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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 81project on October 07, 2008, 07:40:47 pm

Title: '81 305 stock carb
Post by: 81project on October 07, 2008, 07:40:47 pm

I can't find an answer to my question anywhere. Is the stock 4bbl carb on a 1981 305 square or spread bore?

Title: Re: '81 305 stock carb
Post by: VileZambonie on October 07, 2008, 08:11:37 pm

Quadrajets are spread bore.

Holley's are square bore.

You should have a Q-Jet

Title: Re: '81 305 stock carb
Post by: TexasRed on October 07, 2008, 08:15:51 pm

Not all holleys are squarebore. In fact, they made a ton of spreadbores.

The factory carb should be a spreadbore qjet from 1981 but it may have been changed before you got it.

Title: Re: '81 305 stock carb
Post by: 81project on October 07, 2008, 08:21:11 pm

Thanks guys. I assume it is a spread bore then. It is a Rochester Qjet.

Title: Re: '81 305 stock carb
Post by: VileZambonie on October 07, 2008, 08:28:14 pm

Yes holley does make spread bores I 've got a few of them in stock but stock carb is a spread bore.