Mark 8 shortblock.

[Torrbo916]

So I came acrossed a deal on a bottom end from a 98 mark8 with 70k on it($100). It's aluminum. Is this worth the time and effort to tear down and re assemble for my gt. What are the pros and cons. Any common issues with the aluminum block. Would I be able to use termi heads and an 03 timing set on this. Is everything pretty solid on these as well. please help.

 

[Mystic SVT]

Mark VIII motors use the same teksid block as 96-99 cobras, this block will handle up to 1500hp. The crank is the same as a gt crank, its cast not forged like the cobra piece. If you're looking to rebuild it then yes its def worth it for $100, you'll end up with a lighter block. Then internals on the mark viii are basically the same as a gt so you won't gain anything there.

Any 4.6 block will accept 4V heads and timing gear.

 

[massacre]

You can use the Terminator heads but like I told you on corral(assuming it was you), the timing chain guides(non-fixed) between the two motors are different. If you want to use the Terminator timing set, everything else will work but the curved guides attach to the block differently. Teksid uses a bolt/bearing arrangement, while the '03 uses a pivot pin arrangement. You can just buy the pins and thread them into the block and use all the '03 stuff.

Make sure to use the correct crank gear/trigger wheel arrangement also. Thick gear/thin wheel, or thin gear/thick wheel. Thick gear and thick wheel will not fit behind the timing cover.

'98 MarkVIII should have the hi-flo oil pump, so you're good to go with that. The early Marks had a lo-flo pump that wasn't up to snuff. You'll have to make sure to use the Cobra pickup tube, the GT tube is too small and you will have a huge oil leak from the tube to the oil pump, not good. Not sure if the Cobra pickup tube fits the GT pan, you might need a Cobra oil pan also.

 

[MustangChris]

buy it. whether or not you use it is not important. I spent $300.00 on a damaged teksid and was pleased with the "deal."

to get the block and rotating assembly for $100.00 is a fantastic deal. go for it. if you change your mind, you can sell the block for $200.00 profit and the internals for $75.00.. . .. . :-D