notes about SBC 327 crankshaft, or if I had it to do over

Dragsinger · 05-05-2015, 04:56 PM

Racers, after spending time with the Super 10 engine research I decided to build a 300/327 engine combo. I think that decision is good and fits well with the Super -10 GT super stock class.

I decided on a Dart SHP Pro block, again, I think a good decision.

About the crankshaft, after considerable searching I found a suitable 327 factory shaft then sent it to Mile High for full work over. Again, very happy with the work and pricing from Mile High.

The problem, main bearings. A few years ago a special thick bearing was on the market that adapted a 327 main to a 350 main [the Dart block is of course 350 main] The thick bearing can no longer be found.

After more searching I did find spacer bearings but I did not like the fit. So, align hone the spacer bearings in the block to get the bore true.

It is assembled with those honed to fit spacers and all is OK.

Knowing what I know now, a new shaft with 350 mains and 327 small pins would have been a better choice and given more bearing selection options.

So, maybe my experience might help another race who is considering a 327 build.

Dwight Southerland · 05-05-2015, 05:08 PM

A large journal 327 crank is lighter than a small journal crank.

Bill Moulding · 05-05-2015, 06:07 PM

Well that is interesting Dwight. How much weight are we talking about?

ss3011 · 05-05-2015, 08:46 PM

Both Jegs and Summit , among others, sell Clevite MS1110H Thick bearings, There is also MS1110H-1 available. Hope that helps for the future.

Dragsinger · 05-05-2015, 11:40 PM

ss3011,

the spacer bearings are listed in a number of location on the web but when you call "those are no longer available" is the answer. Even though the web site says, "will ship from manufacture" Clevite no longer produces them nor King nor any other manufacture that I could find.

ss3011 · 05-06-2015, 02:51 AM

Just got off the phone with Summit, they verified they have 4 sets of those bearings in stock ready for shipment.

Dragsinger · 05-06-2015, 04:48 AM

I forgot to explain, the mains are .010" under , that is the problem with finding the thick bearings.

Dwight Southerland · 05-06-2015, 08:09 AM

I don't remember exactly. A couple of pounds, I think.

Jim Hawkins · 05-06-2015, 11:26 PM

I used a large journal crank in my 327 and the rods are turned down to small journal. I checked before and was surprised how much lighter the large journal cranks are.

05-05-2015, 04:56 PM	#1
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	notes about SBC 327 crankshaft, or if I had it to do over Racers, after spending time with the Super 10 engine research I decided to build a 300/327 engine combo. I think that decision is good and fits well with the Super -10 GT super stock class. I decided on a Dart SHP Pro block, again, I think a good decision. About the crankshaft, after considerable searching I found a suitable 327 factory shaft then sent it to Mile High for full work over. Again, very happy with the work and pricing from Mile High. The problem, main bearings. A few years ago a special thick bearing was on the market that adapted a 327 main to a 350 main [the Dart block is of course 350 main] The thick bearing can no longer be found. After more searching I did find spacer bearings but I did not like the fit. So, align hone the spacer bearings in the block to get the bore true. It is assembled with those honed to fit spacers and all is OK. Knowing what I know now, a new shaft with 350 mains and 327 small pins would have been a better choice and given more bearing selection options. So, maybe my experience might help another race who is considering a 327 build. __________________ Larry Woodfin 471W

05-05-2015, 05:08 PM	#2
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,000 Likes: 64 Liked 777 Times in 193 Posts	Re: notes about SBC 327 crankshaft, or if I had it to do ove A large journal 327 crank is lighter than a small journal crank. __________________

05-05-2015, 06:07 PM	#3
Bill Moulding Junior Member Join Date: Feb 2006 Posts: 58 Likes: 0 Liked 3 Times in 3 Posts	Re: notes about SBC 327 crankshaft, or if I had it to do ove Well that is interesting Dwight. How much weight are we talking about?

05-05-2015, 08:46 PM	#4
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: notes about SBC 327 crankshaft, or if I had it to do ove Both Jegs and Summit , among others, sell Clevite MS1110H Thick bearings, There is also MS1110H-1 available. Hope that helps for the future.

05-05-2015, 11:40 PM	#5
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: notes about SBC 327 crankshaft, or if I had it to do ove ss3011, the spacer bearings are listed in a number of location on the web but when you call "those are no longer available" is the answer. Even though the web site says, "will ship from manufacture" Clevite no longer produces them nor King nor any other manufacture that I could find. __________________ Larry Woodfin 471W

05-06-2015, 02:51 AM	#6
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: notes about SBC 327 crankshaft, or if I had it to do ove Just got off the phone with Summit, they verified they have 4 sets of those bearings in stock ready for shipment.

05-06-2015, 04:48 AM	#7
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: notes about SBC 327 crankshaft, or if I had it to do ove I forgot to explain, the mains are .010" under , that is the problem with finding the thick bearings. __________________ Larry Woodfin 471W

05-06-2015, 08:09 AM	#8
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,000 Likes: 64 Liked 777 Times in 193 Posts	Re: notes about SBC 327 crankshaft, or if I had it to do ove I don't remember exactly. A couple of pounds, I think. __________________

05-06-2015, 11:26 PM	#9
Jim Hawkins Member Join Date: Jan 2010 Posts: 198 Likes: 89 Liked 115 Times in 35 Posts	Re: notes about SBC 327 crankshaft, or if I had it to do ove I used a large journal crank in my 327 and the rods are turned down to small journal. I checked before and was surprised how much lighter the large journal cranks are.