closed chamber heads piston
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the dome looks like a closed chamber dome but you'll need to check it if there isnt a piston ID.
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3,494 Posts
I agree, that sure looks like a typical closed chamber piston.
You obviously have the heads off, so why not put some clay on the dome, install a head, roll it around, and see.
You obviously have the heads off, so why not put some clay on the dome, install a head, roll it around, and see.
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2,739 Posts
Should.
The closed chamber head is more of a square bathtub; the open chamber is more of an oval around the side opposite the spark plug.
Those look like closed chamber domes.
As said though, only way to know for sure, is to measure it. Big block combos are just ... like that.
The closed chamber head is more of a square bathtub; the open chamber is more of an oval around the side opposite the spark plug.
Those look like closed chamber domes.
As said though, only way to know for sure, is to measure it. Big block combos are just ... like that.
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They won't fit in open chamber heads PERIOD.
Compression ratio in that configuration is "undefined".
Or actually, more like, "parts broken".
Don't look like any kind of super-high domes to me. Nothing too outrageous.
CR will depend, in any case, on THE SPECIFIC heads they are used with; as well as, their deck height.
Compression ratio in that configuration is "undefined".
Or actually, more like, "parts broken".Don't look like any kind of super-high domes to me. Nothing too outrageous.
CR will depend, in any case, on THE SPECIFIC heads they are used with; as well as, their deck height.
They wont work with open chamber heads? Whys that?They won't fit in open chamber heads PERIOD.
Compression ratio in that configuration is "undefined".
Don't look like any kind of super-high domes to me. Nothing too outrageous.
CR will depend, in any case, on THE SPECIFIC heads they are used with; as well as, their deck height.
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2,739 Posts
http://www.ebay.com/itm/350801342330
I just told you why; basically, square peg, round hole; but as they say, a picture is worth 1000 words.
Whaddya think?
I just told you why; basically, square peg, round hole; but as they say, a picture is worth 1000 words.
Whaddya think?
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2,739 Posts
Tell it to the parts...
Look at the pics?
Whaddya think?
Square peg fit in da round hole?
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7,878 Posts
Some closed chamber pistons WILL work with open chamber heads but you need to check clearances. Some pistons just wont clear without a ton of clearance work, some clear with no clearance work.
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7,294 Posts
First, yes that is a closed chamber design piston
Now,,
12cc is not going to get you any where near 10 to 1 with most open chamber heads that are in the 118-124cc range
It takes an 18cc's piston to get to 10.2 in a 496 stroker with a 118cc head & a zero decked block,, going to be a lot less in a 454
As far as fitting most closed chamber pistons with the smaller domes will fit either head but you have to check some hit in the corners
Very easy to do,,,
Just set the head on with no gasket & if it clears rotating the engine you are good to go with a standard .039-.041 gasket
If it picks the head up you have a problem,,,
Its a 496 stroker. I thought i was doing my static compression test right. Whar would compression be with the closed chambers then. ThanksFirst, yes that is a closed chamber design piston
Now,,
12cc is not going to get you any where near 10 to 1 with most open chamber heads that are in the 118-124cc range
It takes an 18cc's piston to get to 10.2 in a 496 stroker with a 118cc head & a zero decked block,, going to be a lot less in a 454
As far as fitting most closed chamber pistons with the smaller domes will fit either head but you have to check some hit in the corners
Very easy to do,,,
Just set the head on with no gasket & if it clears rotating the engine you are good to go with a standard .039-.041 gasket
If it picks the head up you have a problem,,,
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7,878 Posts
Do you know what brand pistons they are? Kinda looks like a KB dome. Most pistons usualy have a oversize stamped on them along with the part number.
Its the eagle stroker kit with the KB stroker pistons clearenced for the 4.25 crank
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7,878 Posts
Ok, well I come up with about 9.6:1 using a 119cc head and 11.25 using a 100cc head. The KB`s are hyperutectic which is fine if your building a street engine. I ran KB`s years ago without any issues but some people have suffered cracked pistons if you let it rattle too much.
Which closed chamber heads were you planning to use? Ovals or square port? Either way I would use a flat top with any closed chamber head. I would use a open chamber head for sure, easy to run pump gas at 9.6:1 and will let that thing breath better than the closed chambers.
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7,294 Posts
Can't answer unless you know the chamber cc's of the heads you are going to use
I have a set of big ovals closed 702s and a set of 049s open. 049 have 2.19 1.88 ex and arnt ported. 702s have 2.19 and 1.88 valves and are ported. Both big oval ports
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7,878 Posts
Id go with the 049`s. 702`s put the compression too high for pump gas and that intake valve is too shrouded, even if they have been unshrouded. Your 049`s will work great, even without the porting. Since they are off it doesnt take much to pop the valves n`springs and do a little bowl work and a gasket match. What are you planning to use for a cam?
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