[Blue]

How do people come up with there horsepower ratings? I think 95% of them are bullshit. I am tired of looking at a 454 with an aluminum intake/ headers/cam telling me its 550HP. If you read honest dyno reports BB strokers,singleplain,jesel,1050 dominator,aluminum head motors are making 550-650 honest HP.

Sorry for the rant but it takes big $$$$ to make big power and I bet alot of people are off there HP rating by at least 100 or so. At least the people I have talked to lately and dealt with.

[pw_Tony]

I actually do like the extended impeller RPM charts/HP. Decently accurate without having to dyno your motor, and of course people only look at the corrected numbers after a dynotune

[hotrod56cars]

How do people come up with there horsepower ratings? I think 95% of them are bullshit. I am tired of looking at a 454 with an aluminum intake/ headers/cam telling me its 550HP. If you read honest dyno reports BB strokers,singleplain,jesel,1050 dominator,aluminum head motors are making 550-650 honest HP.

Sorry for the rant but it takes big $$$$ to make big power and I bet alot of people are off there HP rating by at least 100 or so. At least the people I have talked to lately and dealt with.

Talk to different people.

But I am surprised that you don't believe a 454 can't have 550 HP with a aluminum intake, headers, and cam. That BB stroker needs a different engine builder.

[pw_Tony]

Talk to different people.

But I am surprised that you don't believe a 454 can't have 550 HP with a aluminum intake, headers, and cam. That BB stroker needs a different engine builder.

Depends if you're talking real world or magazine/internet add a HP math

[hotrod56cars]

Depends if you're talking real world or magazine/internet add a HP math

 

A stock LS6 had a under-rated 450 HP, you don't believe that adding a modern aftermarket cam, aluminim intake, and headers will make 550 HP?

[pw_Tony]

A stock LS6 had a under-rated 450 HP, you don't believe that adding a modern aftermarket cam, aluminim intake, and headers will make 550 HP?

I don't believe a stock 454, even with higher compression, will make that power. Ls6 already came with a spiffy cam, lifters, so adding an intake and carb, or different cam all together, won't get 550

[429heads]

Here is 454 Chev motor that is race built they didn't even use one Chev part all after market,
why? Only made 662hp all after market parts.  What does it take to build one with a stock block and crank to make 600 hp this is
from the pump gas shootout popular hot rodding winner took home $ 27,000 and it to was
a small block and no parts built by Chev 673 hp all after market. Would like to see a Dyno run on Chev parts,block,crank
,  Ford 403cub in  400 Ford block, 400Ford crank =672hp and not race shop built man, wife, two kids.      I think some Dyno test, flow bench test and sales adds are like a women they will tell you any thing to get the money, and laffffffff all the way to the bank   No they had to turn 400 sbc 5000 to get 552hp out of it race built motor. not
chev motor a after market clone.

[hotrod56cars]

I disagree.

[2savage4you]

Chebby beat up Ford  

2sav..........shit starter

[Blue]

I have to disagree with the LS6 making 550 real world HP. Even watching Horsepower TV, headers,ignition,exhust,intake,etc. is good for about 35HP and costs ($1600) Im sorry but an extra 100HP is hard to swallow with a couple bolt-ons.

[ryanbrindle]

Chebby beat up Ford  

2sav..........shit starter

I think what he was saying was that the chevy didnt have a thing in it that was actually chevy but the ford used a ford block and crank to make killer power.   

[FORKEDUP]

so my naturally aspirated bbc does not put out 1500hp like i was told, damn i need to quit being so gulable ,  hp ratings seem to almost be a part of the game, it is whoever is the better liar, just like top speed, you never know for sure

[SLCKREG]

rpm's/impellers tell no lies

[countryboyaustin]

I have a 1976 eliminator daycruiser with a 454. I have the original stock specs on the Hardin marine motor and it tells me that my boat is rated 367 hp It has 990 chevelle heads with the big ports and is 8.8:1 compression. It is my understanding that to bring that 367 up to 500 hp with bolt on parts would cost a huge amount of money. Like well over 3k

[AQUAHOLIC]

i know what you are saying. my VR4 put 410 to all 4 wheels last time i dynoed it so that is roughly 500 at the crank. and i have about 30k invested into the motor alone. (dont ask why) if anyone on here wants to trade for a late 60s muscle car, i am down. anyway i get these fast and furious guys that tell me there civic is putting 350 to the wheels with no turbo and no matter what points i bring up to prove them wrong i cant convince them they are full of shit.

i wish i could carry a dyno around with me to prove these idiots wrong. i would love to see there face when there civic lays down 80 hp to the wheels...

