As far as the lifters go, it may be a moot point. If you had the valve seats cut or the valves ground, you will need to check the valve clearance no matter what. Most shops are too stupid to realize that when you cut the seats/grind the valves, you must check the valve stem projection into the lifter bore both before AND after the valve work. Then, if you give a crap about your customer, you should grind the tips of the valve stems down so to the original specs so they don't have to buy an array of valve shims to get the clearance.A shop down here in TN did a really nice job on a head for a friend. They put the head on, but there was no compression. Turns out the shims were keeping all the valves open.As for the prechambers. Good luck on that one.
Quote from: Quantum TD on May 05, 2011, 02:44:40 pmAs far as the lifters go, it may be a moot point. If you had the valve seats cut or the valves ground, you will need to check the valve clearance no matter what. Most shops are too stupid to realize that when you cut the seats/grind the valves, you must check the valve stem projection into the lifter bore both before AND after the valve work. Then, if you give a crap about your customer, you should grind the tips of the valve stems down so to the original specs so they don't have to buy an array of valve shims to get the clearance.A shop down here in TN did a really nice job on a head for a friend. They put the head on, but there was no compression. Turns out the shims were keeping all the valves open.As for the prechambers. Good luck on that one. Again with the machine shop bashing! What the hell is it with this site?? I go to a dozen different forums for the various cars/bikes/racecar I own-and this one--and ONLY this one-- automatically start bashing machine shops any time someone asks a boring or valve job question!! People around this site seem to think that because they replaced a head gasket once , they know more than a shop that's been around for 30 years! How come noone in here has ever heard of-or mention a bad-plumber-body shop-bakery?? Its just all machine shops that don't know what they are doing.
...BTW your Bieber avatar is awesome.-Malone
Quote from: sdwarf36 on May 06, 2011, 06:39:50 amQuote from: Quantum TD on May 05, 2011, 02:44:40 pmAs far as the lifters go, it may be a moot point. If you had the valve seats cut or the valves ground, you will need to check the valve clearance no matter what. Most shops are too stupid to realize that when you cut the seats/grind the valves, you must check the valve stem projection into the lifter bore both before AND after the valve work. Then, if you give a crap about your customer, you should grind the tips of the valve stems down so to the original specs so they don't have to buy an array of valve shims to get the clearance.A shop down here in TN did a really nice job on a head for a friend. They put the head on, but there was no compression. Turns out the shims were keeping all the valves open.As for the prechambers. Good luck on that one. Again with the machine shop bashing! What the hell is it with this site?? I go to a dozen different forums for the various cars/bikes/racecar I own-and this one--and ONLY this one-- automatically start bashing machine shops any time someone asks a boring or valve job question!! People around this site seem to think that because they replaced a head gasket once , they know more than a shop that's been around for 30 years! How come noone in here has ever heard of-or mention a bad-plumber-body shop-bakery?? Its just all machine shops that don't know what they are doing.Man you need to get your machine shop in order...Eveybody I know that doesn't have a problem would laugh at this post so you must have a problem. If not then please refrain from invading this guys post with non information. To me it is more disruptive than someone "machine shop bashing"1. I would check all the valve clearances and readjust as needed. With that many miles you might opt for new hardware anyhow.2. I would see what it measures when you heat the head and freeze the prechambers before assembling. Like a dry run. If you are .001 too tight it will not be a fun day. If they are .003" or more I would see if a qualified shop would recommend.