I like the idea of a girdle more than the two caps. That may be the way I go eventually. The only thing I dont understand is why guys put alot of money into beefing up a 109 block. Ive seen guys put in all 4 billet caps and a girdle and the $$'s for the machine work. You can buy a stage block for less than that if you keep your eyes open. I know alot of people say stage motor build ups are big $$'s but I think they're a little wrong. Stage motors are expensive when you go for the radical builds and the crazy HP. You can use almost all stock parts with a stage build up if you go with stock or stock style heads.
If you pick up an off center stage block the only goofy thing you need is a $500 Duttwieller oiling system.
If you pick up an on center block then you need on center rods($400 to $600 for a nice used set), a Bowling green customs on center intake($650 to $700 used), and the Dutt oiling system ($500).
Thats what you HAVE to spend money on. Buying the parts you can spend money on is what drives the price way up. I have a real nice undamaged late 3.8L on center block(the strongest stage block made), a LA Enterprises kryptonite billet crankshaft(one of the best cranks you can get your hands on), 6.5" Carrillo on center rods (good to about 1200 hp), and a bowling green customs on center intake. I have a few other parts also but I only have $3000 in the parts listed. This stage short block set up will probably only cost me around $1000 more than a beefed up 109 build up. Considering that I plan on shifting at 6K or less and that I'm going to run stock 8 bolt heads I dont think I'll ever be able to ever really damage the motor (head gaskets should always fail first) I would also expect the increase in the value of the car to be greater than the extra $1000 or so it cost to build the stage motor.
The whole reasoning behind this is simple. I ran pretty good times on a stock long block because I was cranking on it pretty good. Now I have had two budies with some expensive 109 build ups they had all the $$'s in go fast parts and the only $$'s they had strength wise was the two center caps. Now I cant run with either of those two cars they are out of my league, but they both have a problem. They invested alot (to me and them anyways) of mony in those motors and they a afraid to lean on them to make them run really hard. They can't afford to tear them motors up, and at the HP level they would be at if they did crank them up they know they would be rolling the dice. All those big $$'s spent to be able to make the horse power just to be affraid to actually do it.
Jason
p.s: I will be right in a simillar senerio in a couple of weeks. I will be putting ported heads and intake on my car. Alot of buddies are wanting to know how fast I think i'll go then. I dont think I will go much faster at all. I will be affraid to run much faster on that stock short block. I tell them I will basically wind up just running less boost. So all this work and money over these heads and intake will be just so that my boost gauge shows a few pounds less boost....WOOHOO! Now caps and girdle or stage short block.... I would be shooting for the 9.90 to 10.50 range.