Timing 3.5 v8

Hello all. Just trying to time my v8 on a s3. I'm wondering if the metal arrow timing marker that corresponds with timing marks on the pulley is irrelevant as it would have possibly been tthe marker for the original 2.5, four cylinder engine? If so how best to time the v8, by ear/trial and error?

Thanks a lot. P

For any photos of the pulley? Didn't realise they were the same pulley.

Hi
I mean the metal timing arrow thing could possibly be from the 2.5 petrol original, engine not the pulley itself.

The rover v8 should have timing marks on the timing cover. As long as the firing order is correct, I would recommend just adjusting the timing by feel, with a bit of experience it's better than a timing light in my opinion. Cheers

I wouldn't bother too much about timing marks, except as a guide with a timing light, as the correct setting for a new engine may not be so after years of wear 'n tear.

If ever I feel the need to alter the timing on my 3.5efi I do it the old fashioned way. Running on your chosen grade of petrol simply loosen the clamp bolt just enough to allow the dizzy to be turned by hand & drive enough miles for the engine to reach running temp. Find a stretch of road with an uphill incline & adjust the timing to the point where the engine pinks/pings if you floor the throttle, then repeat the same run whilst backing the dizzy off a fraction at a time until the pinging stops.