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05-10-2016, 02:59 PM | #1 |
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Determining if 49-53 Weiand Aluminum Heads have been milled
I have chance to buy a nice used pair of 49-53 Weiand Heads. The face of the heads show where the combustion ring of the head gasket was seated and there is practically no corrosion around the water ports. I want to make sure that the heads have not been milled or to determine how much they have been milled.
Does anyone have a measurement from the spark plug seat to the face of the head and/or the depth of the combustion chamber to the face of the head. Measurements in thousands of an inch would be appreciated.
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05-10-2016, 03:36 PM | #2 |
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Re: Determining if 49-53 Weiand Aluminum Heads have been milled
Just post some detailed pictures - that will give us an idea. If the combustion chamber areas over the pistons are smaller - than you know it has been milled.
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05-10-2016, 08:28 PM | #3 |
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Re: Determining if 49-53 Weiand Aluminum Heads have been milled
I haven't taken pictures. As I recall the edges of the combustion chambers are right out against the impression of the head gaskets.
Thanks, Bored&Stroked. However, still looking for requested measurement(s) to double check.
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05-10-2016, 10:01 PM | #4 |
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Re: Determining if 49-53 Weiand Aluminum Heads have been milled
The model A weiand head i have that has never been cut has the compression ratio stamped in 2 places, one you can see with the head on, the other on the machined surface for the gasket---perhaps on V8 near the water neck, on the 4 it is by the waterpump
how close do the relief for the piston dome come to the gasket edge |
05-11-2016, 01:58 AM | #5 |
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Re: Determining if 49-53 Weiand Aluminum Heads have been milled
Do you need uncut heads for a reason? I ask as the Weiand heads are relatively low compression compared with the regular high compression heads. About 70cc chamber.
Martin. |
05-11-2016, 08:57 PM | #6 | |
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Re: Determining if 49-53 Weiand Aluminum Heads have been milled
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Quote:
The relief (edge of dome) comes right out to the edge of the impression of the head gasket. Likely not milled.
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05-11-2016, 09:09 PM | #7 | |
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Re: Determining if 49-53 Weiand Aluminum Heads have been milled
Quote:
I really don't need uncut heads. Primarily, I just want to know where I'm starting from (no surprises). I haven't decided what cam to use, but it will be something without a lot of lift. I just want a decent running street engine. I will check piston to dome and valve open clearances and may even mill the heads to get the compression up.
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05-12-2016, 07:29 AM | #8 |
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Re: Determining if 49-53 Weiand Aluminum Heads have been milled
Installing heads requires a few measurments, to take advantage of a tight combustion chamber for better complete combustion. This has nothing to do with compression ratio. However, knowing the CR will determine the Octane requirement of the engine. The piston to head clearance should be .040/.050". and the volume of the chamber will determine the CR. As long as the valves don't hit the head your golden. Good luck
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