Styln928

I'm looking for the stamp pad again. Save typing time by telling me any other place to look but over by the pass side cam cover. It's not there. Never was. It wasn't grinded down or torched. Nobody's that good. The spot where it should be is factory looking. PO told me the block was changed early in it's life. Any help here is greatly appreciated.

TIA

rixter

which car?

heinrich

Ron I believe when Porsche did factory replacements, they replaced with new blocks with NO number. As you know the block should be stamped to the right of the thermostat housing. Nothing wrong there. Just get the service record ..... dealer will have it.

Styln928

Rixter . . . It's the 83 Euro.

H . . . Thanks . . . No other place on the block to look?

rixter

Ron, sent you an email with pic

Vilhuer

Complete spare engine's at the factory had normal engine number. Have seen two reputedly factory repaired blocks (S and S4) and both have ATR stamping there. In S case ATR on top of normal number:



On main bearings were '87 dates so it has been open some time after that. By factory or someone else I don't know.

In S4 case only engine type and ATR:

Styln928

Rix . . . Thanks for the pic. No stamp pad there. Maybe some special engine Porsche had and put it in my 928 by mistake?


I took a shot

heinrich

I have seen a local one with no number, and his had been replaced early-on by the dealer. So .... I guess we're left guessing.

Jim bailey - 928 International

I believe replacement blocks are no numbers where factory replacement rebuilt engines were numbered AND marked ATR. The new 911 bare engine cases have no numbers.

Styln928

Thanks guys . . . Now I can put this to rest. Jim, would the install the right engine or something they had lying around?

Cameron

Ron,

I think that it is one of those 350 HP engines that was specially prepared for the Le Mans runs of '83 and '84. At least that is what you should tell everyone!

Jim bailey - 928 International

Ron depends on by whom and where the block was changed. If the block was done in Europe it probably got the Euro pistons however if the block and pistons were changed in the US by a dealer odds are they did not use the euro parts since the USA Porsche dealers would not order the euro spec parts. But you never know we have sold several Euro engines to replace blown up Euro motors as well as USA short blocks that they used the euro heads intake etc just lost a bit of compression/performance but had a running driving car again. The fact that the engine numbers are not there does raise questions about what block was used...then what pistons ?? take the car for a zero to 100mph test and time it or put it on a dyno to see how much power it makes.

DR

The 2 or 3 GTS factory Replacement Engines I have seen only had "M28/50" stamped on the block, no serial #. Those were complete engines so that may be different.

Jim bailey - 928 International

That is correct complete NEW factory engines will have the engine type stamped but no engine serial number. Porsche stamped in engine serial numbers when the engine was to be installed in a new car during assembly at the factory.

DR

I honestly think the Block # thing depended on if Hans or Frans was stamping bl0cks that day, Frans had a tendency to take a lot of "5 minute breaks" :-)

Seriously, these cars are mostly hand made, and as we all have seen in one way or another Porsche did not always stay consistent in a lot practices.