Thanks for sharing your learnings, regardless of what happened. Sounds like some painful lessons but you are on-track for some real good stuff. Shaun is the man.
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thats a good potential option. i have no idea what their part numbers are, but its worth looking into. the biggest potential issue is the valve reliefs might be in the wrong spot. since the voodoo heads have spread out the valves, the angles may have changed to the point that the PTV clearance may end up on an angle. I do have less lift than the voodoo cams, so that may negate any angular differences. then as you mentioned, we don't know if the crank side rod journals are the same diameter. its just so risky.voodoo child21 said:Steve
What about just using the GT350 rods and piston package? Are the big ends a different size? I don't think so and they are in engines warrantied for 8250 RPM operation. Valve reliefs shouldn't be an issue since they are bigger. I would ask around.
Steve
pufferfish said:well, my conversation with Tim at MPR was enlightening. Basically, my pistons are wrong and so are the rings. So, I'm going to have to cough up another $1100 or so and wait 4 weeks for custom pistons to be made. UUGGH!
I am now very glad I didn't decide to push through the weekend on track.
Heres the synopsis. While Ford claims no special rings are needed for the voodoo block, they do actually need special rings. When he discussed ring materials, I had no idea what they were or if they differed from standard rings, but what caught my attention was the need for high tension oil rings. The higher cylinder expansion needs higher tension rings to control oil better. Next, the top ring land in the piston neeeds to be vented to allow the top ring to stay seated. The Manley pistons do not have this. On the plus side, I am dialing up 12:1 compression, cuz it costs me nothing more and will push out more torque.
So, this is officially not a low cost 5.2L build. The special parts required are pushing the price to the point of a sleeved big bore aftermarket short block. I do think there are a few distinct advantages to the voodoo block, such as lighter curb weight, better cylinder cooling (for 12:1 compression on 93 octane), better piston squirter technology. But, on the downside is long-lead specialty parts and the inability to recondition the cylinders at the end of its lifespan. The block strength is probably negligable, when comparing a sleeved aftermarket block to the voodoo block.
pufferfish said:well, my conversation with Tim at MPR was enlightening. Basically, my pistons are wrong and so are the rings. So, I'm going to have to cough up another $1100 or so and wait 4 weeks for custom pistons to be made. UUGGH!
I am now very glad I didn't decide to push through the weekend on track.
Heres the synopsis. While Ford claims no special rings are needed for the voodoo block, they do actually need special rings. When he discussed ring materials, I had no idea what they were or if they differed from standard rings, but what caught my attention was the need for high tension oil rings. The higher cylinder expansion needs higher tension rings to control oil better. Next, the top ring land in the piston neeeds to be vented to allow the top ring to stay seated. The Manley pistons do not have this. On the plus side, I am dialing up 12:1 compression, cuz it costs me nothing more and will push out more torque.
So, this is officially not a low cost 5.2L build. The special parts required are pushing the price to the point of a sleeved big bore aftermarket short block. I do think there are a few distinct advantages to the voodoo block, such as lighter curb weight, better cylinder cooling (for 12:1 compression on 93 octane), better piston squirter technology. But, on the downside is long-lead specialty parts and the inability to recondition the cylinders at the end of its lifespan. The block strength is probably negligable, when comparing a sleeved aftermarket block to the voodoo block.
pufferfish said:I intend for this to be a kit for the S197 guys to work on either the 5.0 or 5.2 blocks.
Mad Hatter said:Murphys law is always waiting to prove itself yet again.
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