I wonder what makes this seller think this is a high compression head?
https://www.ebay.com/itm/Model-A-For....c100033.m2042
https://www.ebay.com/itm/Model-A-For....c100033.m2042
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Enough carbon deposits to bump it up to 4.3? I wonder why Model A people think 6.0 is high compression? My lawn mower is 7.5:1.Mechanical engineering 101: If you put an adjustment knob, screw, bolt, or tolerance specs on something, some people will immediately fiddle with it. If you mark it DO NOT TOUCH everyone will mess with it.
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Tom, I didn't know most of mine must be high compression ! They look just like that one.png "smile")
Pat
Model A's and of course the famous AA'sComment
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Silly, the guy was high when he did a compression test
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The compression was so high it push backward on the water pump impellor shaft and wore deep into the web in the head.
Oh wait, original 4.2 heads did that all the time......and we all use a collar to stop that now. OK, I give, it is hi-comp because he says so
LOL good find, Tom, so when are you gonna install it?Comment
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Not me, I bought the 5.5 head from Bert's when I stopped there about 10 years ago. Still haven't installed it yet though.Originally posted by tbirdtbird View Post
Time to make another trip to Bert's to check out his new location.Comment
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His new place is set up real nice Tom.Comment
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Looks like a common $15 take a chance head. Rod"Much of the social history of the Western world, over the past three decades, has been a history of replacing what worked with what sounded good." Thomas SowellComment
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New Prus 8:1 aluminum high compression head installed. Can maintain 35 mph on hills I used to have to downshift into Ruckstell with. A noticeable improvement in performance all around. The aluminum head weighs 12 lbs. The old 3.98:1 cast iron head weighed 28 lbs.
...03-25-2018, 11:55 AM -
Tom W in particular will be interested in this.
The debate, at least in the Model A world, will rage on in perpetuity, despite that the Service Bulletins state to re-torque hot.
Anyway, I was wading thru my Motors manuals, going back into the early thirties, looking for some total advance comparison from earlier Stude 6-cyl with a 6.5 CR head, to the upgraded 8.3 head that was used...07-12-2018, 09:32 AM -
Sometimes people ask about a B head, but they aren't specific whether they mean the Model A high compression head with the "B" cast in it, or are they talking about the Model B engine head with the large "C" cast in it. Besides the letter cast in each head, they are very easy to tell apart by the water pump.
The Model A head with the "B" cast in it has the regular...07-12-2017, 11:04 AM -
A few years ago, someone gave me a truck load of model A engines that had been poorly stored. I saved 2 of them, but the rest were so rusted that I could only save a few parts from them.
My brother is more persistant, and sent me these photos yesterday of his attempt to remove a stuck head. I think the new engines being cast by Tod will solve this sort of problem.You do not have permission to view this gallery.
This gallery has 3 photos.05-31-2018, 06:15 AM -
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There is a HUGE DIFFERENCE in operation between the Original patented Marvel INVERSE oilers and the Ampco and other simple knockoffs that feed oil DIRECTLY proportional to engine vacuum. People often confuse the two as similar in function.
An inverse oiler (Only Marvel oilers) feed less oil when the manifold vacuum is high (cruising, idling) and more when the vacuum is less (accelerating,...12-09-2017, 06:05 PM -
Ordered a 5.5:1 Snyder head via Mac's back in April. Just put it on Saturday night in preparation for the MARC national tour later this month. After I put it on, water was pouring out of the alignment pin hole under the distributor. Seems whoever machined this head drilled right down into the water jacket. Threaded the hole, installed an Allen screw with thread lock sealant and got the leak fixed....09-09-2018, 08:29 PM -
I just purchased a 5.5:1 high comp. head from Snyder's. I'm sending the short block out to the folks in Skokie, Il. for a rebuild. I checked with them and they use the same paint that Snyder's sells. I want to paint the head before I get the block back. I think I know what to do regarding prepping and painting the head, but I wanted to double check with you guys first. Thanks in advance, Smi...07-28-2017, 08:04 AM -
I am looking for a drawing of the stud locations vs the center line of the cylinder bores. I have a Winfield 7:1 crow's foot head that I need to have flycut to clear the pistons that stick up .062" above the block. I have been using a standard gasket, a solid copper gasket and then another standard gasket. That is not really working well at this time. It left me with a crack between the water...08-08-2018, 11:26 AM -
I'd like to pick up a little extra horsepower for the occasional long hill but don't want to do an engine overhaul or install a turbocharger. Are there some improvements that I might do in my garage? Keeping it "looking" original is always a plus. Thanks02-07-2018, 08:21 AM
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