As above by zed1015 with number 1 and number 4 cylinders at TDC the number 1 cylinder lobes are facing
away from each other as are the cut-outs (notches) on the timing side end of the cams on number 4 cylinder when viewed from the right hand side of the motor.
At this time the lobes of number 4 cylinder are facing toward each other and the timing arrows of the exhaust camshaft and inlet cam shaft are facing away from each other too, fore and aft respectively.
There is a marked difference between the position of the arrows when exactly parallel to the head and the correct valve timing as set out in the manuals.
Similarly, with the arrows parallel to the head or as near as one tooth or the one next to it will allow,... the lobe centre method of measurement may be as much as one tooth or more out due to wear in different components of the valve train, valve clearances, deck heights and head skimming, gasket thickness's..... etc etc etc.
I found that mine is a tooth and a quarter out on the exhaust cam and a tooth and three quarters out on the inlet cam.
The fractions here are explained by adjustable cam sprockets!! and the discrepancy by a mish-mash of non standard parts barrels, pistons, head, cams and base gasket spacing etc.
In any event both arrows are fractionally above horizontal, the inlet being more so than the exhaust and this is not a set up for radical cam timing it differs from standard by only about three degrees.
Hope this helps.
AL
Edited to correct hideous error on my part
