Another big power V8 lifts its heads

[ArnieVXR]

Not mine, but one belonging to a nice couple I know that run a 10-second 6000lb Chevy pick-up. It's an LSX based motor, but didn't have the six bolt heads. It runs 1100hp on pump gas, although usually trucks around on a bit less. The old heads were a bit of a mess and the block took some damage in one bore. As a testament to the block, a simple rebore and bigger pistons has sorted it. Six bolt heads will be on in no time.

So the message here is: want to run big horsepower - then buy an LSX motor with six bolt heads.

[TheLeatherman]

Got to raise the question though - that any decent engine builder would insist on certain criteria like this if making a big hp motor. Only bodgers and amateurs would run the risk..... most of the engine builders I know won't cut corners even if asked to by the client (often due to budgets constraints of the customer) - as it is their reputation at stake.

[ArnieVXR]

To be fair, the original engine was built a long time before the six bolt heads became available, so it's lasted quite well. GM managed to get the LSX blocks to market well before any heads.

[stevieturbo]

If it's gona blow, it's gona blow 6 bolt heads or not.

Sometimes it's just that time.

People blow them with 6 bolts, wire ringed, larger studs etc etc....it just happens eventually.

1100hp isnt stretching 4 bolts that much, although if the truck is used hard...that's one heavy bloody truck to haul along.

Any pics of damage ?

When MLS gaskets blow on alloy parts....it usually seems to plasma torch things to bits !

[gsd2000]

6000 pounds is alot of weight, a vxr8 in comparison is around 4000 pounds

[ArnieVXR]

gsd2000 said:

6000 pounds is alot of weight, a vxr8 in comparison is around 4000 pounds

Fully spec'd up Silverado quad cab (leather, etc). Runs 10.9 on OEM tyres and the radio playing Country music. Tad faster than a 911 turbo and a tad slower than a Veyron.

And yes Stevie, I the damaged was described as 'plasma scorching'

[stevieturbo]

ArnieVXR said:

Fully spec'd up Silverado quad cab (leather, etc). Runs 10.9 on OEM tyres and the radio playing Country music. Tad faster than a 911 turbo and a tad slower than a Veyron.

And yes Stevie, I the damaged was described as 'plasma scorching'

Just seems to be an alloy/MLS gasket thing that.

Seen it happen on a few different engines. Really makes some mess. The heads at least are definitely repairable ( happened to me a few years ago and had to get them repaired )

Block...not so easily repaired if damaged.