Fresh std morris 15/40w for first run up, whilst checked over for leaks etc ect. then dropped straight away, and more 15/40 refilled.

Idle set at 1500 rpm whilst running in, and afr about 14.0 - 14.5

Then first 150miles easy below 3000 rpm. and once again AFR 14.0-14.5 whilst driving

between 150-350 miles use it harder, upto 4000 rpm. But not more than 1/4 throttle, and 0 boost. once again AFR 14.0 - 14.5

350 - 500 miles use harder again, upto 4500, half throttle and 5 psi boost.

Oil and filter changed to normal Fully if cossie, Semi if CVH.
Nuts and bolts all checked.

Next 500miles car used as normal, but on low boost, Cvh 10psi, Cossie 15-20psi, And reved fully.

Once again oil change, and full check over.

Now full boost.



I hear of 1000 miles of running in of 3000 rpm, and believe its pointless, as the engine wont bed in propertly.
A engine needs to be loaded up, and revs need to change for it to run in well.

That and a well built engine, will see good starter Compressions, (matters on C/r also) and different comp tester read different if cheap or old.

i see 165-170 psi (with in 3psi over all bores) on both my 8.0:1 cossie engine, and my 7.9:1 cvh engine. After 500 miles, and dont change much at all after that.