HP Ratings

« **on:** May 22, 2008, 04:18:20 PM »

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.

« **Reply #1 on:** May 22, 2008, 04:21:51 PM »

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

« **Reply #2 on:** May 22, 2008, 04:25:04 PM »

Quote from: Blue on May 22, 2008, 04:18:20 PM

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.

« **Reply #3 on:** May 22, 2008, 04:35:55 PM »

Quote from: hotrod56cars on May 22, 2008, 04:25:04 PM

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

« **Reply #4 on:** May 22, 2008, 05:11:33 PM »

Quote from: pw_Tony on May 22, 2008, 04:35:55 PM

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?

« **Reply #5 on:** May 22, 2008, 05:31:31 PM »

Hearing those kinds of people talk helps you know when to raise the bs flag. I got a bone stock 350 that makes 800hp with a 2 barrel and cast iron exhausts and all I had to do was add some octane booster to my tank and put in some of those four pronged spark plugs. I'm running 8 flat in the quarter with it in my 67 caprice and a powerglide all original numbers matching! and yes it came with a factory 350 in 67 so mine is a one of a kind worth millions.....

yeah I've heard those guys too!!!

« **Reply #6 on:** May 22, 2008, 05:36:32 PM »

Quote from: hotrod56cars on May 22, 2008, 05:11:33 PM

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?

They changed the standards for hp ratings somewhere in the late 80's early 90's. Used to be SAE gross now it's SAE net. By today's standards I think the LS6 only makes 450hp. So a real 550hp is pretty hard get.

« **Reply #7 on:** May 22, 2008, 05:41:26 PM »

Quote from: hotrod56cars on May 22, 2008, 05:11:33 PM

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

« **Reply #8 on:** May 22, 2008, 05:51:00 PM »

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.

« **Reply #9 on:** May 22, 2008, 06:26:58 PM »

I disagree.

« **Reply #10 on:** May 22, 2008, 07:10:56 PM »

Chebby beat up Ford

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

« **Reply #11 on:** May 22, 2008, 10:19:44 PM »

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.

« **Reply #12 on:** May 22, 2008, 11:01:57 PM »

Quote from: 2savage4you on May 22, 2008, 07:10:56 PM

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.

« **Reply #13 on:** May 23, 2008, 07:18:41 AM »

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

« **Reply #14 on:** May 23, 2008, 08:11:54 AM »

rpm's/impellers tell no lies

« **Reply #15 on:** May 23, 2008, 08:16:17 AM »

Quote from: Blue on May 22, 2008, 10:19:44 PM

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.

I was saying that 550 real hp is HARD to get. In the 60's they rated them without alternator, water pump, a/c, smog pump, or any other accessories. With SAE net formula, they have those accessories hooked up when the factory gives out ratings. No way do I think a LS6 with just a cam and intake swap is going to make 550. The LS6 not only had a good cam to begin with, it also had a pretty good dual plane intake and rectangular port heads that flowed pretty good out of the box. It might be able to with all the right parts such as roller cam, port work, msd ign, step headers, single plane intake, etc. But then it would make all that power in the upper rpm range, not really a good jet boat motor. You would have to really do your homework to get to that. Most stock boat 454's are oval port motors and are closer to make around 350hp.

« **Reply #16 on:** May 23, 2008, 08:56:39 AM »

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

« **Reply #17 on:** May 23, 2008, 09:00:46 AM »

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...

« **Reply #18 on:** May 23, 2008, 09:07:10 AM »

Quote from: AQUAHOLIC on May 23, 2008, 09:00:46 AM

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!

« **Reply #19 on:** May 23, 2008, 09:59:12 AM »

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..

« **Reply #20 on:** May 23, 2008, 12:13:02 PM »

Quote from: SLCKREG on May 23, 2008, 08:11:54 AM

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-

« **Reply #21 on:** May 23, 2008, 12:33:23 PM »

Quote from: beerjet on May 23, 2008, 12:13:02 PM

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

« **Reply #22 on:** May 23, 2008, 12:48:30 PM »

Quote from: pw_Tony on May 23, 2008, 12:33:23 PM

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-

« **Reply #23 on:** May 23, 2008, 12:55:07 PM »

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.

« **Reply #24 on:** May 23, 2008, 01:10:27 PM »

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.

Blue

pw_Tony

hotrod56cars

pw_Tony

hotrod56cars

stc315

stc315

pw_Tony

429heads

hotrod56cars

2savage4you

Blue

ryanbrindle

FORKEDUP

SLCKREG

stc315

countryboyaustin

AQUAHOLIC

OC2Vegas

AQUAHOLIC

beerjet

pw_Tony

beerjet

crewchief22

GlassCutter