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Old 04-22-2011, 09:23 PM
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Dome or Flat Top

OK, Today I ordered my aluminum heads to go on my 70 LT-1 motor
I have one cylinder that I dont like so it will be bored .30 over
Everyone tells me to use flat top pistons because of our gas but I am stubborn and want to stick with domes. Especially since I have pink rods and all the good stuff from long ago
I will be running solid lifters, I know but I like the clicking sound
You guys are smarter than me so I will listen
This will be a driver only car and probably less than 2000 miles a year. Even less if gas keeps going up

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Old 04-22-2011, 09:29 PM
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My Mistake

I found the answer in some other posts so I will go with the flat tops
Thanks
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Old 04-22-2011, 09:58 PM
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Domed pistons can interfere with proper flame propagation. Always try to use flat tops and smaller chambers when possible!
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Old 04-22-2011, 10:20 PM
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if you have to buy new cylinder heads I would try to buy a large enough combustion chamber to use flat top pistons while remaining proper quench height of .041 to .061 for a daily driver, the closer to .041 you can get the better of it will be. Flat tops are better at resisting hot spots on the piston due to better flame travel across the top of it. This is why the hemi engine has never really been a "reliable" engine is due the the HEMIspherical shaped combustion chamber requiring domed pistons to get any compression out of it. The HEMIshpherical shaped combustion chamber is a good idea for creating power but not worth the domed pistons. If you need to run a dish piston to lower compression ratio the best choice is probably Keith Blacks D-shaped cup pistons which put all the dish to one side to keep the "quench" area flat for better atomization of fuel.

I don't understand why you are only boring one cylinder though? Are you saying you are going to buy all the pistons individual? Or are you buying a set of 8 pistons and 1 single piston? Then you are going to buy 2 ring sets? If you have the rotating assembly balanced, which you should, they are going to have to take an extra amount of that one piston to balance the engine. I would just bore all 8 cylinders that way they are all the same.

As far as the solid lifter, why? For just a daily driven car that is going to only see a few miles a year why would you want the maintenance of a solid lifter if you don't have to? Just clothespin a playing card to the fan blade like we used to do to our bike spokes when we were kids.

I would be interested in your complete specs of everything for this engine and what you are looking to get out of it
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Old 04-22-2011, 10:54 PM
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Quote:
Originally Posted by Bubber
OK, Today I ordered my aluminum heads to go on my 70 LT-1 motor
I have one cylinder that I dont like so it will be bored .30 over
Everyone tells me to use flat top pistons because of our gas but I am stubborn and want to stick with domes. Especially since I have pink rods and all the good stuff from long ago
I will be running solid lifters, I know but I like the clicking sound
You guys are smarter than me so I will listen
This will be a driver only car and probably less than 2000 miles a year. Even less if gas keeps going up
Building with flat tappets these days is a roll of the dice, so do everything you can to insure longevity. Please read this....
http://www.crankshaftcoalition.com/w...ips_and_tricks
http://www.proracingsim.com/dynosimmainpage.htm
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Old 04-23-2011, 05:33 PM
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Boring one cylinder

Quote:
Originally Posted by crussell85
if you have to buy new cylinder heads I would try to buy a large enough combustion chamber to use flat top pistons while remaining proper quench height of .041 to .061 for a daily driver, the closer to .041 you can get the better of it will be. Flat tops are better at resisting hot spots on the piston due to better flame travel across the top of it. This is why the hemi engine has never really been a "reliable" engine is due the the HEMIspherical shaped combustion chamber requiring domed pistons to get any compression out of it. The HEMIshpherical shaped combustion chamber is a good idea for creating power but not worth the domed pistons. If you need to run a dish piston to lower compression ratio the best choice is probably Keith Blacks D-shaped cup pistons which put all the dish to one side to keep the "quench" area flat for better atomization of fuel.

I don't understand why you are only boring one cylinder though? Are you saying you are going to buy all the pistons individual? Or are you buying a set of 8 pistons and 1 single piston? Then you are going to buy 2 ring sets? If you have the rotating assembly balanced, which you should, they are going to have to take an extra amount of that one piston to balance the engine. I would just bore all 8 cylinders that way they are all the same.

As far as the solid lifter, why? For just a daily driven car that is going to only see a few miles a year why would you want the maintenance of a solid lifter if you don't have to? Just clothespin a playing card to the fan blade like we used to do to our bike spokes when we were kids.

I would be interested in your complete specs of everything for this engine and what you are looking to get out of it
I will not do anything half assed so I am boring all cylinders even tho only one is bad
I am an old fogey and love the sound of solid lifters. I was lucky enough to have bought a new, straight from the showroom 1970 LT1 and I loved it but jr came along so everything was on back hold til he was grown
I have a daily driver Honda and this Vette + a 98 Pace Car so it will not get much riding
Now days I cannot hot rod a car cause if something breaks I may not be able to replace it
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Old 04-23-2011, 05:36 PM
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Great choice on the flat-top's that is how i would have went also.
You need to post up some pics of your vette also.

Cole
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