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tyfighter123 · Joined: 19 Jan 2010 Posts: 551 Location: Colorado

I am wondering if the blocks are the same for a turbo and an N/A?
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Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

924RACR · Posted: Tue Oct 30, 2012 8:03 am Post subject:

Pretty close, enough to be fairly swappable, yes... but not identical.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

Yes. Close enough.
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Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

!tom · Posted: Tue Oct 30, 2012 3:53 pm Post subject:

What's the difference? Other than the number stamped into the block?
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78 924 NA
5-lug

peterld · Posted: Tue Oct 30, 2012 10:45 pm Post subject:

Not necessarily.......very early NA blocks had different sized crank thrust bearing, so not interchangeable with later models. All later (post 1978 ) blocks are near as damnit interchangeable.
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80/81 932/8 ROW

McGyver · Posted: Wed Oct 31, 2012 7:14 am Post subject:

They're interchangeable if you take block from 78-79 upwards than it can be used to build 931 engine. Mine block comes from n/a and I didn't noticed any changes other than breather output which is different but can be changed easily. So if you want to use 924 n/a block to build 931 engine all should be fine and without any problems (only that 76 blocks had another crank diameter so watch for that).
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931 82' - 5000km after full engine rebuild

SOLD: 924 81' N/A- with turbo gearbox "dogleg" - great but mysterious car

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