valve to piston clerence @ TDC

[black_gst]

ok so my question is if the piston is at TDC and the valves are fully closed how much space is there between the valve and the piston im just looking for a bal park # because i know there are alot of variables such as over sized valve, valve relief's on pistons and machine work.

the reason for the question is im planing to replace the valve seals with the engine in the car and im wondering how far the valve will drop if i dont use compressed air to try and hold the valves up i have worked put a couple of 4g63 motors together and i think that even if i let the valve drop it will only fall about .125" maybe.

this engine has only 700 miles on it and i just did the hg for the second time because the cometic didnt seal up. so i really dont want to pull the head again

thanks

 

[BogusSVO]

well, you need to use compressed air, or the rope method.

the valve should fall enough that the stem will be lost down the guide. making getting the valve back up the guide a chore to say the lest.

 

[black_gst]

yeah i think i am gonna go with the rope method it seems safer then the compressed air deal

 

[Yngvar]

whats not safe about using compressed at a 100 psi you will need a hammer to knock it in

 

[Big Woo]

Yuo should be fine either way, I most always use the compressed air method, unless compressed air is not available.

 

[black_gst]

well i was just thinking i have to go compressed air. i dont want to redo timing so i was going to zip tie the cams gears to the t-belt and unbolt the cam gears from the cams and just depress the tensioner arm so compressed air it is

big woo, how many psi's do i need to make sure they stay up

 

[BogusSVO]

any thing over 80psi should be just fine.....