The last 1300cc F engines were Dual Port?

[Luca5387]

Hello everybody,
this morning I started to work on an engine for a customer, a 1.3cc dual port with AS41 block.
While I was working on it something strange went to my eyes: the block is stamped "F".
At first I tought it was a reconditioned engine but then I also noticed that the numbers and the vw logo were present and seemed original:

After that I checked here on the samba, looking at the tabs the "F" engine production ceased in July 1970 after 2.140,820 units.
So my engine is very close to the end of production, merely 3000 units to the end.
Strange because F engine should have: single port, single pressure valve and not built on AS41 blocks.
It is a full finished double port engine, with the aluminum radiator, doghouse, three pieces intake etc etc.
So what do I have here? Being so close to the end of production it is possible that vw already made the new version and started to sell it marked "F" for the last units and then change the name in august with the new model year?

I wonder if the last "B" engines were the same and when exactly they started to make the dual port engines.

Does any one of you have a 1970 beetle to see other engines like that?

cheers
_________________
Italian 1964 "ruby red cocaine bug"
1960 ragtop artic patina

Insta: OCV5387
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[bnam]

Dual relief valve was introduced in 1970. So it is possible that your engine was originally single port but dual relief valve and later rebuilt as a dual port.
_________________
1971 1302LS Convertible (RHD) owned since '74
Click to view image
1965 Karmann Ghia Coupe - under restoration
1966 Fiat 1500 Cabrio (with 1600 Twin cam)
1952 Citroen TA 11BL

[Root_Werks]

Back in the 80's I had a 1500SP I tossed DP heads on. I don't remember swapping out P/C's. Would putting stock DP heads on a 1300 be possible?
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When I set my timing, why do I flush, then take a pee?

[heimlich]

You are in Italy. That was one of the countries where you didn't get anything larger than a 1300CC engine without paying a special tax. I imagine you will find a lot of 1300CC dual port engines there.

As for the engine discrepancy, you will need to look further. There has to be documents somewhere.
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[ashman40]

From this page on engine numbering:

[heimlich]

I'd be interested to see what else is in that engine especially if it is stock and never been apart before.

Does your engine have flat pistons or the dome top ones?
_________________
www.vwnos.com [email protected]
Classic Brands. Classic Quality.
Not all parts are made the same. NOS OE/OEM parts made mainly in West Germany, Early Germany, and Early Brazil are where VW produced the best quality parts and best fitting products.
5% Off your order with coupon code: 5%OFF
Restored Distributors Available (<--Click here)

[Zebedee]

My March 1970 still has its original F code 1300 and its a dual relief case. Not sure if its an AS21 or AS41 case though.

The 1969 F code engine i bought for parts was a single relief case one, though only a few hundred digits older
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If you do things right, people won't be sure you've done anything at all.

[KTPhil]

[glutamodo]

One thing about the numbering system for serial numbers for upright Beetle engines for German made production line vehicles:

Single port were always one letter and 7 digits
Dual port were always two letters and 6 digits.

(type 3s got dual port before this numbering system change, so they werelsingle letter plus 7 digits)

The parts manual clearly shows the start of dual port heads at AB 000001 and AC 000001.

_________________
Andy T.

"What is Glutamodo, Horror of Toyko, besides total, fiendish, quality-a-you brain!"

[Luca5387]

[Luca5387]

[Luca5387]

[Luca5387]