I have a 305 TBI with just exhaust. i accidentally overshifted the other day and the tach went to 5500. motor didn't sound too bad. but redline is 5K, wondering how far a 305 will go before any problems will occur. as i found out my car doesn't have a rev limiter, and don't wanna hurt the motor if something happens again. thanx

 

i don't unserstand what you mean by overshifted? you downshifted and revved the engine too high? or you missed a shift and revved it really high? i don't understand, but you're not going to ruin your engine by revving it past 5500 unless you hold it there and try to blow your motor on purpose

 

i was racing this stupid import on the freeway, and when i went to shift up into 3rd my B&M shifter needs to be adjusted so it shifted through 4th in to neutral with my foot on it. so it tached up to 5500 floored before i could get off the gas. only reason i ask is because i've read about 305's spinning to 6100, and wondered if they did this with any problems or if it was a better bottom end to hold it.

 

Im not an expert, but I'm pretty sure the valvetrain would be your rpm limiter in a stock longblock. The valve's will float long before engine damage would occur. 350's run the same stroke with bigger pistons up to 6000rpm i believe, which means a rotating assembly with lighter pistions(i.e. a 305) can easily spin the bottom end that high, and probably higher. Ignoring the valvetrain, my opinion is a 6500rpm limit. Your 305 isn't any stronger, just lighter weight, which makes all the difference when it comes to rev limits.

As far as no-load revving, I'm sure you could break your motor if you tried to, but a brief visit north of 6000 SHOULDN'T hurt. Loaded(in gear) the power will die off(due to valves floating) and you'll wanna shift before you get into dangerously high rpm. If your gonna break it due to rpm, it'll probably be in gear, and you'll have to fall asleep to shift THAT late.

I'd just adjust your shifter properly to prevent this from happening again, and practice practice practice. My motto with cars=If it happend once and nothing was done to prevent it from happening again, it will happen again.

 

If you have a better bottom end with ARP studs and rod bolts as well as X-rods and forged crank, with the proper cam and valve springs 7,000 RPM is not detrimental.

 

You'll be fine. I had a TBI truck that had a factory rev limiter that was set at 5500. I dont know if the cars have that, but with that thing you could hold the pedal to the floor and it would tach up to 5500 and just stay there. I used to floor it sometimes in neutral just to see what would happen. Sort of a way of getting my aggressions out without doing any actual damage.

 

mine hit 5500 to when my tranny was slipping, so there is no harm even once my shift kit gets installed when i can manually shift holding it to 5500 rpms? 5000 seems like a desiel redline

 

floating valves is a good way to introduce pistons to valves.

5500 isnt so bad, in fact, im suprised it could breath enough to go that high