Block Limitations

ace940

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Oct 16, 2011

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Jun 25, 2012

#1

• Jun 25, 2012

• #1

im sure that this has been asked many times before but here we go. how much power can the stock 302 block withstand? ive heard 500 hp but ive also heard that the internals can handle that much power too. so that beggs the question why build a stock block if the block will split at the same power as the internals can handle. does the boss block handle more power? what about 351s?

 

ace940

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Jun 25, 2012

#2

• Jun 25, 2012

• #2

im asking this because one day i want to turbo my car but i dont want to push the block too hard and really screw myself over.

 

Noobz347

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#3

• Jun 26, 2012

• #3

...and you're asking in the wrong forum.


Moved thread to Talk

 

ProKiller

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#4

• Jun 26, 2012

• #4

there is no certain number that all of sudden will break the block. i'm at 500 rwhp on a stroker with a factory block and it's held for years now. the general rule of thumb is 500 but that's not a law.

 

94blackcobra

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Jun 26, 2012

#5

• Jun 26, 2012

• #5

The general consensus is that 500 is the limit. Some have pushed it for more, whereas others have failed with less. A Boss block should be good for 1000+hp, but be ready to spend some serious $$$ to have one built. As far as why build up a stock block, the answer is simple: it can be done relatively cheaply - stock block 302's are a dime a dozen. Even though you will be limited on power output, 500 hp at the wheels is no joke.

 

JJ95GTID

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#6

• Jun 26, 2012

• #6

Roller 351 blocks are supposedly good to 700hp. That's per FRPP catalog from a couple years back.

 

revhead347

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#7

• Jun 26, 2012

• #7

It depends on how you make hp. Turbo and a good tune and 500rwhp shouldn't be a problem. It depends on how often you give it the beans and so forth. Most people build a stroker with a stock block. Even with a turbo kit you can have a fun ride at 500rwhp. If that's your goal, then I'll welcome you to the brake s#*t club. Cars with that much power brake stuff constantly. Don't think it's just about the engine. With a turbo stock block to the limit, be prepared to spend good money on a transmission and rear end. My last stock block 347 made 492rwhp/635rwtq and lasted 10 years and 85,000 miles before the thrust bearing wore out.

Kurt

 

ace940

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Jun 26, 2012

#8

• Jun 26, 2012

• #8

how much boost would i have to run? assuming i would go for 500 hp? i would assume like 14 or 15 psi? and would i have to get a megasquirt or a piggyback to be able to tune it or can i get the stock ecu tuned

 

Gearbanger 101

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#9

• Jun 26, 2012

• #9

How hard you'll have to push your turbo(s) will depend on what you're working with. A stroker, with good H/C/I is going to require a lot less effort from your compressor than a basically stock engine.

 

revhead347

Apparently my ex-husband made that mistake.

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#10

• Jun 26, 2012

• #10

ace940 said:

how much boost would i have to run? assuming i would go for 500 hp? i would assume like 14 or 15 psi? and would i have to get a megasquirt or a piggyback to be able to tune it or can i get the stock ecu tuned

Click to expand...

Yeah, it really depends on the heads and stuff. The less the restriction, the lower the manifold pressure will be at the 500rwhp mark.

Kurt

 

94blackcobra

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Jun 27, 2012

#11

• Jun 27, 2012

• #11

I know a guy who just split his DSS 331 block with an On3 turbo kit. The point is make sure you know what you are getting into with a turbo install. As far as tuning, you can get it done with a plug in chip like SCT or a Quarterhorse.

 

revhead347

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#12

• Jun 27, 2012

• #12

DSS doesn't make blocks.

Kurt

 

94blackcobra

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#13

• Jun 27, 2012

• #13

My bad. He bought the short block from DSS. Either way, it split right in half.

 

Bullitt347

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#14

• Jun 27, 2012

• #14

The HP you can make safely with a stock block is mostly with the tune and the rpm's of the engine. If the engine does not rattle (detonate) and the rev's are kept under 5,800 rpm you would be surprised what a stock block can take. But let it rattle once and you are done.

 

Rick 91GT

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#15

• Jun 29, 2012

• #15

Bullitt347 said:

The HP you can make safely with a stock block is mostly with the tune and the rpm's of the engine. If the engine does not rattle (detonate) and the rev's are kept under 5,800 rpm you would be surprised what a stock block can take. But let it rattle once and you are done.

Click to expand...

There is a lot of truth to that statement.....

Stock blocks are truly hit or miss, brokem them NA with 350RWHP and 7800rpm and had them last through 540RWHP/740RWTQ at 6700rpm N2O.

Just so you have an idea...

stock block based,Cast crank, forged rod and piston stroker shortblock is around $2000 (internals will take 600hp), make it forged crank $2500 (internals take 800hp), add a DART block and $4500(internals and block take 1200hp+)

 

Noobz347

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#16

• Jun 29, 2012

• #16

revhead347 said:

DSS doesn't make blocks.

Kurt

Click to expand...

Oh, but they do claim that their level *cough* (enter BS here) blocks take more HP than one that isn't level *cough* (enter BS here).

 

Bullitt347

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#17

• Jun 29, 2012

• #17

The whole reason why my 89' 5.0 has a (331 cid) Scat cast steel crank and "I" beam rods is that I did not see the point in putting a 750 hp plus rated rotating assembly in a 500 hp (approx) rated stock block. It is also a way of keeping the car streetable. I will save the high HP and high $ rotating assembly for the high HP rated block. Once I go down that road, I am afraid the car will be more of a race only vehicle and I will lose the ability to realistically drive it on a daily basis.

 

revhead347

Apparently my ex-husband made that mistake.

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#18

• Jul 1, 2012

• #18

Noobz347 said:

Oh, but they do claim that their level *cough* (enter BS here) blocks take more HP than one that isn't level *cough* (enter BS here).

Click to expand...

Yeah, I'm not a fan either, but I wasn't going to say anything.

Kurt

 

Venom351R

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#19

• Jul 2, 2012

• #19

DSS blocks are just stock blocks. It is by no means an aftermarket block that can take anymore abuse then one you buy off craigslist.

 

ace940

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Feb 6, 2013

#20

• Feb 6, 2013

• #20

i forgot about this thread... lets say i was trying to do 400 to 450 hp with stock heads and intake would this even be possible with an on3 single turbo kit? they seem legit and i haven't seen anything bad about them.