quote:Originally posted by "72 GTS:
Thanks to all
But i have to run stocks heads to be FIA legal,
Even if some guys run 7Liters engines and claim to be within the rules
The engines here can be tested for cylinder volume with a gauge that gets installed to the spark plug hole in the head.
7 litres in that engine is going to have issues with high speed (rpm) durability. Your 5.7, to a much lesser degree, if at all.
You don't even need a steel crankshaft. The steel is used more in a race engine to reduce the amount of bearing embedment into the crank journals. It is harder and will take less rebuilds than the iron crank will because of that, but the iron dampens vibration in the engine better.
A steel crank in a Cleveland will crack the block eventually through the main webs. Usually on the thrust bearing bulkhead.
The best way to build a Cleveland is to use the iron crank and have it Tuftrided. The process hardends the bearing surfaces but the crank retains it's flexibility.
The only issue with it that I am aware of is that you need a crank press to straighten the crank after it gets done. That machine is in short supply. Usually has to get sent out to have that done to one of the few shops that has the press.