boring 305 to 383
Thread Starter
Junior Member
Joined: Dec 2008
Posts: 69
Likes: 0
From: Surprise Arizona
Car: primered 1987 IROC-Z/28
Engine: 305 TPI HO
Transmission: T5
Axle/Gears: Lotsa slip 3.23
boring 305 to 383
As the title says I want to bore my 305 out to make a 383 stroker. My question is how much does it need to be bored out. Sorry I suck at math and I did a search with no luck.
Senior Member
iTrader: (3)
Joined: Mar 2006
Posts: 690
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From: NY
Car: 86 Iroc
Engine: 383
Transmission: TH350
Axle/Gears: 3:73s!
Re: boring 305 to 383
you cant. You have to use a 350 block. And its not the bore that makes a big difference in a 383, its the stroke, you change the stroke from a 3.48 to a 3.75.
Thread Starter
Junior Member
Joined: Dec 2008
Posts: 69
Likes: 0
From: Surprise Arizona
Car: primered 1987 IROC-Z/28
Engine: 305 TPI HO
Transmission: T5
Axle/Gears: Lotsa slip 3.23
Re: boring 305 to 383
so is it possible to make a 383 stroker out of a 305? or should i start looking for a 350 block?
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Thread Starter
Junior Member
Joined: Dec 2008
Posts: 69
Likes: 0
From: Surprise Arizona
Car: primered 1987 IROC-Z/28
Engine: 305 TPI HO
Transmission: T5
Axle/Gears: Lotsa slip 3.23
Re: boring 305 to 383
thanks everybody. I had someone giving me wrong info. I am just going to look for a 350 block and build up from there. There seems to be plenty on Craigslist.
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