HUMAN DYNO wanted!!!
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HUMAN DYNO wanted!!!
hey guys i have 360 in my 68 f100 custom cab and i was wondering how much hp you think it would put to the rear wheels. it has the standard chrome 14 in. iar filter w/ a 600cfm Edelbrock, a RV gring cam, a high volume oil pump, hedman hedders(shorties) with dual glass pack mufflers w/ 2 1/4 in. pipe exiting angled behind the rear wheels and the whole engine was only bored .020 over so id displaces a little over 364 in of ford muscle.
Just Wonderin'
THanks
Just Wonderin'
THanks
Elder User
Joined: Aug 2001
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From: Collierville, TN
HUMAN DYNO wanted!!!
Hard to tell without a lot more info (compression ratio, cam specs, etc.) but I'd guess you're making 250-280 gross hp at the flywheel. Depending on what accessories you're running and what transmission you have (manual or auto), power at the rear wheels is probably in the 175-225 range.
To know for sure, you need a chassis dyno. You can get pretty close, though, by weighing your truck and then getting some time and distance acceleration measurements.
To know for sure, you need a chassis dyno. You can get pretty close, though, by weighing your truck and then getting some time and distance acceleration measurements.
Post Fiend
Joined: Sep 2000
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From: Oregon
HUMAN DYNO wanted!!!
I assume you are running stock heads since you didn't mention otherwise. Guessing from generic RV cam specs I'd guess you are making just a bit over 200 at your rear wheels. This may not seem like a lot but remember that your FE is also cranking out a hell of alot of torque and most people who brag about their HP are talking about horse at the flywheel.
Post Fiend
Joined: Feb 2001
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From: Missouri
HUMAN DYNO wanted!!!
I think you did the best bolt on for your money and not getting foolish with the cam or carb but the stock 360 was rated at 170HP. I don't think you are going to get another 80 - 100 horses with a stock intake and heads along with compression in the low 8's. I'm guessing no more than 240 horse at the flywheel. An "S" code intake would probably wake things up a little more. You are definitely going to make more than a noticeable amount of power though.
Post Fiend
Joined: Sep 2000
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From: Oregon
HUMAN DYNO wanted!!!
[updated:LAST EDITED ON 13-Jun-02 AT 08:35 PM (EST)]Its probably my prejudice showing, but I always thought the FEs were underrated by the book. The "experts" say the 428 certainly was underrated on paper, and I just extend that to the FE class in general. Doesn't make me right, but I just don't see a big block making under 200 horse at the rubber when its topped with a four barrel, a cam and breathing through headers. I'm generalizing I know, since there are allot of other factors, but...
Elder User
Joined: Aug 2001
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From: Collierville, TN
HUMAN DYNO wanted!!!
Seth, keep in mind that the 360 and 428 are entirely different animals. The 360 is a "big block" only in the sense that it has a deep block skirt and can be set up for big cubes. Still, its displacement is typical of small blocks. Just as important is the compression ratio. The 428 was a roughly 10:1 or greater CR motor, whereas the 360 was generally 8.4:1. Then consider the horribly designed exhaust manifolds (some of the worst ever, IMNSHO), and a HP rating of well below 200 is not surprising for a stock motor.
I think you could get some serious power out of a 360, but no one bothers because it would be far cheaper (and lighter) to build a small block of about the same displacement. If you want to keep the big block, then the only sensible thing to do is to stroke it to 390 or 410 cid, which both adds the benefits of the longer stroke and greater displacement, AND increases the compression ratio.
I think you could get some serious power out of a 360, but no one bothers because it would be far cheaper (and lighter) to build a small block of about the same displacement. If you want to keep the big block, then the only sensible thing to do is to stroke it to 390 or 410 cid, which both adds the benefits of the longer stroke and greater displacement, AND increases the compression ratio.
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HUMAN DYNO wanted!!!
I did forget to mention that i put an alluminum WEIAND under the Edelbrock, about how much more would that give me ?
remocing the stock exhaust manifolds(10-15lbs a piece) and the stock manifold wieghs somewhere around 50-75lbs would that help any more(minus75-100lbs total)?
thanks for all your help guys
remocing the stock exhaust manifolds(10-15lbs a piece) and the stock manifold wieghs somewhere around 50-75lbs would that help any more(minus75-100lbs total)?
thanks for all your help guys
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Elder User
Joined: Aug 2001
Posts: 962
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From: Collierville, TN
HUMAN DYNO wanted!!!
Not really. While a 4v intake manifold will help you make a little more power than the stock 2v, at least at high rpms, we already factored it in. You had told us that you had an Ebock 600 cfm, so we pretty much guessed you had a 4v intake manifold.
As for replacing the stock cast iron intake and exhaust manifolds, that does save weight. Less weight doesn't do anything for power output, however, unless it is reciprocating/rotating weight (pistons, rods, crankshaft, etc.). Less weight will help your acceleration (and perception of power) because acceleration is all about power-to-weight ratio.
You already told us that you replaced the stock cast iron log manifolds with shorty headers. That is a modification that WILL improve power across the rpm range. The FE manifolds are awful. When I made my estimate, however, I was already accounting for the headers.
The bottom line is that you can't really make a lot of power from a 360 without tearing it completely down and starting from scratch, and if you're going to do that you might as well stroke it to 390 or 410 cubes while you're at it.
As for replacing the stock cast iron intake and exhaust manifolds, that does save weight. Less weight doesn't do anything for power output, however, unless it is reciprocating/rotating weight (pistons, rods, crankshaft, etc.). Less weight will help your acceleration (and perception of power) because acceleration is all about power-to-weight ratio.
You already told us that you replaced the stock cast iron log manifolds with shorty headers. That is a modification that WILL improve power across the rpm range. The FE manifolds are awful. When I made my estimate, however, I was already accounting for the headers.
The bottom line is that you can't really make a lot of power from a 360 without tearing it completely down and starting from scratch, and if you're going to do that you might as well stroke it to 390 or 410 cubes while you're at it.
Post Fiend
Joined: Sep 2000
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From: Oregon
HUMAN DYNO wanted!!!
I bet it is. You'll sure want to rip that off your engine! Single planes are great for their purpose, but they have no place on a mild 360 in a truck. Anyways, check and let us know.
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HUMAN DYNO wanted!!!
thats the one cost me about $250 and this is a buget truck (my first vehicle me and my dad put together) i hope it wasnt a waste of money
anyway this truck will have plenty of power for a 16 year old i think if not ill do it all over again 390 style or something anyway thnx for your input i have a hp niegborhood
anyway this truck will have plenty of power for a 16 year old i think if not ill do it all over again 390 style or something anyway thnx for your input i have a hp niegborhood
Post Fiend
Joined: Feb 2001
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From: Missouri
HUMAN DYNO wanted!!!
Single plane manifolds sacrafice low end power in return for top end. The weiand has small runners and probably won't produce as much HP on either the low end or the high end as the performer RPM.