how much hp can a stock block hold?550?

dannydoo · Nov 27, 2004

im inches away from pulling my motor and putting forged pistons and rods...but if this block cant handle 475 or upwards im gonna scrap it..
and have fun in the process with 26psi of boost ... theres always an option of those support sleeves that strenghten the combustion chambers too right?is that expensive?
i only want 500rwhp for starters..
the reason for the forged is i want to seal the headgaskets tight and not worry about the the rings and rods and pistons..
that will that crank hold up w/good studs?

wytstang · Nov 27, 2004

To make 500rwhp you have to make 600hp to the crank. 600 to the crank -17% drive train loose=498rwhp if my math is right yuo need at least 600 to the crank you need a stronger block.

dannydoo · Nov 27, 2004

ive seen stock blocks in magazines do over 500rwhp but they cant be lasting too long right?i was told those blocks cant handle cylinder pressure for long at all

wytstang · Nov 27, 2004

Well with the proper tune it's possible to last but for how long the cars in the mags are they DD or weekend warriors or srtictly drag cars what yours going to be? 26 psi is a lot how often is your car going to see that much psi?

YEAHLOH95 · Nov 27, 2004

it all comes down to how often your going to be in boost . my car has been together for 3 years with a stock bottom end and it sees 10 lb to 15 lbs every time i drive it on the weekends i have only had one blown head gasket and that was my dist fault . i f you are shooting for more than 475 at the wheels you will need a new block .i would bolt the t-trim on and see how it works out then go from there.

One Wicked SVT · Nov 30, 2004

The block can go 9's and has been proven, but how long and who tunes it is another story.

We have guys running mid 10's with a stock hypertectic piston block, others feel the need to swap pistons, others dont.

But my question to you is... WHAT makes you want to go 26lbs of boost?

That seems rediculous for no reason.

Swapping pistons have nothing to do with head gasket sealing. The rods and crank are pretty stout believe it or not, the main problem is the hyper junk pistons that may fail at any given point. This can be remedied easily with a set of forged pistons and gapless pistons for a tight seal.

The BLOCK will split before the internals go(most likely, if the tune is right on and you keep your RPM's conservative)

dannydoo · Nov 30, 2004

guys chill out! i didnt say i want 26psi all the time....i meant i would like to beat the engine to death w/26psi if im going to have to swap my block..

im figuring on 10-15psi of boost and using it cautiously.

the thing is when i start a project,i quickly get posessed into going extreme.
if i swap my pistons to forged i ll be happy..
i also heard lowering the compression will help u to revv higher is that true??????????and could be done by adding a ticker gasket or doublestack

my post was how much hp untill the block gives out?in case i do go extreme posessed??? causei dont want to do all that work into a poor block...

thanx

zenboy99 · Nov 30, 2004

My good friend has a 540rwhp Fox running 8 psi on the stock block. He's been running it for 3 months now without problems and revs it to 7000rpm at the strip. He's got a Dart block waiting at home for him though. I think he has a rare case, most people don't recomend going over 500rwhp.

demon40 · Nov 30, 2004

there is a company advertising in this months mmff that has produced 685rwhp (787 fly wheel horse power) with a stock block. but they have a steel main support girdle, and a lifter valley support girdle. their web site dosent work yet so you will have to get the new issue of mmff

One Wicked SVT · Dec 1, 2004

Lowering compression will not do ANYTHING with the REV limits.

Dropping compression will let you "safely" run more boost with pump gas.

Dont believe everything you read. I suggest you seriously start reading up and doing research before jumping into anything, people tend to say something that will end up costing someone money.

Most likely the stock internals will hold up longer than the block will.

Some make it through 600rwhp with no problem, others arent so lucky.

zenboy99 · Dec 1, 2004

One Wicked SVT said:
Most likely the stock internals will hold up longer than the block will.

I find that hard to believe. I've never heard of the block going, before pistons, crank or rods.

Drunk5oh · Dec 1, 2004

do it right the first time and get a good block from the start.

One Wicked SVT · Dec 1, 2004

zenboy99 said:
I find that hard to believe. I've never heard of the block going, before pistons, crank or rods.

Then I dont know what to tell you.

We did it plenty of times.... block was the first to split, but then again, we got one hell of a tuner on hand.

ProKiller · Dec 1, 2004

i've heard the stock block can handle up to 600 flywheel hp. anything over that is on borrowed time. If you want 500 rwhp, i would make sure that you have the main supports girdled and forged pistons. the internals will go long after the block cracks. the stock pistons, in most cases, are crap. if your running boost, low compression IS A MUST! if you want to see 15 psi, keep the compression down to at least 8.5:1.

One Wicked SVT · Dec 3, 2004

I am still standing on my factual proof of the block cracking before the internals.

how much hp can a stock block hold?550?

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