Almost ready to pull the trigger...

[kablooie]

I looked at three Blazers today and the one I liked the most was a 1981. The Vin decodes as a 305 block but the owner says it is a 350. What can I do to verify what is under the hood.

Secondly, the test drive was decent for a truck that has been sitting for at least several months. However, when I floored it the truck seemed to hesitate a bit, which leads me to believe it will definitely need a tune up, but I don't think this is an indication of 305 versus 350... What do you think?

Thanks,
Louie

 

[broncoman6524]

find the nubmers on hte back of the block behind the drivers valvecover....these will tell you the year,what it came out of, number of bolts on the main.

PICS!?1

 

[tumbleweed1002]

A little easier look on the front passangers side of the block just under the head is the casting number of 350s no number no 350!

 

[kablooie]

it's on Ebay, but the description is wrong.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=003&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=130128931683&rd=1&rd=1

 

[kablooie]

Isn't the block the same on a 350 versus a 305? I thought the differences were the heads and crank (shorter stroke, meaning higher RPMs). Was I absent for this subject in Auto Shop?? lol.

 

[tumbleweed1002]

I'v never had a boat anchor uh I mean a 305 but according to gm and my own 350 thats where they put the casting numbers on 350s.

 

[pauly383]

Sounds to me like a motor that at least needs tuned , and have someone besides the previous owner touch the carb

 

[pauly383]

Isn't the block the same on a 350 versus a 305? I thought the differences were the heads and crank (shorter stroke, meaning higher RPMs). Was I absent for this subject in Auto Shop?? lol.

Same crank , smaller bores , its still oversquare ( large bore than stroke ) and would of revved if they would of included a better set of heads , ehaust , and intake

in newer blocks ( 68-85 ) of importance to us 302/327/350 is same block