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Discussion Starter #1
I'm putting a B20 together for my '67 1800S, got a stroker crank done by Paeco in '90 and never used. Anyone know about these cranks? I'm wondering about reliability etc...<p>Tempted to just build the motor the same way I had prior; 2130cc pistons, balanced, Stage 3 VCS head, VCS intake manifolds, 44mm Mikuni carbs, Stahl header...<p>On paper the 2.5 Stroker should make approx 220hp...
 

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Re: B20 Stroker Buildup (volvoracer)

I'm not clear on whether that's a new billet crank or one that was offset ground. For 2.5L w/ 92mm pistons, stroke would also have to be around 92mm. I don't think you can grind a stock crank to anywhere near that. ???<p>How well the exhaust ports flow will determine the max power potential. I don't think you'll get 220, but you can get near 200 and have a very fat torque curve.
 

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Re: B20 Stroker Buildup (Phil Singher)

Looks like a re-grind to me, not a new crank.<p>Likely a 2.3 set up...as you say 2.5 would involve serious geometry changes to the crank.<br>I'll give my Shop a stovker and this stroker for side-by-side evaluation.<p>Stage 3 VCS head flows very well, so I err on the high side of calculations.<p>Machine Shop has to pronounce this crank as usable before I decide to try it.
 

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Re: B20 Stroker Buildup (volvoracer)

I had a crank offset ground last year, and my super-experienced machinist sent it to a specialist on the east coast somewhere to have that done. It was welded, index ground and then nitrided. That one I trusted...<p>I don't have any direct experience with VCS or R-Sport heads, but I understand they were different castings from any of the stock heads. Of those, the F ports out the best, but it's still always the exhaust ports that ultimately set the HP limit. I'm using an Enem K19 cam -- 246 degrees @ .050 lifter rise / 296 seat-to-seat and .472" valve lift @ .016" lash in my 93 x 80mm (2174cc) street performance engine, and it makes a very tractable 200 HP. Maybe you can get 220 from a stroker with more cam than that with one of those heads. ???
 

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Re: B20 Stroker Buildup (Phil Singher)

Adam,<br>My block is currently being sonic'ed to check casting thickness - as I'm also in the early stages of building a stroker (not yet sure if 2.3L or biting the bullet / billet of 2.5L.<p>I too, am north of Boston (Marblehead) - and also pulling a '70 P1800E together.<p>Where are you located? Conversation at Maddies, perhaps?<br>Tom<br>
 

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Discussion Starter #6
Re: B20 Stroker Buildup (VBigDog)

Hi Tom,<p>sorry so long in replying...<p>I'm still on course to build a stroker b20. I'm adding an Isky "R" cam and a VCS/R-Sport Stage 3 head I bought new in 1985.<p>Who is your machinist?<p>I've used Precision Motorwerks (Kent Jones) in the past...<p>Hope to build up the mill over the winter as I'm getting my car back in April/May.<p>Best,<br>Adam
 

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Discussion Starter #7
Re: B20 Stroker Buildup (volvoracer)

I just spoke to Dave at Granite State Balancing.<p>I'm dropping off my B20 stroker crank and '75 block there in the next few weeks.<p>I offered use of my bore plate for any other B20 jobs going on there.
 

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Discussion Starter #8
Re: B20 Stroker Buildup (volvoracer)

Dropped off my '75 b20 block and stroker crank at Granite State Balancing in Marblehead for evaluation.<p><br>If the Stroker crank passes inspection, I may sell it off and stick to my old recipe; a 2130cc motor with my tried & true Lindskog-balanced stock crank...
 

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Re: B20 Stroker Buildup (volvoracer)

Let me know how that works out - <p>I'm sorting the top end at the moment. Planning to send the cylinder head out for a 5 axis port job.
 

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Discussion Starter #10
Re: B20 Stroker Buildup (VBigDog)

check yer IM (instant message) <p>I'm selling my Stroker Crank and a set of Steel T-Gears also.
 

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Discussion Starter #12
Update:

All parts back from Granite State Balancing, went with my old trusty B20 w/ new Mahle 92mm pistons, and a new ipd "R" cam...


BTW, does anyone one know if the Isky "Hardenable" 202-H lifters are the same as the ipd lifters? I got a set form Isky, but the lifter faces look polished, rather than hard-faced...
 

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Discussion Starter #15
Update: Stock (balanced) Crank, ipd "R" cam & Steel Timing Gears installed in Block.
I sized the rings, next have to fit rods and pistons to block.
 

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Discussion Starter #16
Painted block & head.
Pistons & rods going in shortly...
 

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Discussion Starter #17
Waiting on Mahle to send me correct Piston Circlips...
Crank is installed.

Ordered ARP head bolts & studs.
 

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Discussion Starter #18
Got Mahle piston circlips, fitted to #1 Piston, fit piston to crank with Plasti-Gage, mistakenly spun engine 1/2 turn w/ Plasti-Gage in the bearing...now engine won't turn...backed off rod nuts, engine turns again...odd.
Plasti-Gage told me I was at .0005 or .0007...alarming as it should be .001...seems too tight.

Will clean off the bearing and try again...

Anyone had this happen to them?
 

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Discussion Starter #19
OK, I'm a dunce.
Measured the new Rod Bearing shell, it is for a re-ground crank.
Measured another set I had laying around, .007 smaller diameter.

Will fit correct size to Rod #1 and I predict it will fit properly...
 
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