head and block machining specs

[toointoxicated60]

How much can be machined off the head and block before i start running into valves kissing the top of the pistons?


If the spec is in the Bentley please tell me where it is and i will gladly check myself.



Thank you.

[jlevie]

What engine you have is pretty important information.

[Cabriolet]

http://www.r3vlimited.com/board/showthread.php?t=245085

[toointoxicated60]

b25.

The link provided states the divots which i am aware of. But approximately how much must be machined off before the divots are completely machined away.

Also what about the block..

[jlevie]

How much you can take off the block depends on how much has been taken off the head and what cam is used.

[toointoxicated60]

stock b25 cam.

What is the maximum that can be removed in total before valves kiss pistons?

[jlevie]

The factory limit is the depth of the dimples in the head. That incorporates a safety factor and you can go a bit more. To find out how much further you can go on a particular engine you have to measure the clearance on all of the valves. That is commonly done with modeling clay on the valve relief cuts in the pistons. When doing this, remember that there will be some valve float.