was found on the 1969-1970 350 engines (255hp 350), it was a decent flowing large chamber head. It had 1.94/1.50" valves, 76CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 61CC's. Not to be confused with 3923441, which was a 1.72/1.50" valve, 327 truck head.
Port Volume In./Ex. 155/62
.400” 194/133 68.56% 399.1hp
Average In./Ex. 1.252NA
Lift
.050” 30/22
.100” 55/45
.200” 110/80
.300” 160/112
.400” 194/127
.500” 201/136
.600” 203/139

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post #4 of 8 (permalink) Old Oct 28th, 03, 12:09 PM
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Steve,

It has been a few years, but if I remeber correctly the 441's I had on my stock car motor had peanut plugs also. I can't tell you the year of the castings, but the were for sure 441's.

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post #5 of 8 (permalink) Old Oct 28th, 03, 1:44 PM Thread Starter
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Steve
 
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Thanks. I have a few pair, and hey all have the large seat plugs, and I thought it was odd these didn't.
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post #6 of 8 (permalink) Old Oct 28th, 03, 3:40 PM
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I have a pair out in the shed, peanut plug.

The year a head is cast is not necessarily the same model year it's machined for. Sometimes they sat around awhile.

Tom

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post #7 of 8 (permalink) Old Oct 28th, 03, 6:50 PM
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NHRA stock/super stock racers will pay well for those castings if they havent been chopped up. Could be worth pretty good bucks!

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post #8 of 8 (permalink) Old Oct 29th, 03, 9:24 PM
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If the casting date is after Aug 70 (letter H for Aug in the date code), then they went into a 71 model car which got the taper seat plug.

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