i'm starting to plan out my engine plans for later down the road.. I would like to make an 327, 1pc rear main, around 6300rpm. All this will be in a 5spd 92 RS.

but now I remember a conversation I had with a machine shop owner back when the 87 was on it's first engine. I had suggested 327 back then also.. but he mentioned that if I wanted a 1pc rear main, I would need to have SCAT, Eagle, or Lunati make me a custom crank. I don't know if anyone sells a 3.25" stroke crank for large journal small blocks now or not. In any case the machinist suggested that I stroke a 305, and get S/R torquer heads, port them, 3 angle valve job, and put in whatever cam I'm keen on. Apparently he's done this with great success. He said as long as you do the rebuild right, and get the flow up, a stroked 305 will suprise just about anyone.. I know it won't be a 327, or a 350. But it would be a lot easier than a 1pc 327 right?

At any rate, I still want the 327, just b/c I like 327's. But i'm interested in comments on a stroked 305. I guess I would think that with proper air-flow(seeing as an engine is just a glorified air-pump.) a stroked 305 would almost be ideal. With bore and stroke being almost equal. So, gimme your thoughts.

Anthony

 

i'd run a 2 piece 327 if that's what you like and i'd run a 327 over a 305 anyday

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ICON Motorsports

1st & 3rd
MM Black Diamond 538 F&AM

 

You can put a two-piece rear main crank into a 1-piece block with an adapter (large journal 327 cranks are available, or use spacer bearings). That would probably be a lot easier than the 334, since you'd have an internally balanced assembly with the 327 but not the stroked 305.

I don't know of anything that makes equal bore/stroke "ideal". Typically, the formula is oversquare for power, undersquare for torque/economy.

Why are you fixated on a 1-piece rear main? You aren't going to make a 327 out of your 305 block, and you certainly aren't going to find a factory 1-piece 327 crank. A 1-piece 350 block with the aforementioned 2-piece 327 crank to keep a roller cam, okay. The 334 stroker in your 305 block, okay. But, like your machinist says, a 1-piece 3.25" stroke crank is going to be a specialty piece.

305 stroker kits are available for about $900 (if I recall correctly) with the externally balanced harmonic damper and flex plate (w/.030" over bore and some grinding on the oil pan rails for rod clearance). It's an attractive concept, especially if you don't have a roller 350 block. The main issue is the small bore limits valve size, and tends to shroud (read, "limit flow") what you CAN put in there. So, a 331 (.030" over 327) will probably outrun a 334 (.030" over, 3.75" stroke 305), all other things being equal. And, a 355 (.030" over 350) will probably outrun them both.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam and intake, World 305 heads, Hooker headers & y-pipe, 3" Catco cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" Hedders, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere w/open diff & slipping tranny. Daily driver while Camaro was being put together.

 

my fixation on the one peice is so I can use the flywheel off of, or a new flywheel already for my car. I always thought the flywheels had different mounting patterns on 2-pc, and 1-pc. or that you couldn't put a T56 on a 2pc? Have I been horribly misinformed. I would really prefer to have a 1pc rear main, going with 2pc is like taking a step backwards. When I do this swap, cost isn't going to be a determining factor, in the way it usually is, so a custom crank is not out of the question. I like the 327. thanks for the responses.. I just thought it would be an interesting topic.


Anthony

 

That's the first time you've mentioned a T56. I'm not the most informed on manual trannies, but I was under the impression that the flywheel was not the real issue there. But, that can be handled by someone more in the know.

I like the one-piece myself, but mostly for the roller cam. If you can swing it, a custom 3.25" crank would give you a unique combo that would rev easily up to your goal. Like I said, it would certainly have more power potential than a 334.

 

I kinda just threw the T56 out there.. I plan to rebuild the T5 and reuse it.. no powershifting for me! Right now my only basis for wanting a 327 is "just cuz".. it'd damn sure be rare.. and they rev high and fast..

To be more specific I don't even plan to do this in the next 4 years. When I graduate college(hopefully with honors, and a degree in Mechanical Engineering.) that's when all of this will happen. I may learn something during that time to actually justify doing it.. or not. either way when I graduate, the 305 is coming out, and SOMETHING bigger is going in.

Anthony

p.s I'll be attending The University of Texas at Arlington, big factor in that decision was their outstanding record in the Formula SAE design competition. in short, they've won overall, and individual categories more times than anyone else.. in some areas more times than everyone else COMBINED. just thought I'd add that.