911SC Engine Serial Number & Model Question |
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911SC Engine Serial Number & Model Question |
Peeterabytes |
Apr 12 2024, 10:25 AM
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#1
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Newbie Group: Members Posts: 15 Joined: 4-August 23 From: DFW Member No.: 27,500 Region Association: None |
I have a 911SC 3.0 engine on my 914/6 and trying to determine correct intake manifold size for new 40 PMOs. The stamp for the engine model type is 930/10 which led me to believe it was an 80-83 RoW model. Which means the intake port should be 34mm. However when I measure the intake port it's 39mm.
So when I check the engine serial number, 6382839, according to some prior posts here the third digit means it was built in 1978. And that corresponds to the intake port corresponding to the 39mm listed in Bruce and Wayne's books for 1978 RoW 911SC engine. I think I'll go with what I measured but I find it very odd. Any of you experts have an idea of what is going on with this mismatch between the type and serial number? Thanks, Peter |
mepstein |
Apr 12 2024, 11:20 AM
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#2
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914-6 GT in waiting Group: Members Posts: 19,253 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Check the model number on the heads.
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sixnotfour |
Apr 12 2024, 07:26 PM
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#3
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914 Wizard Group: Members Posts: 10,418 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains |
What's the date on the heads ??
spec numbers are average, you have a 78/79 large port 3.0.. |
davep |
Apr 12 2024, 09:56 PM
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#4
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914 Historian Group: Benefactors Posts: 5,137 Joined: 13-October 03 From: Burford, ON, N0E 1A0 Member No.: 1,244 Region Association: Canada |
The 1978 & 1979 SC had Large Port Heads
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nditiz1 |
Apr 13 2024, 03:24 PM
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#5
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Senior Member Group: Members Posts: 1,180 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region |
46x39mm intakes with 46 pmo. You can do 40 pmo as well, but unfortunately they don't have an intake that matches. Looks like the biggest is 37mm
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Peeterabytes |
Apr 16 2024, 02:10 PM
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#6
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Newbie Group: Members Posts: 15 Joined: 4-August 23 From: DFW Member No.: 27,500 Region Association: None |
A couple of folks have said check the heads for date or serial number. Any pointers where these numbers might be located? I crawled around under the car but didn't find anything.
Also I am told that I must use the PMO intake manifolds versus the old ones used with the Webers. Can anyone confirm this is true? Again many thanks in advanced in helping me figure this out! |
burton73 |
Apr 16 2024, 06:37 PM
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#7
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burton73 Group: Members Posts: 3,510 Joined: 2-January 07 From: Los Angeles Member No.: 7,414 Region Association: Southern California |
Not sure if this will help.
Pictures of Eng. in my 6 with the 46 PMO's 1978 3.0 SC big-port base (case, crank, rods, oil pump) Custom JE Pistons, replated Nikasil cylinders, 9.8:1 New valves, 38/37 ports (stock) ARP head studs & rod bolts GE40 "Mod-S" cams PMO 46 carbs & manifolds JWE custom curve on SC distributor to match the carbs/cams 930 tensioners, idler arms--all rebuilt Otherwise just everything new or refinished, redone, rebuilt |
targa72e |
Apr 16 2024, 10:09 PM
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#8
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Member Group: Members Posts: 262 Joined: 11-September 16 From: colorado Member No.: 20,392 Region Association: None |
You cant see the casting year or number as its on the intake side and will be under the shroud. If the shroud is off you can see it above the cylinder. Since you have measured you know you have large port or they have been ported.
The big port engines (78-79 us an all ROW) use the 4R cis runner. The US small port heads use the 2R CIS runner. If you looking at installed engine with CIS on this will be the easiest to look at. john |
Peeterabytes |
Apr 19 2024, 11:32 AM
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#9
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Newbie Group: Members Posts: 15 Joined: 4-August 23 From: DFW Member No.: 27,500 Region Association: None |
Thank you all for your help! Much appreciated. I am taking the measurement at the intake on the sizing of my manifolds.
Appreciate all of the responses (IMG:style_emoticons/default/beerchug.gif) to all of you |
arbitrary |
Apr 20 2024, 12:23 AM
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#10
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Member Group: Members Posts: 81 Joined: 25-April 21 From: UK Member No.: 25,475 Region Association: None |
Can you double check the third digit of the engine number? By my reading of the PET for the SC a 930/10 engine should have a 1, a C or a D as the third character.
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