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DOHC 4v - Stock forged Cobra crank or aftermarket?

3437 Views 11 Replies 6 Participants Last post by  Collinsautomotive
I'm just trying to get a better idea of when its necessary to upgrade from the stock Cobra crank?

I run a cog drive Procharger now, its x2 keyed, with an ATI dampner, and the everything was balanced precisely. But I'm starting to see more and more guys snapping off the snouts of the Cobra cranks, mostly guys running the big twin screw blowers - Whipple and KB.

Starting to think that the cog really beats up the motor and I am really putting the entire motor on the line everytime I'm at the track with the car. If the crank broke and the chains came off and I lost timing, the entire motor could end up junk.

I'm contemplating a move to a big, single turbo 88mm+, and I just want to figure out if a move to the new Boss 5.0 block is necessary (Teksid now), and if I need to upgrade to a stronger forged crank, or possibly a billet piece.

I would probably turn out the #'s I make now with 5 less psi thru an 88, and it will be much easier on parts.

I know Joey Bridge goes high 7's with a stock Cobra crank and a Teksid block, so it seems like there may be no need to re-invent the wheel here - just have it assembled by a pro, and go race.
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u would have to go with a bigger cid to spool that turbo i was goin to put a gt 47-88 on my 298 cid cobra manley i beam rods mahle extreme duty forged pistons 8:8 to 1 and i was told i wouldnt make shit at low rpm but once u get up to about 7000 to 8000 rpm the motor will finally come alive just my 2 cents
im saying y go through to that when u can run two 62mm turbo still spool the turbo faster than the 47-88 and still make wicked power down low with minimum lag and continue to build power at the top end
top end fabrication can build some when i talked to them about some headers for mine they said they have been building alot of ford racing shorty headers and putting a v band on them and the headers look amazing for 3 times less that turbo headers
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