1911 build from 1.7 which budget parts from AA, Hold my hand like a child Options

[nditiz1]

So I'm debating doing the top end on my 1.7 I recently dropped a valve on.

Looks like I can buy all items from AA performance. Can I just buy the 1.7/1.8 96mm P&C and the 1.8 AMC heads and call it a day? I'm getting confused on what I read about opening to 105mm bore on the 1.7 heads for 96mm Pistons. The AA website talks about modifying heads to 103mm bore. I guess I could also just use 2.0 heads, but my tin wouldn't match.

Sorry for being dumb...

[Superhawk996]

Plan on opening the heads.

The NPR 96’s have too thin of cylinder walls and a very thin sealing surface between the top of cylinder and the heads. This was not a good combo for reliability. NLA but occasionally pop up on eBay and the like. AA performance 96 won’t have this issue.

Discussion of how much the heads are to be opened should be based on parts in hand. I wouldn’t tell a shop what to open them up to based on internet posts.

In my opinion putting 2.0L heads on just causes all sorts of drama. Either build a simple 1911 or go whole hog using the better 2.0L heads, 2.0L crank, rods, to build a 2056. Just my opinion.

My original 1.7L was my very first engine rebuild (other than lawnmowers, go karts, and cycles) back in 88’. Built to 1911, opened 1.7L heads and was reliable to the tune of 100k miles and was a nice bump in torque over the stock 1.7L.

Note: if you dropped a valve and are reusing heads - pop for larger valves if they are doing seat work anyway. Or as you say, buy 1.8L heads.

But. . . man . . . If I’m buying heads - why not buy 2.0L? . . I get it $$$. 2019 or so I sold a 2.0L core crank (regrindable) for like $45. 2.0l reman rods are pretty cheap from EMW. See where this leads (IMG:style_emoticons/default/headbang.gif) yeah, I’m probably building a 2056 if I’m buying heads.

As you correctly stated, tin is the crux of it. Can modify tin but PITA and new tin pricey and not yet available new last post I saw from whomever was supposed to be making repop.