porsche 928 RI

Just wondering if there was a simple way to tell the difference between the 4.5L or 4.7L Engine ?

Jadz928

Cross reference here:

Look here:

porsche 928 RI

thanks alot, that has stumpd me for a coulp of month's!!

danilz

Does anyone have a valid link. The link above doesn't work. Problem is my engine number has been tampered with so I need to find out or tell the difference between the 2 engines. Mine is a K-Jet

karl ruiter

Somewhere there is a picture of all the different piston tops. If you could find that you might be able to look at the pistons with a boroscope. I don't think block, heads or cam carriers used different casting numbers, but not totally sure about that.

GregBBRD

Finding out what year the block was cast might get you close to knowing 4.5 or 4.7.
There's dated casting information on the back of the block.
You will need to remove the flywheel to see it...

Mark Anderson

Look at the head casting numbers in the valley. 346 is 4.5 348 is 4.7

danilz

Thanks you guys, planning to drop the transmission soon. Will inspect it