350 to 383
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In the Staging Lanes
Joined: May 2010
Posts: 38
my friend corrected me, kind of embarassing. its a 3 speed automatic on my car. the rebuild kit does not specify how much horsepower, but it says it has all the parts to make it a street/strip tranny from them.
Newbie
Joined: May 2007
Posts: 9
If I'm not mistaken, to get a 383, you need a 0.060" bore. The stock bore for a 350 yields a 377 when using the 3.75" stroke crank. 350's use a 3.48" stroke. Chevy 302 (not the 305) 327 & 350 all use the 4" bore.
The other posters are correct about th balancing. Summit & Jegs sell kits that have an internally balanced 3.75" stroke crank for about what it costs to put a 400 crank in one.
DISP BLOCK BORE CRANK STROKE
302 4.000 3.00
305 3.736 3.48
327 4.000 3.25
350 4.000 3.48
377 4.000 3.75
383 4.060 3.75
400 4.125 3.75
The other posters are correct about th balancing. Summit & Jegs sell kits that have an internally balanced 3.75" stroke crank for about what it costs to put a 400 crank in one.
DISP BLOCK BORE CRANK STROKE
302 4.000 3.00
305 3.736 3.48
327 4.000 3.25
350 4.000 3.48
377 4.000 3.75
383 4.060 3.75
400 4.125 3.75
Overdrive Member
Joined: Nov 2009
Posts: 4,848
From: off the grid
If I'm not mistaken, to get a 383, you need a 0.060" bore. The stock bore for a 350 yields a 377 when using the 3.75" stroke crank. 350's use a 3.48" stroke. Chevy 302 (not the 305) 327 & 350 all use the 4" bore.
The other posters are correct about th balancing. Summit & Jegs sell kits that have an internally balanced 3.75" stroke crank for about what it costs to put a 400 crank in one.
DISP BLOCK BORE CRANK STROKE
302 4.000 3.00
305 3.736 3.48
327 4.000 3.25
350 4.000 3.48
377 4.000 3.75
383 4.060 3.75
400 4.125 3.75
The other posters are correct about th balancing. Summit & Jegs sell kits that have an internally balanced 3.75" stroke crank for about what it costs to put a 400 crank in one.
DISP BLOCK BORE CRANK STROKE
302 4.000 3.00
305 3.736 3.48
327 4.000 3.25
350 4.000 3.48
377 4.000 3.75
383 4.060 3.75
400 4.125 3.75
377 is 4.125x3.48
383 is 4.030x3.75 or 4.000x3.800 (GM Performance Parts ZZ383)
As for the others I won't speak on them cause I'm not POSITIVE. Exept the 400.
1st Gear Member
Joined: Apr 2010
Posts: 127
From: quebec , canada
if you bore your block out 030 it can still be bored more after .
a block at 060 over tends to get chucked out when it;s time to rebuild again.
some guys wont even buy a motor 060 over even if it;s running
a block at 060 over tends to get chucked out when it;s time to rebuild again.
some guys wont even buy a motor 060 over even if it;s running
