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  #1  
Old 01-10-2012, 11:15 AM
jamesandrewjohnson jamesandrewjohnson is offline
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Default 460 Ford Horsepower and Torque Ratings

Alright, I've been wondering for a long time what the factory 429s/460s put out, because I've heard everything from 100-500 hp, and I would really like to see an actual factory rating. Maybe an old brochure, something out of a reliable book, etc. I just need solid, reliable facts on the factory ratings.
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  #2  
Old 01-10-2012, 01:40 PM
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I've got some old factory manuals that state 210hp on the mid 70's engines. Used to have brocures for a 68 Lincoln (when I owned one) that showed 365hp.

Those are pretty much the splits for the vast majority of factory engines pre and post smog. CJ, SCJ and Boss were of course different.
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Old 01-11-2012, 01:53 AM
MCrowson MCrowson is offline
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i had a 96 F250 w/460 and the rating on it was 235hp and like 380lb tq. The BOSS stangs were 370hp i think but i bet they made a bit more
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Old 01-11-2012, 10:46 AM
Brad Johnson Brad Johnson is offline
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A big chunk of the discrepancy happened when they went from straight flywheel HP ratings to SAE net in the early 70s. That, plus the smoggification of engines from the same era made HP ratings plunge in the span of a single year.

Brad
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Old 01-11-2012, 03:28 PM
Redhawk Redhawk is offline
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I often wondered if factory ratings were crankshaft, or rear wheel HP#'s. Does anyone know for sure?
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Old 01-11-2012, 04:19 PM
429TORQ 429TORQ is offline
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Quote:
Originally Posted by Redhawk View Post
I often wondered if factory ratings were crankshaft, or rear wheel HP#'s. Does anyone know for sure?
SAE Net(72'-up) is supposed to be measured at the back of the transmission with all accessories installed and running. Gross(71'-prior) is more like a typical dyno run. right at the back of the crankshaft.

Last edited by 429TORQ; 01-11-2012 at 04:22 PM. Reason: got my nets and grosses mixed up...
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Old 01-12-2012, 06:03 AM
stonecoldtx stonecoldtx is offline
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Quote:
Originally Posted by 429TORQ View Post
SAE Net(72'-up) is supposed to be measured at the back of the transmission with all accessories installed and running. Gross(71'-prior) is more like a typical dyno run. right at the back of the crankshaft.
Actually, Net HP is measured at the crankshaft, just like gross HP.

Here is a good definition of the differences:

http://en.wikipedia.org/wiki/Horsepower#SAE_gross_power
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Old 01-12-2012, 11:18 AM
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Quote:
Originally Posted by stonecoldtx View Post
Actually, Net HP is measured at the crankshaft, just like gross HP.

Here is a good definition of the differences:

http://en.wikipedia.org/wiki/Horsepower#SAE_gross_power
It specifically states as a footnote in the 72 and up HP ratings in chilton and motor's manuals that the ford HP specs are "as measured at the end of the trans with all accessories installed".

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Old 01-12-2012, 01:16 PM
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Quote:
Originally Posted by The Mad Porter View Post
It specifically states as a footnote in the 72 and up HP ratings in chilton and motor's manuals that the ford HP specs are "as measured at the end of the trans with all accessories installed".

correct till sep 71 all were at flywheel, then from sep71 it was taken from tailshaft,all acc installed,and RUNNING
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  #10  
Old 01-12-2012, 02:23 PM
TorinoStyle2 TorinoStyle2 is offline
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68-71 429 4V=360HP
69-70 429 Boss=375HP
70-71 429 CJ=370HP
70-71 429 SCJ=375HP
68-71 460 4V=365HP
1972 460 4V=245HP
73-78 460 4V=212HP
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Old 01-12-2012, 06:11 PM
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I ahve a factory ford manual for 78 trucks i dont remember exactly the ratings but some big blocks im thinking the 400 was like 180hp, pitful compared to todays standards I just wonder what a completly new designed big block 460ish cid engine with todays technology could produce in hp and torque. The new coyote ford engine has some awsome hp per ccubic inch ratio
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Old 01-12-2012, 07:51 PM
MauriSSSio MauriSSSio is offline
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Quote:
Originally Posted by 76ford466 View Post
I ahve a factory ford manual for 78 trucks i dont remember exactly the ratings but some big blocks im thinking the 400 was like 180hp, pitful compared to todays standards I just wonder what a completly new designed big block 460ish cid engine with todays technology could produce in hp and torque. The new coyote ford engine has some awsome hp per ccubic inch ratio
the new 5.0 is a beast. with just boltons those things are making in the area of 450+HP at the wheels! (RWHP). cammed 5.0's are near the 500rwhp mark. very impressive, and they make excellent torque as well. If i had a chance to do it all over again id probably opt for a new 5.0 over my 532 stroker!
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Old 01-13-2012, 12:29 PM
Brad Johnson Brad Johnson is offline
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Quote:
Originally Posted by MauriSSSio View Post
the new 5.0 is a beast. with just boltons those things are making in the area of 450+HP at the wheels! (RWHP). cammed 5.0's are near the 500rwhp mark. very impressive, and they make excellent torque as well. If i had a chance to do it all over again id probably opt for a new 5.0 over my 532 stroker!
They make tons of HP but you have to spin them pretty tight to get it. The idle-to-3500 torque curves aren't much to write home about, though. A stroker, even a wimpy one, will smoke the 5.0 in terms of off-idle grunt.

As with everything hot rod, all depends on what's best suited to your application.

Brad
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Old 01-13-2012, 08:02 PM
MauriSSSio MauriSSSio is offline
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Quote:
Originally Posted by Brad Johnson View Post
They make tons of HP but you have to spin them pretty tight to get it. The idle-to-3500 torque curves aren't much to write home about, though. A stroker, even a wimpy one, will smoke the 5.0 in terms of off-idle grunt.

As with everything hot rod, all depends on what's best suited to your application.

Brad
they have excellent street manners. They might not have the same tq as our big blocks but still manage to put over 350rwtq at 3500rpm which isnt bad at all and you dont even have to spin them that high to get that power. Also, gearing is your friend, let it multiply that tq if you want more!! Its truly a superior engine for a street/strip car. I still like the BBF strictly for racing though, but times have definately changed!
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Old 01-13-2012, 08:59 PM
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All I know is with some attention they pull hard... HP is nice and numbers can look good on paper but yank'n a crew cab dually around like a rag doll is enough for me...
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