No, you beat them in with a hammer with the head off the car and the block still in and distort the cylinders and mess up the head gasket mating surfaces.

Block guards are a waste of time and money. As long as the tune is good and detonation is eliminated, there really is no benefit of having a block guard since stock sleeves can hold plenty of horsepower.

 

so your telling me that pushing 400-500hp on stock sleeves isn't going to cause them to sway?.. i highly doubt this.. they are gonna move, the block guard will hold them from swaying

Theres no way you can compare how tight it is when the engine is cold to what it was like when u'r boostin & the engine is hot & the thing loosen's up & drops

 

Tell me your atleast going to deck the block after you tig in your blockgaurd Tony.

 

http://forums.evans-tuning.com/viewtopic.php?t=1376

The detonation from a shitty tune will kill it regardless of whether you have a piece of metal reinforcing the cylinders or not. The swaying is very minimal.

But if it makes you sleep at night...h:

 

no shit, but regardless if it's a perfect tune or not, it's nearly impossible to expect the cylinders to not try & sway when producing 400+ hp on stock sleeves when the crank is thrusting the rod & piston agains the cylinder walls side to side. the amount of heat & mass moving will cause the cylinders to sway. Yes the tune is a big factor here.

Detination increases cylinder sway. so if you can get a perfect tune. then you lessen your chances, but there will still be movment. That is the reason for taking up the space with something so that the cylinders are unable to sway.

had it re-surfaced, not decked. I didn't want it to raise my compression at all. I'll have the pix up soon. The welder did a hell of a job on block guard as well as the machinest after the welder was done.

 

Guys running 500 whp with a good tune on stock sleeves don't worry about sleeve movement because it is so incredibly minimal. It isn't enough to crack a sleeve.

 

any sleeve movment is horrible. If it doesn't crack the sleeve, it will wear the head gasket down because the head isn't going to move with the sleeves and it's going to cause it to rub & eventually fail.

Block Guard FTW!

or say enough & sleeve the block! even better!

very good discussion

 

I agree. Good discussion.

I want some evidence of headgasket failure without a block guard on a heavily boosted stock sleeved motor. Until then, everything I have heard from experienced engine builders says that isn't an issue.

 

im going to be running a block guard. almost wish i didnt but ill wait and see. epoxy has not been done very successfully. someone destroyed there motor because of it

 

Concrete is the "old-school" domestic drag way to do it.

This is for track only cars that DO NOT run for more then a few minutes at a time. Don't do this to a street car's engine or you will suffer serious cooling issues within ten minutes of starting the car.

Just so everyone knows.