intergrated heads, options and modification

[Vbb199]

I've yet to pull the head off of my own 250, so I'm afraid I can't help with a lot of personal experience there. Referring to my Haynes manual, it says you will need to remove rocker arms and pushrods in addition to the valve cover. Obviously since they're attached to the heads, you'll be removing the intake and exhaust manifold assembly as well.

As far as head bolts, specs seem to indicate 95 ft-lbs, though again I'm looking at a book for 73-87 so I can't be positive that's correct for your (presumably 1970) inline 6, you may want to do some independent verification of that. I personally would just re-use the bolts after a thorough cleaning, but that may be a terrible idea because (again) I've never done this before. Also here's a (poor) picture of the torque sequence, it seems to jive with some other diagrams I've found online.

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The Haynes manual also suggests adding a coat sealant if you're using a steel gasket.

Not sure if any of that helps at all, but good luck I suppose. Also, you may want to start a new thread with your question since this one's kinda old.

You ideally don't wanna reuse the head bolts.

They stretch from thermal expansion of the combustion process over and over and over again.

I've reused head bolts, but that's because the particular motor didn't have blind, tapped holes.

If the block has blind holes, you definitely want to stay away from reusing the bolts, they won't bring the head down flush


Where my knowledge stops is, I don't know if a 250 has blind tapped holes or not.

 

[HotRodPC]

I've reused head bolts on many 230 and 250's and never had an issue. Always just made sure I did the proper torque spec and in proper order. Did about 80% of the torque through rotation, then started over and went to 100% through proper rotation and weld the hood shut.

 

[AuroraGirl]

You ideally don't wanna reuse the head bolts.

They stretch from thermal expansion of the combustion process over and over and over again.

I've reused head bolts, but that's because the particular motor didn't have blind, tapped holes.

If the block has blind holes, you definitely want to stay away from reusing the bolts, they won't bring the head down flush


Where my knowledge stops is, I don't know if a 250 has blind tapped holes or not.

Inline 6 are literally so perfect that you can reuse the head bolts.

SiX iN a RoW, rEaDy To ToW

 

[Vbb199]

Inline 6 are literally so perfect that you can reuse the head bolts.

SiX iN a RoW, rEaDy To ToW

 

[79Scott]

All this talk about the 4.1 integrated head motor, I just sold my 79 with 140k on it about 9 months ago!!!

 

[Matt Lutz]

Glad this thread pooped up. I love the straight 6s! Hopefully one day I'll run across a deal on one.

If you are close to Texas I just took a 250/6 out of my GMC. Make you a great deal! Standard head and exhaust manifold on it. I also have a new 2bbl carb with the elect choke I never used if someone needs one