356B T5 engine rebuild question

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Doug McDonnell
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Re: 356B T5 engine rebuild question

#16 Post by Doug McDonnell »

+1 I used a newer aluminum cooler with my rebuild. My original cooler tested fine but was 55 years old.
1965 356C 2000 BMW 740i Sport 1967 Honda CL77 There is never enough time to do it right, but always enough time to do it over.

Marc Walz
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Re: 356B T5 engine rebuild question

#17 Post by Marc Walz »

Thanx guys for your advice, it’s really appreciated.

So after all your posts and a short chat with Doug, my engine specs and component list would look like this:

- Stock engine case
- Stock cranksfhaft
- Stock Zenith carbs with SC jets and venturi
- AA 1720cc big-bore-kit, iron cylinders and forged pistons (30 degrees)
- SC/912 cylinder heads
- Elgin cam 66509
- 123 ignition + converting the car to 12V
- Aluminum oilcooler, stock size

Any complains or other suggestions?

Another question to the 356/912 specialists here: Whats the different between cyclinder heads 616.104.301.02 and 616.104.301.03? Can I pair them? Pictures below. Could get this set for 300 bucks here in Germany, no cracks, no damage.

B7301E25-77C6-47E5-9E49-7BC5DEAA6AED.jpeg
3EA9C618-3EB5-494A-9DDD-A24DD34E1768.jpeg
ED91694D-5EED-45BF-8F43-082950090CF6.jpeg
1D0E0BE7-A433-49A1-8B14-9AFF8B503232.jpeg
A6BD0152-4C4A-4BFE-9C4E-680A9002CB1E.jpeg

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Vic Skirmants
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Re: 356B T5 engine rebuild question

#18 Post by Vic Skirmants »

No functional difference. The 03 head has the extra material so that the holes for the horizontal sheet metal don't go all the way through.
That's a very good price.

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Martin Benade
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Re: 356B T5 engine rebuild question

#19 Post by Martin Benade »

For your carbs you want C internals. The SC only came with Solexes.
Just guessing here, but since you’ll build approximately a high compression C engine maybe somebody could recommend appropriate jets to slightly richen the mixture. Or tell you that’s unnecessary.
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Mark Roth
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Re: 356B T5 engine rebuild question

#20 Post by Mark Roth »

I had bad luck with two sets of AA P&Cs. I finally went with Shasta P&Cs and an SC cam from Leonard with my stock C Zeniths. Carb rescue rebuilt the carbs and I finally went with a basic 123 distributor. No need for a Bluetooth unit for theft prevention as it is more likely a thief will tow the car rather than hot wire it. Also an aluminum cooler from Jacques. Very happy with the performance and sometimes I drive the car like I stole it.
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Marc Walz
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Re: 356B T5 engine rebuild question

#21 Post by Marc Walz »

Great help here, really appreciate it.

@Mark What jets and venturis did you run in your Zeniths? It‘s difficult to get parts for the Zenith here as all the major shops in Europe only sell new webers and no spare parts for Zeniths. Maybe I will contact carb rescue to buy jets and venturis.

So is the SC cam similar to the Elgin 66059? Seems quite difficult to order a cam from Elgin, since they don‘t have an online shop. You need to print out an order sheet which you have to fill out and send by regular mail. Guess it will takes quite a while when you order from Germany :) But an SC cam is quite easy to find here.

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Paul Lima
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Re: 356B T5 engine rebuild question

#22 Post by Paul Lima »

+1 on Shasta P&C. Much better product than AA. Plus, Leonard can help you through all the other choices so you get exactly what you want.

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Doug McDonnell
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Re: 356B T5 engine rebuild question

#23 Post by Doug McDonnell »

Can you find a C cam in Germany? I think you can just call on the phone and order from Elgin. Cliff Murray gives a very logical discussion about C vs SC for street use here: viewtopic.php?f=14&t=43464&p=284131&hil ... ft#p284131 The Camshaft I used is very close to the Spec that The Maestro Harry Pellow always recommended.
Last edited by Doug McDonnell on Sun Jul 31, 2022 10:22 am, edited 1 time in total.
1965 356C 2000 BMW 740i Sport 1967 Honda CL77 There is never enough time to do it right, but always enough time to do it over.

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Martin Benade
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Re: 356B T5 engine rebuild question

#24 Post by Martin Benade »

A C cam will be torquier, the SC one is the same as an S used. Depending on your driving style you might prefer one over the other.
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Doug McDonnell
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Re: 356B T5 engine rebuild question

#25 Post by Doug McDonnell »

He wants more torque in the lower and mid range (mentioned in his 1st post) Porsche's final development for that was the C spec engine.
1965 356C 2000 BMW 740i Sport 1967 Honda CL77 There is never enough time to do it right, but always enough time to do it over.

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Re: 356B T5 engine rebuild question

#26 Post by Marc Walz »

OK, so I will call Elign tomorrow and see how it goes. Otherwise I will buy a C cam here, seems a few shops have them for sale.

@Doug: You mentioned one of the heads needs to be pluged because it has a hole with a thread. Is this hole visible on the photos I‘ve posted?

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Doug McDonnell
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Re: 356B T5 engine rebuild question

#27 Post by Doug McDonnell »

You can see it in this link with photos from Greg Bryan viewtopic.php?f=1&t=54474&p=412358&hili ... ad#p412358
1965 356C 2000 BMW 740i Sport 1967 Honda CL77 There is never enough time to do it right, but always enough time to do it over.

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Re: 356B T5 engine rebuild question

#28 Post by Marc Walz »

Ah OK I see, and that is the „plug“, right?

4A67C7FE-F29A-4E70-BD43-91EA5CFE3520.jpeg

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Martin Benade
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Re: 356B T5 engine rebuild question

#29 Post by Martin Benade »

My heads have Allen versions of that. And don’t forget to get the rubber with metal fillers for the breather holes too.
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David Jones
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Re: 356B T5 engine rebuild question

#30 Post by David Jones »

Marc, you may want to do a more general search for your Zenith parts. Here is an example of what is available over here. There must surely be vendors in Europe that cater to the used military vehicle market.
https://swissarmyvehicles.com/haflinger ... zenith-ndi
I have some extra parts I can spare, let me know exactly what you need and I will try and help.
If I had known I would live this long I would have pushed the envelope a little harder.
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