stock bottom end 5.3 safe max shift rpm's

[2007L33]

What are you cammed stock bottom end guys using for your shift RPM ? I know it depends on alot , But on average. I have 4 cars but this is my first truck and I'm kind of scared shifting my truck at 6500 as I do my GTO. My biggest worry is long hills when I travel or tow I don't want it sitting at 6000+ for 30 seconds. I am doing a comp cam 212/218 114 and was going to have the shift points at 6000 how do you feel about that ? The truck is lifted with 33's and 3.73 gears, headers, exhaust, cold air, 160 stat, comp 212/218 .530/.530 114 with nelson tune.

[TXsilverado]

6500 is still in the safe zone as long as your springs are up to it.

[DBRODS]

LOL...WOT runs up a hill with a trailor FTW!!!!!

[Madd Maxx]

The bottom ends on the LSx-based engines are pretty stout. Shifting at 6000 or a little higher won't be a problem. However, as you approach 6500, you may want to consider upgrading your rod bolts. They are the weakest link.

[2007L33]

LOL...WOT runs up a hill with a trailor FTW!!!!!

Well my Yukon denali has a Lunati cam and when I have the snowmobile trailer on the back with 4 sleds. On the interstate with the cruise set at 70mph it will sit at 5700/5800 and not shift till I crest over the hill I am on and there are some long and steep hills when I travel thru the PA mountains. That engine actually spun a rods bearing with 42,000 on it ? I put the cam in at 13k ?

As for the durability I know what they will take alot of abuse. I have a turbo GTO with a stock 6.0 with a 90mm front mount that makes 770rwhp and my 2000 camaro that has a 418ls3 shown in my avatar 9.60's N/A 135mph . I just feel horsepower from RPM's is far harder than nitrous and blowers as they are compressive loads. Just wanted to know what others are spinning with daily drivers ? Just because a couple people can run there engine 7500 doesnt mean its the right thing ? I like to take a consensus and make my decisions....

[Beatdown Z]

Well my Yukon denali has a Lunati cam and when I have the snowmobile trailer on the back with 4 sleds. On the interstate with the cruise set at 70mph it will sit at 5700/5800 and not shift till I crest over the hill I am on and there are some long and steep hills when I travel thru the PA mountains. That engine actually spun a rods bearing with 42,000 on it ? I put the cam in at 13k ?

Damn! I don't think I could ever do that to any of my vehicles. I get nervous when my brother cruises at 3500 rpm in his 5.3 Chevelle. WTF!

[Beatdown Z]

I would spin the 5.3 in my brother's Chevelle to 7000 rpm, if the tune would allow it.

[George C]

with that kind of cam you want you wont have to worry about high shifting, youll probably shift around 6100

[skeet]

7300 " FTW "

back down to "7100" stock bottom end

been running it forever!!


personally i wouldnt do it on a high mileage truck, but then yeah i probably would lol

[2007L33]

7300 " FTW "

back down to "7100" stock bottom end

been running it forever!!


personally i wouldnt do it on a high mileage truck, but then yeah i probably would lol

I'm the same way I guess truck has a 100k powertrain warranty anyway ? I bought a 2500hd 6.0 in 2002 and truck pulled it in the stock class for 4 years with 200hp nitrous on it and it never missed a beat. I sold the truck with 212k on it and it had exactly 302 10lb bottles thru it ! I have a friend I put a solid roller in his 01 camaro with an l92 carbed topend he spins it 7800 thru the traps. Its still together but its starting to rattle a little.

I get paranoid sometimes cause my first engine in my Camaro was a 408 I will not say who built it as I think they are a sponsor and its most likely nothing to do with them, But it was $5800 for the short block I went for the Lunati crank and Rods and wiseco pistons blah... blah.... Long story short I had a rod break just above the journal ? with only 20 passes on it shifting at 7000 no nitrous.