[TMW]

ok i just got a 1981 c10 that was a 250 sixer. the guy put a 350. but i want to know what 350 i have. on the back dr side of the block it has gm5.7lg below that it has sgi the date code is g319. but i thought all these motors where tbi and had electric fuel pumps...well mine has a mechanical one on the block. any idea what this really is. it has center bolt valve covers. oh and it has a edelbrock performer eps intake manifold and q-jet carb. it has a popped head gasket and while i am fixing that i want to put some performance parts on it. so before i order the wrong stuff i would really like to know what i have. new to chevys...i am a ford man... so i need help otherwise i will just sell it and go back to a ford.

in this pic you can see the center bolts and the fuel pump

 

[TMW]

it has a popped head gasket and while i am fixing that i want to put some performance parts on it. so before i order the wrong stuff i would really like to know what i have. new to chevys...i am a ford man... so i need help otherwise i will just sell it and go back to a ford.

 

[Hogg]

A brand new 4 bolt Vortec 350 is $2000 from GM.

If your 350 came from a Vette/Camaro/Firebird/Caprice(B-Body) it will have a roller cam.
If it is from a 1987-1995 truck it should have a flat tappet hydraulic cam.

It is 100% an 87-95 engine. Many of them were TBI/TPI but still had the mechanical fuel pump capability. I had a 1989 TPI 305 that originally had a manual trans(making it a desireable type of roller cam-comparatively speaking). I installed this TPI/305 in a 1984 GMC Sierra that also came stock with the LE3 250 inline 6 with the stock 2 bbl carb which made [email protected]/210lb/ft [email protected]

I'm guessing its probably an LO5 350, but who knows.

peace
Hog

 

[TMW]

can i put older heads on it like pre 86? i want to build it and increase the hp quite a bit. my goal is somewhere between 450-600 hp. making it like a pro street style truck.

 

[Hogg]

Yup, they are GEN 1 from 1955-1995.

You will need some serious haads to come anywhere nears your goals, plus some boost as well.

peace
Hog

 

[TMW]

yeah planning on a 144 cid s/c and somewhere around a 125 shot of giggle gas. and so i understand this right i can put non- center bolt heads on my 1989 center bolt head 350. so the short blocks from 55 until 95 are the same?

 

[Hogg]

yeah planning on a 144 cid s/c and somewhere around a 125 shot of giggle gas. and so i understand this right i can put non- center bolt heads on my 1989 center bolt head 350. so the short blocks from 55 until 95 are the same?

I suggest you get a SBC book. There are differnces if you go back to 55, heck they didnt even have oil filters in the 1st year of the SBC. The basic design is the same.
You wouldnt want anything from about pre 62 anyways.

It would be easier to get your goals going to a newer engine IMO.

peace
Hog

 

[TMW]

ok understood,thank you