alright, thanks for the good info, looks like the 2210c is out the door, will a 2300 work for awhile till I can afford a 4 barrel upgrade. (seems alot of my rebuild money is going to be sunk into machine work instead of other parts)
as for the previous bore....none of the pistons where marked with any kind of overbore. Wrist pins all were good, a bit sloppy, all bearings showed extreme wear. One piston had a valley around the whole piston wall, half way down the cylinder thats why the machinist said it would have to go .060 the groove was extremely deep and wide. Crazy thing is the engine was running pretty smooth, had rough time when cold, dead cylinder, think that was the flat cam lobe, once warmed up it ran very smooth, exhaust was clean after warm up, heavy black clouds while cold, carb was jacked up behind help I think, fouled plugs in minutes, turned black within 10 minutes of idle.
That explains it!
Something was down the hole and ate the cylinder wall. That condition is not caused by pre-ignition or detonation, especially in only one cylinder.
I really see no reason to go with a 4v manifold unless ya want the bling. In the case of these engines, unless you are building a high-end "puller" motor that won't see street use, a properly set up 2v carb system will work just fine.
Spend the cash for a performance ignition system worthy of a fresh motor, that will make more difference in seat-of-the-pants than anything else.
The Holley list 7448 2v modular carb you see references to all over this forum is the go-to unit for what you are doing. That is the 350cfm-rated unit.
However...considering the cam you are using, it's "possible" that the list 4412, 500cfm-rated mixer might actually work on the fresh 345. It does not work well on a stock/tired 345.
I can't say positively because I've not personally tried a combo like that. But...in the next several days, I'll be installing a 4412 on my 392 using an adapter so that I can play around with this combo and see what happens. The difference between the 345 and the 392 would be inconsequential in this regard...the cams are the same though my motor has a slight bump in the cr (9.0:1 so the build sheet sez), I still run regular grade fuel in it, I won't build anything for street use that can't run regular.
And I have no idea if the cam in my motor was actually degreed-in during installation (I doubt it!). The motor was built by a so-called "reputable" performance engine builder 22 years ago and then the vehicle set after accumulating less than 3k miles and was only brought back to life a few months ago. Thus Robert and I have had this same discussion regarding the 260h comp grind and the crappy idle quality in regards to the IH tractor motor.
However, this motor still had the oem smog carb on it which in no way would ever work properly. And that carb has been totally built by me with several "mods" to try and improve drivability, it simply won't work. So the engine builder did not deal with the most important part of the equation originally and I'm 90% certain that is why the vehicle was parked and then essentially abandoned. More to come on whether a proper carb setup with this particular cam will make it play nice!
What is your time frame here for your engine completion? I might be able to "front" ya a 4412 Holley to try at no expense to ya other than shipping...a "loaner". But I want to try one first on my motor and see what happens. I do the "loaner" deal on occasion for our customers so they can play around with stuff before making a final purchase. We don't loan engines or transmissions though! My loaner 4412 is currently out on loan and installed onna 304 just to provide a fresh carb that will run the motor for testing, but it will be back here at the shop real soon, I have two others that I just need to assemble and complete.
Robert knows all this "cam stuff" far mo'-better than I do, he'sa student of some of the real pros in the cam bizz and builds funnycar motors as a sideline/hobby also! We have alotta fun around here with our customers, but we don't sling worthless bullshit about IH motorbuildin'!
