Anybody ever stroked their 327?
02-21-2005, 11:09 AM
#1
Anybody ever stroked their 327?
327 small journal stroker kits are available. A 3.75 stroke and a .030 overbore (like my block needs) will yield about 383 cubes. Can anybody here speak about this from experience? What mods will the block need?
Chuck
Chuck
02-21-2005, 12:16 PM
#2
Team Owner
i wouldn't think it would be to much different than a 350 stroked out to 383... with the smaller dia. i would get a forged crank.. it sould have a little less frictional loss
02-21-2005, 03:12 PM
#4
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IIRC the 327 was a 4" bore block.
Same as a 350 block.
The cranks came in a couple of flavors.
Large journal and small journal...IIRC.
If you have the large journal 327 a stroker crank will fit right in there.
May have to grind just a little for clearance just like any other 350 block.
It's been a longggg time since I built a 327 so hope I 'recalled' correctly.
Same as a 350 block.
The cranks came in a couple of flavors.
Large journal and small journal...IIRC.
If you have the large journal 327 a stroker crank will fit right in there.
May have to grind just a little for clearance just like any other 350 block.
It's been a longggg time since I built a 327 so hope I 'recalled' correctly.
02-21-2005, 04:28 PM
#5
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The only OE large journal 327s were built in MY '68 - basically just a 350 (large journal) block with the 3.25" stroke crank.
I would be a little leary of a small journal 3.75" stroke crank. You loose a lot of journal overlap. The reason the journal sizes were increased on 350s was to restore journal overlap, not because of bearing loading issues. Same with the increase in main journal diameter on 400s.
Duke
I would be a little leary of a small journal 3.75" stroke crank. You loose a lot of journal overlap. The reason the journal sizes were increased on 350s was to restore journal overlap, not because of bearing loading issues. Same with the increase in main journal diameter on 400s.
Duke
02-21-2005, 11:42 PM
#6
Duke can you throw in a few numbers here.
Duke can you throw in a few numbers here. The crank is what would be correct for a 1966 SBC small journal 327cid block number GM#3858174. (I don't have the crank handy to check the part number on it)
What is the main and rod journal diameter? How much do they overlap? The stroke is 3.25in right? How much larger is the large journal SBC crank? Which journal is larger?
Chuck
What is the main and rod journal diameter? How much do they overlap? The stroke is 3.25in right? How much larger is the large journal SBC crank? Which journal is larger?
Chuck
02-22-2005, 12:44 AM
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Small journal cranks are 2.30"/2.00". Large journal cranks are 2.45"/2.10", and the mains were increased to 2.65" on the 400.
Journal overlap is important to both crankshaft strength and torsional and bending stiffness.
From the journal diameters and crank throw radius, (which is half the stroke) it's simple arithmetic to compute journal overlap.
Duke
Journal overlap is important to both crankshaft strength and torsional and bending stiffness.
From the journal diameters and crank throw radius, (which is half the stroke) it's simple arithmetic to compute journal overlap.
Duke
