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#901 104 308 0R head casting number verification?
Can anybody please verify this cylinder Head casting number:
#901 104 308 0R Thank you, Anna |
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02-12-2004, 09:21 AM
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Yup -- that's a head casting number. You can't tell much more then that from it though.
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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02-12-2004, 10:05 AM
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 Oops -- my apology for the glip answer. Based on your PM and checking a little faster, I guess you are right, the casting numbers do seem to be model specific.Since 308-1R is the '69S I'm guessing that you might have a pre-69S head. What is the date on the casting? It will be in MM-YY format and inside an oval opposite of the casting numbers. Are the intake ports 36 mm across and the exhausts 35 mm across? Is it a single plug head? I'm sorry for the being a 
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman Last edited by jluetjen; 02-12-2004 at 10:43 AM.. |
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02-12-2004, 10:36 AM
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I bought these heads as 69S,
Seller gave the following measurements: Ports: I=36mm E=35mm Valve: I=45mm E=39mm date stamp is 5/68 The heads have injector holes I presume original??? meaning MFI The heads came with old paper tags reading:911S 42mm Intakes (which would be correct for pre 69 "S" w/ these port sizes I trust the seller who said the I-valves measured 45mm which would make them 69"S" Heads. I have not yet had a chance to measure the I-valves myself... Bruce Andeson's book shows a photo of a 69S head it is date stamped 12/68 #901 104 308 1R--- 69 "S" Right I passed on a set of 5 "S" heads photos of which showed date stamp 8/68 #901 104 308 1R--- 69 "S" Right So what are the heads I purchased? pre-69"S" heads w/ 42mm I-valve, modified for MFI or 69"S" heads w/ 45mm I-valves as stated by seller But, have a casting number #901 104 308 0R When I measure the I-valves myself I guess I'll have the answer... I just wondered if anyone could give me an answer based on the casting number... I fear the worse of the two possibilities, but would be shocked by it... Thank you for any help you may give, Anna |
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02-12-2004, 11:09 AM
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I suspect that you have "Pre-69S" heads which have been modified for the later larger valve size. On the other hand, given a casting date of May '68 and "normal" industrial lead times, I could picture that they could be "69S" heads, just with an earlier casting because of some change that Porsche made along the way.
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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02-12-2004, 11:18 AM
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I wish I still had my 69S heads to confirm it but alas their gone. I'm pretty sure that my heads were stamped 68 as well but they were late in 68 (10 or 11)
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Tim 1973 911T 2005 VW GTI "Dave, hit the brakes, but don't look like your htting the brakes...what? I DON'T KNOW, BRAKE CASUAL!!!" dtw's thoughts after nearly rear ending a SHP officer |
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02-12-2004, 11:31 AM
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Yes, but Tim they found a good home...
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when you see hoof prints, dont automatically assume zebras |
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02-12-2004, 12:17 PM
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Yes they did.. I couldn't really use them and I'm glad they're going to get put to good use again. btw when were those heads cast?
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Tim 1973 911T 2005 VW GTI "Dave, hit the brakes, but don't look like your htting the brakes...what? I DON'T KNOW, BRAKE CASUAL!!!" dtw's thoughts after nearly rear ending a SHP officer |
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02-12-2004, 12:26 PM
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Does your casting number end with
"1R" or "0R" Anna? |
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02-12-2004, 12:33 PM
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Sorry folks, they're in storage in an ice-encrusted shed about five miles from here, waiting for warm weather to reignite my wrenching passion. Call me a fair weather shade tree hack if you must, but the wife kicked me off the kitchen table a few years back. (Probably shouldn't have filled her stock pot with carb dip)
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when you see hoof prints, dont automatically assume zebras |
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02-12-2004, 12:39 PM
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At least you didnt use the dishwasher to clean Porsche parts. Wives dont like that too much.
ASK ME HOW I KNOW!
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Chaos, panic and disorder . . . my work here is done Current Stable: Maserati GranTurismo S Range Rover Autobiography Various Porsches ~ in pieces |
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02-12-2004, 12:47 PM
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The old dishwasher trick.
My wife caught me at that pretty soon after we got married. I haven't washed a set in the new dishwasher though. All in all, it works pretty well. David Duffield |
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02-12-2004, 02:14 PM
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Anna,
Got a ruler you can put on the ports and valves? Should get you a good-enough measurement that you can put this to bed...(I'm crossing my fingers for you in hope of 45mm valves...)
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02-12-2004, 02:27 PM
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OK,
I'm about to bore some of you. Feel free to click over to another channel!!! I- Valves 45mm everything else checks out to 69"S: spec. Still though, the casting number thing??? Porsche must have just winged it I guess. Six heads, three date stamps (1) 4/68, (4) 5/68 all casting numbers ending w/ "0R" as the last two digits. (1) 8/68 the latest casting date of the group of six. It's casting numbers last two digits ("1R" = 69S) All six Heads are identical with one exception. The machined surface @ the point were the head gasket seals the head and the jug together. The machined surface on the one head with casting # ending in "1R" and dated 8/68 is broder like all 69 heads. All five remaining heads have a more narrow machined face, Like earlier heads... The 8/68-"1R" head agrees in all ways with all of the sources that I can check regarding 69S. The remaining five "0R" casting number have me stumped. I don't beleive the heads have been machined!!! But then again, I'm a novice here... Anna |
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02-12-2004, 10:14 PM
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Are your ports all the same? I seem to remember reading in BA's book that there were two sizes for 69S cars, presumably early and late. Just guessing here...
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when you see hoof prints, dont automatically assume zebras |
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02-13-2004, 03:30 AM
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BA list E- ports as 33/35mm I've wondered about this myself...
All measure 35mm including the 4/68 casting. One more thing about these heads, All of the I-valves I've ever seen are concave over about 75% of there face. These I-valves just have a small dimple in the center (for a lathe chuck?) like E-valves normally look. All Except the one 8/68 "1R" casting, it's I-valve has the concave area ??? |
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02-13-2004, 07:05 AM
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1969 Porsche 911E 2.0 E
1973 Porsche 911 2.4 MFI
