How much Horsepower???
#1
How much Horsepower???
Hey guys im new to the site and im sure this is a question that you guys probably get alot.........i was just wondering with these specs that i have, how much horsepower would u think i have?
455 .30 over
holley 750 dbl pumper
roller rocker arms
edelbrock intake
flowmasters
headers
big radiator
455 .30 over
holley 750 dbl pumper
roller rocker arms
edelbrock intake
flowmasters
headers
big radiator
#4
There is really no way to tell, not knowing all the specs, and the owners tuning abilities.
It still will add up to a meaningless number.
The only way to gauge output, is to line them up at a dragstrip.
ET can convert to horsepower at THE WHEELS only.
Tons of 14 second jockey's say "it has 500 hp", which it does not. If he tuned it up, changed the jets, advanced the timing, and blocked the heat risers, he may find 50 more.
It takes 350 HP at the wheels to run 12 flat (which is around 425 at the crankshaft-much is soaked up by the transmission).
A 13 second car will scare most people.
JMO
Jim
It still will add up to a meaningless number.
The only way to gauge output, is to line them up at a dragstrip.
ET can convert to horsepower at THE WHEELS only.
Tons of 14 second jockey's say "it has 500 hp", which it does not. If he tuned it up, changed the jets, advanced the timing, and blocked the heat risers, he may find 50 more.
It takes 350 HP at the wheels to run 12 flat (which is around 425 at the crankshaft-much is soaked up by the transmission).
A 13 second car will scare most people.
JMO
Jim
#6
Iceman,
What year 455? The cam and heads on every 455 do not have the same specs. Knowing the year will give responders a better chance (of course this assumes the motor is all original with no non-orginal parts installed inside the motor). You will also have to know these facts in order to get an accurate assesment of HP.
What year 455? The cam and heads on every 455 do not have the same specs. Knowing the year will give responders a better chance (of course this assumes the motor is all original with no non-orginal parts installed inside the motor). You will also have to know these facts in order to get an accurate assesment of HP.
#7
A "stroker" cam? What is that?
#11
do you have a build thread on your engine ? Have some questions, not to
hijack this thread.
To OP if you look up stock specs on your year/model add 20 HP for exhaust you'd be close. My guess ?
#15
#16
i think my 455 is a 1975 and according to the shop im at least a 10:1 compression ratio????
forgot to mention i have a chevy 12 bolt with a 3:73 posi and a turbo 400 with shift kit.
Everything inside the engine are all new parts, the only difference i really see in the build sheet above is in the "block parts" section where his bearings and pistons are all high performance im not sure if my parts are or if there just stock
forgot to mention i have a chevy 12 bolt with a 3:73 posi and a turbo 400 with shift kit.
Everything inside the engine are all new parts, the only difference i really see in the build sheet above is in the "block parts" section where his bearings and pistons are all high performance im not sure if my parts are or if there just stock
#17
i really like the sound of this guys olds and his is fast, is the sound from the cam he has?
http://www.youtube.com/watch?v=mfC0i...eature=related
http://www.youtube.com/watch?v=mfC0i...eature=related
#18
i really like the sound of this guys olds and his is fast, is the sound from the cam he has?
http://www.youtube.com/watch?v=mfC0i...eature=related
http://www.youtube.com/watch?v=mfC0i...eature=related
http://www.realoldspower.com/phpBB2/...ic.php?t=12112
#21
#23
i think my 455 is a 1975 and according to the shop im at least a 10:1 compression ratio????
forgot to mention i have a chevy 12 bolt with a 3:73 posi and a turbo 400 with shift kit.
Everything inside the engine are all new parts, the only difference i really see in the build sheet above is in the "block parts" section where his bearings and pistons are all high performance im not sure if my parts are or if there just stock
forgot to mention i have a chevy 12 bolt with a 3:73 posi and a turbo 400 with shift kit.
Everything inside the engine are all new parts, the only difference i really see in the build sheet above is in the "block parts" section where his bearings and pistons are all high performance im not sure if my parts are or if there just stock
He ran 13.60's with a stock smog mid 70's 455 in a 65 Cutlass, 3.08 gear.
It's inspirational.
Spend your money which ever way you deem appropriate.
I estimate 250 hp at this point.
Jim
Last edited by Warhead; August 19th, 2010 at 07:20 AM.
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