CVO Technical > Twin Cam

103 screaming Eagle heads piston options

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69shovelsled:
So I have a 04 screaming Eagle 103 and I bought weisco dome 103 .060 pistons. Will that dome work with those heads? Or am I going to have to mill the dome off?  I read somewhere they won’t work with those heads because of the chamber shape. And also what lift can the springs handle?

Thanks in advance

johnsachs:
Will NOT WORK. SE 103" heads have a round chamber shape. Standard RPO 103"  heads, have a bath tub shape. Before you start removeing the dome, you better check the thickness of the piston in that area,( top of dome to under side of the piston ). What cam set/grind are going to run ? You can mill your SE heads up to .060", without needing to remove material from the intake pads.
RE VALVE SPRINGS: What cams are you planning to use ?  IIRC, your 103" SE Cams, CVO 253, have a max lift of .530". If you are NOT going to use cams with more than .530" lift, the SE springs will work. And DON"T believe the NONSENSE, that the SE Springs are " bad/junk/too much tension ". I've built an untold amount CVO engines, with those springs, and NEVER had an issue.
John

69shovelsled:
The cam is 598 mackie. We got springs for it. Kibble white.
    What is the reason the dome pistons won’t work? Too much compression? I don’t see them having any head interference? That mackie cam needs ALOT of compression because it bleeds so much off. Thanks for the reply


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johnsachs:

--- Quote from: 69shovelsled on July 09, 2024, 05:41:33 PM ---The cam is 598 mackie. We got springs for it. Kibble white.
    What is the reason the dome pistons won’t work? Too much compression? I don’t see them having any head interference? That mackie cam needs ALOT of compression because it bleeds so much off. Thanks for the reply


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--- End quote ---
From what you posted, it sounds like you have dome pistons for the "Bath Tub" style chambers. You need "Hemi" style pistons for the round style CVO heads chambers.
Post a picture of the piston and the combustion chamber.
John

69shovelsled:
You are correct, i machined the dome off of them. They are good to go now.


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