Don Terrill’s Speed-Talk

Definitely j63 for single stage finish.
I'd think a plateau finish should work better, but I did a LOT of them like that and people like it.

2 strokes don't have chromoly bores, they have nikasil plated aluminum cylinders, or an iron liner pressed into an aluminum jug. if you are working with nikasil, it is very different from an iron sleeve. Moly 2000 chrome-moly iron along with Moly 2000 iron are the most common iron sleeved material ...

I would guess it has been re-sized. Check length.

I agree they "should" not be re-sized, but I do lots of things that "should" not be done. sorry.
people have different opinions on the matter, and that's fine.

The idea that the ring and cylinder are the same temp must be wrong. Thew ring is cooled by the cylinder. In order for heat to transfer from the ring to the cylinder, the ring MUST be hotter than the cylinder. the MORE heat is being transferred, the higher this temp differential will be. so, you hav...

Tighter is not always better. In the 60's, 70's a lot of bearing clearances and skirt clearances were aimed near the minimum, because the engineers had a general expectation that they would wear looser, because that's what used to happen. But all along, as materials, and lubricants and filters, and ...

You forget a very important thing; how the ring fits in the groove. The ring lands of the pistons become wider and tapered and rounded. The more wear.... the more the ring has to TWIST and bend to seat between beat out groove and tapered/ovaled cylinders, ultimately causing the ring surface to be ro...

A little exercise is good for you.
If I had to do them more often I'd like to get an adapter to use the Rod honing mandrels in the ck-10.

Compared to the average car engine of 30 years ago, Do the newest engines have tighter bearing and piston clearances? And If true, is this possible because of more precise machine work? pistons yes, hyper-eutectic alloys and better skirt designs. Certainly pistons are better and cheaper than ever b...

The best way is hone the axle bore for the tightest fit possible. Ream or bore to within maybe .002- .005" short of size and hone from there. You can even use a slight press fit, the main thing being that the kingpin can be pressed through without scraping it up. Should be hardened. I worked with so...

Generally the venturi should be between 75-86% of carburetor bore so 36 IDFs could use a 27mm venturi, which is actually HALF the size of a 38mm venturi So they DO make carburetors "small enough" 8 small throats might be a great idea for fuel distribution, but maybe not flow. The wall friction of 8 ...

4 IDA carbs on an IR intake would be sized right for somewhere around 500hp

4 IDA carbs on a plenum would be sized for around 1500hp
Not enough velocity to function
You would need to use two IDAs, not four. Or four of the smallest IDFs

"that they will be mounted on a Holley 300-275 tunnel ram"

That's not a good idea. Why would you even do that. I really want to know

I agree,
"a few thou per side" is exactly what came to mind.

If the engine and it's mountings are heavy and strong (rigid) enough then the vibration is not really important.
90 degree twin should be a lot smoother than a single. A twisted crank v8 is basically 4 v-twins connected for even firing.... as far as balance is concerned.

if you want to use a v8 block....maybe, a pair of pistons, the other would just be along for the ride to make it into a 90dgree v twin.
Balance the crank with one bobweight OR make collars to bolt on the other crank throws for balance and to block the oil holes also.