How much hp will a stock 5.0 block handle

blacksleeper · May 15, 2007

Well I guess it's kinda late to ask this but after i got the blower bolted onto my freashly built 347 i was told that a stock 5.0 block will only hold up to about 900h/p before cracking in half is this true? If it is before I break it in i might buy the new sportsmans block. Just want a few more opions. I should have around 800 at the crank.

gcwh02 · May 15, 2007

if your pushing 800, you better get a dart. Everyone will recommend not going over 500 to the wheels with the stock block ( a lot of people do, but its their car so its their risk).

12Pack · May 15, 2007

I know a guy with 650 to the wheels on stock block. But that has to be pushing it. Deff go with a dark block.

Bullitt347 · May 15, 2007

With that kind of H.P. it is only a matter not of If but WHEN it is going to bust wide open. The Dart block is an excellent piece, but so is the new Boss block that Ford just released. In fact I think the Boss block is cheaper. Either way you cannot go wrong.

jammer84_03 · May 15, 2007

search..... 500hp and your pushing it then, throw a power adder and your living on a prayer. some make it a while, others go for a long time. you never know. a prepped dss block is te best for the long haul though

millhouse · May 16, 2007

800 h/p is WAAAAAY over the limits of the stock block. The typical numbers thrown around are ~450-500 h/p at the wheels in regards to the blocks limitations. Some have gotten away with more while some less. Given 15% drive train loss and your looking at 680 at the wheels. At those levels the minimum you'll need is a 351 block. The far better choice is going with a dart sportsman block however.

BK_CAULEY · May 16, 2007

millhouse said:
800 h/p is WAAAAAY over the limits of the stock block. The typical numbers thrown around are ~450-500 h/p at the wheels in regards to the blocks limitations. Some have gotten away with more while some less. Given 15% drive train loss and your looking at 680 at the wheels. At those levels the minimum you'll need is a 351 block. The far better choice is going with a dart sportsman block however.

yep. i busted mine and it was dynoed at 445hp. but it was a D.D. also.

Flavadave4 · May 16, 2007

Over on Turbomustangs dot com.......you will see a thread devoted to stock blocks being split in half. Most over there will tell you they bust at the 500hp level. Many have made more with stock blocks and have yet to bust.

I would be sick to my stomache to spend good money on a ticking time bomb!

BK_CAULEY · May 16, 2007

Flavadave4 said:
Over on Turbomustangs dot com.......you will see a thread devoted to stock blocks being split in half. Most over there will tell you they bust at the 500hp level. Many have made more with stock blocks and have yet to bust.

I would be sick to my stomache to spend good money on a ticking time bomb!

first hand experience...IT SUCKS

r.barn5.0 · May 16, 2007

I have a friend that is making 800rwhp
on blown DSS 347 on stock block, but we both know
its living on borrowed time.

Most people say do not exceed 400-450rwhp on stock 302 block
if you want it to last.
beyond that and its a ticking bomb

blacksleeper · May 16, 2007

I was just looking at the new boss 302 block i think for the price thats the way i need to go

Sicarius428 · May 16, 2007

Agreed. 450-500 is about the limit. After that people are extremely lucky or are on borrowed time.
Kevin

Flavadave4 · May 16, 2007

blacksleeper said:
I was just looking at the new boss 302 block i think for the price thats the way i need to go

Seems like a nice product, not cheap though. Talk to rick91gt (RNH Motorsports) he could tell you exactly what you want.

mattsclean90 · May 16, 2007

I have exploded two different stock blocks in the past 3 years or so. The last one was a stock 90 5.0 block that was turned into a 306 with a Novi on it. It made 467rwhp and it busted the main caps and split right in front of the starter. The other one was a DSS Pro Bullet 331 N/A car that made 432rwhp. I think that the rpms of the 331 with the N-91 cam is what killed it. The car lasted about 2 1/2 years through hundreds of wide open 1/4 passes. It had the DSS main support system on it but it still busted a main cap and broke the main support. That let the crank move which in turn broke the end of the crank and busted the front of the block as well. I think that a stock block that is prepped right and is kept under 6,500 rpms will last for a long time if the hp level is under 550 flywheel hp. I personally am not going to run any more stock late model 302 blocks from now on with any new power adder cars I build. I have a few friends with Ford Sportsman blocks that are having real good luck pushing around 600-800rwhp with street cars.

Modular2v · May 16, 2007

this issue has been beaten to 4 deaths! The real answer is.....ITS A CRAPSHOOT! Some blocks split at 390hp while others survive seasons at 600hp! Want insurablity????? get an aftermarket block or upgrade to a windsor!

TheUser · May 16, 2007

jammer84_03 said:
a prepped dss block is te best for the long haul though

says who? DSS uses stock blocks, so theirs aren't any stronger than a stocker. The only thing is they may put a girdle on it to hold it together after it breaks.

Besides, It's been posted on here several times within the past couple years...DSS isn't what they used to be. They've let their publicity go to the head and quality go out the window...that's according to several threads on here. I have no personal experience, but I wouldn't buy from them just based on what I've heard. I certainly wouldn't say theirs would be up for the long haul if they're still using the stock block. If you went w/ their dart or something, then yeah...

How much hp will a stock 5.0 block handle

blacksleeper

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gcwh02

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12Pack

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Bullitt347

I have been doing it wrong this whole time

jammer84_03

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millhouse

BK_CAULEY

it's built for speed not longevity, woman

Flavadave4

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BK_CAULEY

it's built for speed not longevity, woman

r.barn5.0

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blacksleeper

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Sicarius428

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Flavadave4

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mattsclean90

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Modular2v

TheUser

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