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]

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I am the Guardian, I hate helos, everything leaks.......

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...

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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

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

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Home of Slant6-powered fun machines since 1988

Ive run worse. As Lou says Hardened washers and run as is. If your Really worried Magnaflux the pads.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

another words run the stud set up (has hardened washers with it) and be happy, gotcha, appreciate all the help guys,

-Mike

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I am the Guardian, I hate helos, everything leaks.......

No need for studs. Hardened head bolt washers are quite common. I use them whenever I mill a block and/or head.

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Joshua

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

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Home of Slant6-powered fun machines since 1988

already have the studs, and it will be a boosted motor

-Mike

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I am the Guardian, I hate helos, everything leaks.......

Ok, go for it. Should have washers already with the stud kit...

Lou

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Home of Slant6-powered fun machines since 1988

Washers, and dremel out the chips so they're smooth........ (no possible crack propagation)

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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

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I am the Guardian, I hate helos, everything leaks.......