Cudafever said

I will be real interested to find out what thickness the head gasket is. Maybe it was the piston to valve clearance that caused the cam to fail.
Was the lobe that failed on # 7 or 8?...... them are the tallest pistons.......
I'm not as much interested in brand as in thickness of head gasket.
The eddys came in two flavors one ment for the higher compression eng and one ment for the low compression 340/360 eng.
So yes, them are the wrong heads, BUT the proper head gasket will fix the problem.
The 340 head had a small ring, the same size as the bore to let a pop up piston have plenty of clearance.

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rustycowll69 said

question: the pics of the piston tops, show eyebrows for valve clearance, but the eyebrows appear to have a dent or something about mideyebrow where the eyebrow meets the top of the piston(inboard) side. The dent, or whatever it is, seems to vary from piston to piston. So what''s going on there?
Also, what size valves are we dealing with in these heads? Have you tried to clay the top of the pistone to gauge what kind of minimum clearances(piston to head, & piston to valve) you have?

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• Cylinder Head Specifications:
• Combustion chamber volume: 63cc / 65cc
• Intake runner volume: 171cc
• Exhaust runner volume: 77cc
• Intake valve diameter: 2.02"
• Exhaust valve diameter: 1.60"
• Valve stem diameter: 11/32"
• Valve guides: Manganese bronze
• Deck thickness: 5/8"
• Valve spring diameter: 1.46"
• Valve spring maximum lift: .575"
• Rocker stud: N/A
• Guideplate: N/A
• Pushrod diameter: 5/16"
• Valve angle: 18°
• Exhaust port location: Stock
• Spark plug fitment: 14mm x 3/4 reach, gasket seat

70aarcuda said

dont get to excited about the deck height being all over the place went you measure it with the pistons in it...
Unless the crank has had it stroke indexed and equalized...and the rods have had their center to center blueprinted ....they would all be different even if the deck is square...

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