madmike9396

iTrader: (29)

Just wondering what the weak points are in the bottom end because me and a friend are putting one in a toyota truck how high can we spin this motor safely ? Thanks to anyone with info

robsquikz28

iTrader: (246)

weakest point are the rod bolts and you still can spin to 6700 effectively but all engines are different you can say some were touched by god before leaving the plan and can take abuse like all hell while other will blow up with no abuse....

Wicked94Z

iTrader: (26)

pistons aint so hot either

myltwon

iTrader: (1)

rod bolts basically. then after that pistons, then rods, then crank

speed_demon24

iTrader: (6)

How did you come to that conclusion?

trippinholyman

probably by throwing them across the bottom end of the block

94Z28rag

iTrader: (10)

I always thought that was a pretty well-known and agreed upon fact about the LT1s.

AChotrod

iTrader: (17)

I also agree about the rod bolts stretching.

myltwon

iTrader: (1)

because in my 150k mile motor the only problem was a pair of rod bolts that stretched and caused me to eat a bearing up?

that motor had been sprayed, used, and abused. every other part of the motor was in great condition outside of specific parts damaged related due to domino effect.

not trying to say everyone who revs their car to 6400-6600rpm is gonna have the same result I did, the OP asked for the weakest point and it seems to be the most common point of failure in stock RA lt1's that let go. it's not often you see a spun main bearings, snapped crank, bent rods, etc as the source of a failed motor with stock lt1's

robsquikz28

iTrader: (246)

yep its a well know fact that the rod bolts stretch like hell and are the weakest link

1badzee

iTrader: (12)

Weakest link(s) : Rod bolts, rods, pistons, crank, main caps. If you're going to spend the time and money to rebuild it, why not put some stronger parts? It's worth waiting the extra time to save more pennies

AChotrod

iTrader: (17)

1badzee you think the stock pistons are stronger than the stock rods??

1badzee

iTrader: (12)

What? No lol. That wasn't in any kind of order. I was making a funny, basically listing the entire rotating assembly being the weakest link =P Plus in my case, yes. Stock 93 rods are much weaker than 94+

djjab57

iTrader: (17)

Im in the process of building a block for my 94 Z and am using a 95 block with stock rods and crank out of a 95 vette turned and balanced of course. I am upgrading the bolts to ARP's and the pistons because the research ive done tells me they are the weak part. Just dont know what pistons im using yet though

AChotrod

iTrader: (17)

LOL! K got ya!! My 355 is stock crank & rods, speed pro forged pistons ,arp rod bolts and clevite bearings.

baylove

iTrader: (35)

+1 absolutely right

djjab57

iTrader: (17)

Sorry for the high jack, BUT can you tell me where you got those pistons from and what you paid? and a link if possible

madmike9396

iTrader: (29)

thanks guys i will probably replace the rod bolts and set the rev limiter to 6000 and let her rock. Soon as we get a truck and start the project i will post up pics. Lt1 T56 toyota on the way. Heart beat of Japan lol

ss.slp.ls1

iTrader: (36)

That's what I am going to build.

So are you keeping the stock cam? If you are setting the rev limiter to 6k, I don't think you'd need to touch the bottom end at all...

1badzee

iTrader: (12)