[OC2Vegas]

i know what you are saying. my VR4 put 410 to all 4 wheels last time i dynoed it so that is roughly 500 at the crank. and i have about 30k invested into the motor alone. (dont ask why) if anyone on here wants to trade for a late 60s muscle car, i am down. anyway i get these fast and furious guys that tell me there civic is putting 350 to the wheels with no turbo and no matter what points i bring up to prove them wrong i cant convince them they are full of shit.

i wish i could carry a dyno around with me to prove these idiots wrong. i would love to see there face when there civic lays down 80 hp to the wheels...

Ask them if the have the stock half shafts.....when the say yes tell them the HP is full of crap. Stock ones shatter around 250hp at launch...I have seen it many times! 

[AQUAHOLIC]

ya i know. i had to convert to 1000hp carbon fiber drive shafts on my car. and those were not cheap. but when you are doing an oil change they look pretty cool.. haha..

[beerjet]

rpm's/impellers tell no lies

Your right , but tell it to everyone else that dont have a motor to dyno . Assuming your pump (of course this is all realative) is fresh and tight enough to kick out a correct number , it will within reason , get pretty close to a suggested HP number . The 2006 engine masters chevy 505 kicked out 8 hundered sum odd HP , on a dyno , with multiple runs , judges , and several of the other engine buliding competitors watching , and a spec proving tear down afterward to prove it all . I guess that might not be enough though .

There are no secrets out there . Take a claimed motor recipe and build it , find out if it's true . Ralph made a great point about buying a gasket set to see if what your buying is correct . Spend a few bucks (after all , this is HP we're talkin about) on some dyno time and make sure that the muther fuker is sellin  you every last bit of HP he's got . < --- (period)

-beerjet-

[pw_Tony]

Your right , but tell it to everyone else that dont have a motor to dyno . Assuming your pump (of course this is all realative) is fresh and tight enough to kick out a correct number , it will within reason , get pretty close to a suggested HP number . The 2006 engine masters chevy 505 kicked out 8 hundered sum odd HP , on a dyno , with multiple runs , judges , and several of the other engine buliding competitors watching , and a spec proving tear down afterward to prove it all . I guess that might not be enough though .

There are no secrets out there . Take a claimed motor recipe and build it , find out if it's true . Ralph made a great point about buying a gasket set to see if what your buying is correct . Spend a few bucks (after all , this is HP we're talkin about) on some dyno time and make sure that the muther fuker is sellin  you every last bit of HP he's got . < --- (period)

-beerjet-

I agree 100% Omar

[beerjet]

I agree 100% Omar

I have a mechanic I take my shit to because I dont trust myself with vehicles that I depend on , on a daily basis with . We started talking jet boats and he told me pretty much exactlty what a jet pump does anyways . There's no way around it .

And he's a big time Mopar *** . God bless him .

-beerjet-

[crewchief22]

It really doesn't matter to me what the total HP is, as long as I can convince my insurance that it is only 230HP.

[GlassCutter]

I know you guys like to handicap yourselves with BBC and BBF but I don't see why 500HP is so hard to find with low tech/low budget means.  The motor we put together for my Road Runner ten years ago used "smog" block and heads. Most builders use 2.18/1.81 inch valves then port for more power.  Flowbench testing showed great flow with smaller valves so we use Ferrea 2.14/1.74 in late model 452 heads.  It works out to a flow balance of 77-80% between intake and exhaust.  That is well prepped race car territory folks.  
Stock iron heads, Eagle rods to get the right ratio, 9.75 cr Diamond (off the shelf) pistons, Holley Street Dominator manifold (again smog) and a solid cam 284/294 and 540/560 lift, 750 Holley carb and 473 cu in. got us 500 ft lbs of torque from 3000-5600 rpm (535 at 4500!) and 540 hp from 5500-6500rpm.  It is all about careful selection of parts.  Ford guys could probably do this but I don't know about you Chevy guys cuz the factory doesn't give you all very good crank/rod/cam geometry to work with.

[hotrod56cars]

I find it difficult to believe that a cam that was designed in 1969 (LS6 came out in 1970) can't be improved enough to get a extra 100 HP with the addition of the newer cam, headers, intake, and some jetting. Seriously, I have no idea what duration and lift the LS6 had but figuring on when it was designed it can't be that great of a cam as compared to today's cam profiles.

But hey, no argument here. A BBC with a new cam, headers, and intake max's out at 549 HP and 550 HP is just a flat out lie and BS. 

[pw_Tony]

I should rephrase. I DO believe it is possible to get 550hp, with enough Cam and RPM. I DON'T believe it is possible to get that power at a lower RPM like these jet boats like. What's the peak flow on a stock oval port and cast iron head anyway?

[Blue]

Besides when I built my motor I wanted a flat,high torque curve. It's cool to say I have 722HP but that was at 7400 on the dyno. I am most proud of 658ft.lbs. below 5700rpm. Torque is way more important in my book