horspower and torque
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Junior User
Joined: Aug 2010
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From: Western mass
horspower and torque
hey guys, i was wondering ow much power my motor has, its an 87 carberueted 302 with no cat, or smog pump or o2 sensor and a magnaflow muffler, the websites i have looked at says it only has 145 horses and i kno that cant be right. any ideas?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
There are a couple ways to find out, put it on a dyno or run it down the 1/4 mile. Your motor is mechanically much the same as the later EFI motors so it has similar potential.. which is somewhere around 180-200hp.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Well he's not totally wrong, any 5.0 can produce upwards of 250-275hp but it takes a complete exhaust system, a bigger cam, and a little better intake for the carbed versions to get there. But as delivered these motors were smothered down into the 150-200hp range with painfully restrictive exhaust systems and tiny camshafts.
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Junior User
Joined: Aug 2010
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From: Western mass
as i said it had the magnaflow full exhuast, but the manifold is still one there, im assuming some headers will take care of that?
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Post Fiend
Joined: Nov 2008
Posts: 23,849
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From: McKenzie River
My book says 185hp and 270ft lbs torque for the 302 in F-series in 87.
Does not sound to shabby compared to the Chev. 350 in my 83 Motorhome, with 160hp and 265ft lbs torque.........and it has to haul 12,000lbs around.
Does not sound to shabby compared to the Chev. 350 in my 83 Motorhome, with 160hp and 265ft lbs torque.........and it has to haul 12,000lbs around.
Postmaster
Joined: Mar 2008
Posts: 2,703
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From: Des Moines, Iowa
185 HP and 270 lb/ft torque is for the efi model in 1987... I would think it depends on your carb. If you have a 4bbl carb your probably at 185-190HP. If you have a 2 bbl carb you can cut that back 30 HP easily... You can probably expect 5-15HP from a complete new exhaust (headers to tail pipe) in 3in.
Keep in mind the 1980-1985 302 only made 133HP and 233 ft/lbs torque with a 2 bbl carb... I don't know what year the engine you have is... Or what other changes besides a 2-4 bbl carb change was made from the 86-87 lines... but those changes might have effect too... especially if they changed cams...
Keep in mind the 1980-1985 302 only made 133HP and 233 ft/lbs torque with a 2 bbl carb... I don't know what year the engine you have is... Or what other changes besides a 2-4 bbl carb change was made from the 86-87 lines... but those changes might have effect too... especially if they changed cams...
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Junior User
Joined: Aug 2010
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From: Western mass
ya its the manifold into 3 inch pipes to the muffler, then a really big pipe, prob doest matter though, and as i said there is no catalytic converter or smog pump or anything on here, and ive read that robs the performance of motors, and its only a 2bbl, till chirstmas time atleast 
Hotshot
Joined: Sep 2001
Posts: 11,958
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Could you be a bit more clear on what size pipe is where on your exhaust? If its too big it won't help your motor any.
Are you saying that the 2 pipes off of each manifold are 3 inch? If so thats way too big and will actually hurt performance on your engine. If the single portion of the exhaust is bigger than 3 inch that will hurt as well.
Are you saying that the 2 pipes off of each manifold are 3 inch? If so thats way too big and will actually hurt performance on your engine. If the single portion of the exhaust is bigger than 3 inch that will hurt as well.