str8lnr

what is the safe rpm limit on stock 5.0 bottom end im not talking about heads and vavle float just bottom end max rpm are they good for atleast 6k

Timspony

...fuel cuts off at 6250, so I'd say your safe to 6200...but with a stock 5.0 your not making anymore hp after 5500 without a power adder!

str8lnr

im carbed witha single plane intake just windering if 6000 to 62 is safe on stock internals

woodsy

We have taken the bottom end 7200 many a times, eventually broke the snout of the crank

mjr46

i've had my 92 to 6000 many times without an issue

Gary H

Shouldnt be a problem. 6k shifts here all the time.

Joel5.0

Nothing is safe....... I've worked stock cases that have failed at 5000 rpms.... and run other stock cases that have withstood 6800+ rpms with no problems...... yet valve float DOES have a say in how high they can survive.

holyshift

Have bounced mine to 7 plenty of times when i had the 5 speed in,sucks when you miss a shift...,and my stock bottom end has about 110,000 on it...hehe

crusin92red5.0

i read in the mustang book the max horsepower is at 4250 rpm on stock mustangs

Portmaster

It should be OK. There are no sure things. The stock cranks are fairly decent but the weak link in the stock bottom end are the rod bolts. When a rod bolt stretches it distorts the rod cap and the rod bearing spins. If that thing still has the stock heads the peak power has already nosed over and its wasted rpm. If everything is stock but the intake and carb I'd be making those shifts before 5000 rpm. Tell us more about the car