| Slant Six Forum https://slantsix.org/forum/ |
|
| head bolt mounting pad chipped, head a lost cause ? https://slantsix.org/forum/viewtopic.php?t=38774 |
Page 1 of 1 |
| Author: | Volare4life [ Tue Jan 26, 2010 12:47 pm ] |
| Post subject: | head bolt mounting pad chipped, head a lost cause ? |
Just started cleaning my 2nd slant head ('76 peanut head) and noticed that the head bolt mounting pads on pushrod side are all chipped on the left side (when viewed from the pushrod side((left side of lead))) heres the pics     and the ID mounting pad  I will be using head studs, and just need to know 2 things 1.) What would cause this ? 2.) Is the head salvagable/useable with head studs ? -Mike[/img] |
|
| Author: | WoodyB [ Tue Jan 26, 2010 2:15 pm ] |
| Post subject: | chipped boss |
Best to take it to a shop that can spot-face and have them mill the flats-.030-.050" down just to clean up and give better seating pressure and rod the faces of any cracks/potential cracks. What caused it? Could be many things...poor casting-porosity/improperly torqued (using a impact can do similar damage), sometimes old head bolts are 'stuck' so some mechanics heat the bolt heads and apply hammer torque to break the threads loose...the holes might be out of perpendicularity (but that would have to be quite a bit, +.015" or more). COULD be a combination of thing as as well, nonethesless, it's salvageable. That casting does look a bit porous. Might not have had enough nickle in the mix or maybe it wasn't hot enough prior to the pour... |
|
| Author: | RustyRamcharger [ Tue Jan 26, 2010 9:48 pm ] |
| Post subject: | |
They don't look bad enough to worry about if you have a street engine. You can mill them if you want, but then you'll need to consider cap screw length or the thread height if using studs. Ken 
|
|
| Author: | Dart270 [ Wed Jan 27, 2010 7:09 am ] |
| Post subject: | |
I would run it as is, and just throw some hardened washers on those holes. This is not rocket science. I'm sure a machine shop can spot mill them too, as Woody mentioned, which would be the orthodox way to fix it. Lou |
|
| Author: | 66aCUDA [ Wed Jan 27, 2010 7:44 am ] |
| Post subject: | |
Ive run worse. As Lou says Hardened washers and run as is. If your Really worried Magnaflux the pads. Frank |
|
| Author: | Volare4life [ Wed Jan 27, 2010 12:16 pm ] |
| Post subject: | |
another words run the stud set up (has hardened washers with it) and be happy, gotcha, appreciate all the help guys, -Mike |
|
| Author: | Joshie225 [ Wed Jan 27, 2010 12:39 pm ] |
| Post subject: | |
No need for studs. Hardened head bolt washers are quite common. I use them whenever I mill a block and/or head. |
|
| Author: | Dart270 [ Wed Jan 27, 2010 2:42 pm ] |
| Post subject: | |
I have seen plenty of good running motors at 11:1 and even 12:1 (Tilley) using stock head bolts. Can use washers on them too, yes. Spend money elsewhere unless you are building an all out motor. Lou |
|
| Author: | Volare4life [ Thu Jan 28, 2010 9:07 am ] |
| Post subject: | |
already have the studs, and it will be a boosted motor -Mike |
|
| Author: | Dart270 [ Thu Jan 28, 2010 2:46 pm ] |
| Post subject: | |
Ok, go for it. Should have washers already with the stud kit... Lou |
|
| Author: | emsvitil [ Thu Jan 28, 2010 2:57 pm ] |
| Post subject: | |
Washers, and dremel out the chips so they're smooth........ (no possible crack propagation) |
|
| Author: | Volare4life [ Fri Jan 29, 2010 12:31 pm ] |
| Post subject: | |
I already smoothed out the little bit of roughness around the pads with a emery board, took awhile, but I wasn't going to risk dremeling too much, Thanks again guys, -Mike |
|
| Page 1 of 1 | All times are UTC-08:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|