BOTTLE ROCKET

iTrader: (4)

Anyone running a 5.3 bored to 3.9 and making decent power? (700-800rwhp)
Per my other post, I am building a LS1 for 770-800rwhp, and 13-15lbs boost, and have received lots of comments that a 5.3 bored out is too thin to hold the power.
Don't want to go to an Iron block, and just building something to cruise and play with. Not building a race car.
Thanks

justinkp

I'm curious also. My LS1 aluminum block held up to 765 until the bearings went after 1k miles. Sure it was a builder problem though.

Blown06

iTrader: (32)

I've run a 5.3 bored to 3.9 for over 4 years with 20+ psi no problems. That being said the aluminum 5.7 should last at 700-800 hp. If it doesn't it aint the motors fault........its the builder or tuner.

BOTTLE ROCKET

iTrader: (4)

That's great to hear. I will never run over 14-15lb (and maybe a little less then that) and it's not a track car.
I am being bombarded with guys telling me the bored 5.3 is too thin, and will crack with high hp and boost and I will HAVE to go with an iron block. I appreciate the advice, but I really don't want an iron block in a Vette if possible.

hellbents10

iTrader: (10)

We have done a couple that make about 800-1000.

HexenLord

I thought the 5.3 over bored to a 5.7 had the exact same cylinder wall thickness as a LS1 since the bore spacings are identical.

BOTTLE ROCKET

iTrader: (4)

They could be, Im really not sure of the specs. I have just received a tremendous amount of replies saying the aluminum bored 5.3 would crack, blow, etc. if I ran boost and big hp.

LS5.3stang

iTrader: (4)

aluminum 5.3 bock has steel sleeves ...... 5.7 ls1 blocks have spray on liners..... there a huge difference between the two...... i would build and run a 5.3.... there plenty of l33 5.3 s making that power with stock bottom ends....

BOTTLE ROCKET

iTrader: (4)

Thanks, That's good to hear
It will have good pistons, rods and rod bolts, so if the block holds, maybe it will be fine for the power I am trying to build.