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Topic: 356 CI Compression Ratio

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Scott

Re: 356 CI Compression Ratio

#31

Home away from home

I believe the 356 is the largest displacement engine this HC head will fit.

Quote:

TxGoat wrote:
Heads with larger combustion chamber volume are probably for higher displacement engines. As I understand it, a number of Packard heads will interchange among different displacement engines.

Posted on: 7/23 12:09

1942 Clipper Club Sedan
1948 Custom Touring Sedan (22nd Series)
1955 Patrician Sedan
1955 400 Sedan

Scott

Re: 356 CI Compression Ratio

#32

Home away from home

I've little doubt the heat riser valve has been stuck in the past. If my suspicion that the original head has been planed based on the volume measurements that would support a story that the head gasket failed and was replaced sometime in the past -- perhaps the head was found to be warped or eroded. The valve lifters are hydraulic on the 356.
BTW, I did measure the 327 head prior to installation with machinists straightedge and feeler gauge, measuring up to 3 thou in the center from the ends, which is the limit.

Quote:

TxGoat wrote:
I'd guess that at some time or other, the head gasket on that cylinder leaked, or the engine got water in that cylinder from some other cause. Chronic detonation can cause erosion of metal surfaces, but this would usually show up in damage to the piston.
An intake manifold leak can lead to burned valves in specific cylinders due to running too lean. A problem with the water distribution tube in the block could lead to valve problems in a particular cylinder, and so could improper valve adjustment or a a stuck manifold heat valve.

Posted on: 7/31 15:25

1942 Clipper Club Sedan
1948 Custom Touring Sedan (22nd Series)
1955 Patrician Sedan
1955 400 Sedan

Packard Don

Re: 356 CI Compression Ratio

#33

Home away from home

A warped or bent head should pull down flat quite easily and even very slight imperfections will be sealed when using a proper head gasket and Copper-Coat or some other similar sealant. Planing should be done only in extreme cases.

Posted on: 7/31 16:08

All generalities are false.

Don Pierson
Packard / IMPERIAL page
CA DMV Licensed Vehicle VIN Verification

1951 Henney-Packard 3-Door Long Wheelbase Air Force Ambulance
1954 Packard Patrician
1954 Packard Patrician Parts Car
1956 Clipper Custom Sedan

Scott

Re: 356 CI Compression Ratio

#34

Home away from home

Some people do it to raise compression too. My Custom had a distinctive racing stripe when I bought it that had been applied by someone sometime prior to the early 60's. Maybe the head was planed, but the 327 head still had a slightly smaller combustion chamber so I used it. I did use the copper spray sealant.

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Quote:

Packard Don wrote:
A warped or bent head should pull down flat quite easily and even very slight imperfections will be sealed when using a proper head gasket and Copper-Coat or some other similar sealant. Planing should be done only in extreme cases.

Posted on: 8/4 12:25

1942 Clipper Club Sedan
1948 Custom Touring Sedan (22nd Series)
1955 Patrician Sedan
1955 400 Sedan

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