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#1 |
Senior Member
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Location: Lewisville, Nc
Posts: 10,234
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307vs 305
okay i recenty sored a 305 engine i am going to start cleaning up and install in my truck till i start engine class next semeter and rebuild the 307 but my question is would the toqure on the bolts (internal, head bolts ect..) be the same on the 305 as the 307? reason i'm asking i got a book with all the spec.s for the 307
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#2 |
Senior Member
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Location: Estherville, Iowa
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Re: 307vs 305
Yep - They are the same.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#3 |
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Location: Pittsburgh, PA
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Re: 307vs 305
The same? I am pretty sure they are not...Close to the same displacement, yes but NOT the same...
The 307 is basically a 283 block with a 327 crank (3.875" Bore X 3.25" Stroke) The 305 has a 3.74" Bore and 3.48" Stroke (the same as a 350)
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Project Family Values Build Thread Vehicles/Projects: -1971 C10 SWB Fleetside! Gathering parts now, will begin frame-off resto soon... Pleasure in the job puts perfection in the work. -Aristotle |
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#4 |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: 307vs 305
They are different displacements (bore/stroke), but i think the ? was on bolt tork up......yup they are the same!.....
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#5 |
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Location: Pittsburgh, PA
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Re: 307vs 305
Dirka... Guess it would help if I put the Bud Light can down and read the orig. post huh...
lmao...
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Project Family Values Build Thread Vehicles/Projects: -1971 C10 SWB Fleetside! Gathering parts now, will begin frame-off resto soon... Pleasure in the job puts perfection in the work. -Aristotle |
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#6 |
Senior Member
Join Date: Nov 2005
Location: Portland Oregon
Posts: 287
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Re: 307vs 305
If you bore the cylinder walls 1/8th of an inch on the 307 you will basically have a stock 327 small journal of coarse but still a respectable motor. I did one in my 57 chevy Bigwindow short step. Great running motor.
JRB |
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#7 |
Registered User
Join Date: Oct 2005
Location: dayton, oh
Posts: 327
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Re: 307vs 305
I'm pretty sure all "gen 1" small blocks share the same torque specs...
JRB, can the 307 safely handle a .125 overbore??
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#8 |
Account Suspended
Join Date: Oct 2004
Posts: 1,276
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Re: 307vs 305
So , which is the better short block 307 with the 327 crank or the 305 with the 350 crank. More torque on the 305 I am suspecting?? And can you safely bore the 307 .125 over???? 327s are cool motors!
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#9 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
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Re: 307vs 305
Quote:
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#10 | |
Senior Member
Join Date: Nov 2005
Location: Portland Oregon
Posts: 287
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Re: 307vs 305
Quote:
JRB |
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#11 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: 307vs 305
this is just my opinion here...byt that's a lot to spend to end up with such a small motor. You need torque, which is a natural byproduct of increased CID. And personally, if I wanted to make a 327, wouldn't it make more sence to grab a 350, check the boor on it and then slap in the 307 crank? Machining would be a bit cheaper... and at $1200 for machining... you could EASILY score a good 350 core to do this, no matter how hard they are to locate in your area.
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#12 | |
Senior Member
Join Date: Nov 2005
Location: Portland Oregon
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Re: 307vs 305
Quote:
JRB |
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#13 |
Registered User
Join Date: Sep 2006
Location: cedar rapids, iowa
Posts: 58
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Re: 307vs 305
Sorry for the corrections, BUT the 307 is a large journal engine, yes the 305 and 350 share the same stroke(3.484), to make a 327 you put the 307 crank into a 302/327/350 block, I personaly would'nt bore an engine out to a stoke bore. The machine work would cost more than a core/rebuilder. A 327 is a great high RPM street engine, where the 350 has a little more torque. Either engine can be built to suit your driving. Back to the first question, yes torque values vary a little from engine to engine and year to year, but not enough that you can't use your 307 specs. Hope this helps.
Aaron |
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#14 |
Senior Member
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Location: Lewisville, Nc
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Re: 307vs 305
the 305 is only going in long enough for me to finsh building my other motors 3 months at tops then the 307 is going back into the truck
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#15 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: 307vs 305
Quote:
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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