Fabio421

Please forgive me if this is the most rediculous question asked in awhile. I am assuming it has been thought of and doesn't work. It never hurts to ask. I have never had the oportunity to really look at an S-4 engine.

I know that the blocks were the same throughout the years although bored out as the years progressed. Is it possible to upgrade a 4.7L to the 4v heads? Are the intake ports in the same location/ If so are the bolt patterns the same? I know the exhaust pattern is different.

I am not inquiring about the engine management, only if its possible to swap heads and exhaust.

Thanks

Jim bailey - 928 International

nope

Vilhuer

Blocks are not the same. 4.5L and 4.7L have smaller bore average outside diameter than 5L and 5.4L. Still, it should be possible to install 100mm pistons into old style blocks. Its just like making 104mm stroker from 5L or 5.4L. Some blocks do not have enough material in them while others have, barely.

Fabio421

Well it sounds like you have real world experience with this. Everything I have read says that they are the same.

Thanks

Vilhuer

I have seen few but not so many to make absolute claims that all 4.7L are smaller than all 5L.

mark kibort

scots is a 5 liter out of a 4.7 euro. there is near 5-6mm of cylinder wall left

Vilhuer

If it were typical 5L block there would be 7-8mm wall at 100mm bore size.

mark kibort

then, after a 1.5mm bore at the edge, a normal 5 liter ends up at near 6mm for the 6.5 liter stroker. Plus, if you notice, the headgasket is about 1mm wider than the bore. doesnt seal against much meat does it?

mk

Vilhuer

Not too much but much more than what 4.7L would have left.