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- The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=4)

- - Horse Power (https://67-72chevytrucks.com/vboard/showthread.php?t=743863)

Harley03joe

08-03-2017 07:56 PM

Horse Power

What Is The H-P Of A 1987 Silverado Automatic Trans With A/C
5.7 EFI Engine

Thank You For The Answer
Harley03joe

Bobby Pootz

08-03-2017 08:02 PM

Re: Horse Power

Quote:

Originally Posted by Harley03joe (Post 8006900)

What Is The H-P Of A 1987 Silverado Automatic Trans With A/C
5.7 EFI Engine

Thank You For The Answer
Harley03joe

I got 185 from the GM archives

Harley03joe

08-03-2017 08:35 PM

Re: Horse Power

Quote:

Originally Posted by Bobby Pootz (Post 8006905)

I got 185 from the GM archives

Wow That Is Low
I Was Thinking More Like 300 H-P ??
Thank You
Harley03joe :smoke: :smoke: :smoke:

Bobby Pootz

08-03-2017 10:00 PM

Re: Horse Power

Quote:

Originally Posted by Harley03joe (Post 8006936)

Wow That Is Low
I Was Thinking More Like 300 H-P ??
Thank You
Harley03joe :smoke: :smoke: :smoke:

I get it, you WERE smoking!!!

Keith Seymore

08-03-2017 10:15 PM

Re: Horse Power

1 Attachment(s)

Quote:

Originally Posted by Bobby Pootz (Post 8006905)

I got 185 from the GM archives

For a 3/4 ton it would be 185; for a 1/2 ton it would be 210 Hp.

https://www.gmheritagecenter.com/doc...olet-Truck.pdf

Don't forget that is SAE "net" horsepower, so it's through the air cleaner and full exhaust and with the engine accessory drive installed (power steering, alternator, air conditioning).

The old numbers from the 1960's were "gross" horsepower, so that was with no air cleaner, open exhaust and no power robbing accessories.

K

Keith Seymore

08-03-2017 10:23 PM

Re: Horse Power

1 Attachment(s)

This is from the 1988 GMT400 info packet, but it is the same engine RPO L05.

I'm including it here because it shows the actual horsepower/torque curves.

https://www.gmheritagecenter.com/doc...olet-Truck.pdf

Incidentally - that's why we introduced the fuel injected TBI engines in the 1987 model year; to get a year early exposure before we came out with the GMT400 pickups for the 1988 model year.

Truck management thought it was a bit to much to do an all new truck architecture and an all new engine all at the same time.

K

Mattchu60

08-04-2017 10:21 AM

Re: Horse Power

I am very happy they decided to do the engine release a year early - fuel injection in the 87' trucks along with what is, in my opinion, the best looking styling of the 73-87 run (not everyone will agree here!) makes the 87' the ultimate squarebody. Obviously that doesn't make them a fire-breathing hp demon still, but the driveability is very nice.

Katrina/10

08-05-2017 07:57 AM

Re: Horse Power

TBI is a great system, thanks for the info.

Harley03joe

12-03-2017 06:19 PM

Re: Horse Power

Quote:

Originally Posted by Keith Seymore (Post 8007040)

Keith That Was A Lot Of Good Info Thank You For It
Harley03joe :smoke: :smoke: :smoke:

LT7A	12-04-2017 10:51 AM

Re: Horse Power

Very interesting. Thanks to all contributors. And Keith, to you especially with the archive materials. That's so cool to have access to that via you.

Malo83

12-04-2017 03:28 PM

Re: Horse Power

My tired old 305 is probably just at 75 hp :lol:

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