'71 BB 402 help!

[gmc 2500 4x4]

i have a 71 402 i had redone and was looking for the book that covers the engine tuning specs, i looked high and low for vehicle specific and this chart is all i found close. motor is in my 69 gmc with original manual trans. with no emission stuff. i love these charts

[mr.mud1]

here's a few pictures out of my tune-up book,hopefully what you need is there,holler if you need anything else.Greg
well these weren't sideways and i'm not smart enough to know how to flip them around.grade 3 was the hardest 4 years of my life??i re-read your post and see it's 71 402 specs you need so i'll send them cause it'll be hard to read sideways?what a dork??

[mr.mud1]

the rest of the pics

[gmc 2500 4x4]

thanx greg, what book is this from?

[mr.mud1]

hi,it's an old "Prestolite" tune-up specs book i got a 100 years ago,1960-1977 on the cover.seems to me it was in a tune-up cabinet full of Prestolite parts that a salesman from one of the suppliers was selling when i worked at a service station a long time ago.somehow i hung onto this book and it's saved my bacon many times.it's full of good info.i remember the cover was bright yellow when i first got it.faded away now.take care.Greg

[Accelo]

Right out of the 1972 Service Manual;

Sometimes I get lucky and find additional information in GM Heritage Center Documents;

https://www.gmheritagecenter.com/gm-...brochures.html

This link may have what you were looking for.
I found it under Vehicle information kits on the GM site;
https://www.gmheritagecenter.com/doc...olet-Truck.pdf

Weird stuff in the documentation. Like a 1/2T truck has a 20gal fuel tank and 3/4T and up had a 21gal tank.
GM documentation also lists the exhaust as single aluminized. Which I find difficult to believe. Process must have gotten a lot better in later years.

[gmc 2500 4x4]

Originally Posted by Accelo

Right out of the 1972 Service Manual;

Sometimes I get lucky and find additional information in GM Heritage Center Documents;

https://www.gmheritagecenter.com/gm-...brochures.html

This link may have what you were looking for.
I found it under Vehicle information kits on the GM site;
https://www.gmheritagecenter.com/doc...olet-Truck.pdf

Weird stuff in the documentation. Like a 1/2T truck has a 20gal fuel tank and 3/4T and up had a 21gal tank.
GM documentation also lists the exhaust as single aluminized. Which I find difficult to believe. Process must have gotten a lot better in later years.

thanx!