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Head surface question

  • Thom
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21 May 2020 20:12 #40213 by Thom
Head surface question was created by Thom
Seeking advice for 1933 8101A Auburn concerning reinstalling the head. I have taken the head to a machine shop and found out that at the distributer shaft area of it, it has a gap of .023 . This gap tapers in both directions for about 6 inches. I do not have the resources to remove the engine to have the block checked or machined. If I put a 2 foot square across the block, I can see light between the block and the square. Here are my questions: 1) Will a new head gasket fill in the gaps when torqued? 2) Is it wise to take .025 off the head to true it up or is that too great an amount? 3) Since the block will not be machined, is it worth correcting the head surface? 4) How forgiving are these great old engines? Any advice will be truely appreciated. Thom

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21 May 2020 21:30 #40214 by rlwardne
Replied by rlwardne on topic Head surface question
I would do the head. Your machine should be able to calculate how much it’ll raise the compression ratio but these are fairly low compression cars anyway. If you can borrow a machinist straight edge and check the block by sliding feeler gauges under it.Those copper asbestos head gaskets are pretty forgiving.
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21 May 2020 21:32 #40215 by 1748 S
Replied by 1748 S on topic Head surface question
All this sounds terrible but... How have you determined these dimensions? Personally I WOULD NOT take that much off the head or the block. As to answering the question of using a straight edge on the block. I suggest you use ONLY a true machinist straight edge. Any other straight piece of any level or edge is going to be "close" but not straight. Hopefully you will find these 25 thousands mearurements are untrue because of how you measured them. Everything in my personal shop is the Starratt brand micrometers, calipers and depth gauges. They are expensive but you get what you pay for. Nothing less like some of the other cheaper brands made overseas or worse.


Gary Parsons

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  • Thom
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21 May 2020 22:40 #40219 by Thom
Replied by Thom on topic Head surface question
I took the head to the machine shop. On his flat surface, he was able to slide a .020 feeler gauge under the center at the distributor hole but not .025. .023 would slide under also. Both ends were flat to the table. Closest straight edge I had at home was the square. I will ask to borrow his straight edge to check the block. My main concern is the .023-.025 space.

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22 May 2020 04:19 #40226 by mikespeed35
Replied by mikespeed35 on topic Head surface question
Here are specs. from 1931 when copper asbestos gaskets were used. Block flatness Good .003, Fair .007, recondition .010. I have usually found that block flatness is usually good. .020 on head is too much.
CORDiallyMike

Mike Huffman
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22 May 2020 14:20 #40233 by Thom
Replied by Thom on topic Head surface question
Thanke for all the replies. Thay have been helpful.

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