CUTLASS casting no. finally

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oldsmobile joe

Royal Smart Person
Nov 12, 2015
2,044
113
mpls
maybe the l is for liter and the g is for g-body.
 

MrSony

Geezer
Nov 15, 2014
6,494
113
Des Moines, Iowa
Not a lot of info on decoding 307s, I think it's an '86 Engine.
 

MrSony

Geezer
Nov 15, 2014
6,494
113
Des Moines, Iowa

MrSony

Geezer
Nov 15, 2014
6,494
113
Des Moines, Iowa
Oct 14, 2008
8,323
113
Melville,Saskatchewan
Nearly all the complaint's of gutless 307's were the later swirl port motors like your motor. They are reliable, low RPM torque motors, high RPM breather's they are not. Small swirl intake ports, basically a larger ci Olds 260 with a 4 bbl feedback carb and roller cam.
 

oldolds

Greasemonkey
Thread starter
May 17, 2017
239
28
pine city/rosaila washington
so the 86 307 is not a high speed motor but it has good torque on the bottom end just not a lot of hp? so should i stick with it for daily driving or get a 350 out of a 70's and rebuild it ?
 
Oct 14, 2008
8,323
113
Melville,Saskatchewan
The pre 77 Olds 350's or the 77 to 79 403 are much easier to get power out of. Only keep the 307 if maximum mpg is your goal.
 
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