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Discussion Starter · #1 ·
Can I use the Heads off my 04 Mach 1 engine on a 1998 5.4 liter short block that is fitted with DOHC pistons ?
 

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Discussion Starter · #3 ·
They use the same pistons ,5.4 has a longer stroke and taller block so a spacer is needed to put a 4.6 Mustang style intake manifold on a 5.4, other than that I think they are pretty much the same , dont think there is any thing special about 2 valve 5.4 heads , guess I could get them ported but my 4 valve heads are done & work well , bunch of money tied up in them with the cams & CNC work
 

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ME Bloodhound
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The heads bolt up the same. The 5.4 is basically just a 4.6 with a taller deck height for the longer stroke. It is a slightly wider block, but that affects the intake manifold rather than the heads. The 2007-2012 GT500s are a 5.4 with 4v heads.
 

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Discussion Starter · #5 ·
I was thinking a 5.4 bored 40 over with a built bottem end with my 4v heads & a twin turbo set up would Rock in my 2004 Cobra , already have a 5.4 block with steel crank might as well use it, I have a 04 Mach 1 engine with nitrous in it now
 

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Discussion Starter · #7 ·
What do you mean ? If a cylinder wall got scored there wouldn't be enough left to fix it ? I don't have to bore it at all , there's no wear on them but I was thinking if I'm gonna buy new pistons might as well go bigger , maybe I'll do 20 over then . Thanks for your input
 

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ME Bloodhound
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Boring is 10, 20, 30, or even 40 realistically is not going to make any difference in power. It is just thinning the cylinder walls. If you do a twin turbo set up it would be better to have a bit thicker cylinder walls. If you don't have to bore it for anything then i wouldn't. Just hone the walls and call it good. If it is scored from something, then bore it a bit.
 
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