1.3 b3 rebuild

[jason_]

Re: 1.3 b3 rebuild

I've been working with the head, nothing of the block. This goes bad i do have an extra head. Unfortunately this head I'm working with has the best cam wear, since these heads don't have cam bearings.

[jason_]

Re: 1.3 b3 rebuild

Found some clevite pistons. But according to their piston height, it's 1.12"!!

I'm stumped.

Edit

Just called them, 224-2557, showing 1.12. He said himself that doesn't seem right. He said that they get those from silver light if I heard him right. He wants me to get some factory #s from the original pistons, and go from there.

I'm going to call wiseco and get some cross reference information.

[blkfordsedan]

What do the factory pistons measure from the top of the wrist pin bore to the top of the piston? How does that compare with the Sealed Power pistons?

[jason_]

Re: 1.3 b3 rebuild

What do the factory pistons measure from the top of the wrist pin bore to the top of the piston? How does that compare with the Sealed Power pistons?

I'll post those in a few hours. I'm @ work, having someone @ shop measure.

[jason_]

Re: 1.3 b3 rebuild

Alright, did some measurements.

Stock were 1.12, clevites are 1.12. Here's the best part, these sealed power I bought stamped on box 1.76, caliper jaw ends up in the blue yonder, I have no idea where they're measuring to and from. Regarless they do have a shorter head height. And now I'm upset, the motor I put together already, I just assumed everything is the same, so I going have to take the risk that even though I milled 0.038 off, pistons might have more dish and lower head height, so possibly no gain or a step back. Hard for me to judge, as that was an automatic, which I have no time behind besides a test drive, and this current project is going in front of a manual gearbox, which I've been using for 60,000 or so. Oh well.

Anyways, manufacturer numbers skewed the program, I did measurements myself. Next step is to order those clevites, and the shop that hung these sealed power said he'll buy back, and I'm guessing he might hang the clevites on them. I was going to put the head together, I'm going going to wait and do some CC measurements and see s the same, if they're deeper, might mill a fuzz more off.

Anyways, that's where I stand. Jumped the gun and don't go by #s on the box.

[jason_]

Re: 1.3 b3 rebuild

Clevites/silvolite is the answer

Federal/sealed power is a joke.

Stock piston face/valve cut were roughly 5cc.. Federal/power were almost 7cc, plus lower head height . These Clevites are 3cc or so, head height dead on 1.12" too...

And I got drunk and wild, didn't pay attention to position markers, ended up scraping 0.055" off the head. Combined with a now fuzz smaller combustion chamber, and then plus these shallower dish pistons. Eek. We'll see how she runs on mid grade..... :/ may have to buy a lower thermostat...

Head is polished like a mirror. Did some porting, nothing special. New exhaust valves with more meat to eat up chamber volume. I punched guides out, and ordered new ones from SBI, $1.80 each or so. Gotta rig up a hill Billy press to push them in, then should be able to get the head together and bolted to block. Sometime this summer I should get it together and let you guys know how she runs with these new specs.

I was in a hurry to swap as the current 1.3 has over 350,000 miles, and I'm burning about 2qt of oil to a tank fill, but, since it's been snowy, and driving more reasonable, doesn't burn oil much at all. I guess foot to the floor in overdrive doing 90 and bouncing rev limiter burns a few drops now and then. H'm.

But, my ton Chevy needs gearbox overhaul, and I need to add a pto hydraulic pump, , she taking forever to synch, to the point faster to double clutch or not clutch at all, and bearings sound like hoolahoops dancing in the races... Ugly heavy nv4500...

So, too small of a garage, not enough time, and too many projects. I'm sure that sounds familiar.


So anyways, update on parts and the build. Apologize for the delayed follow up.

Sent from my PC36100 using Tapatalk 2

[blkfordsedan]

That's not totally uncommon. I've seen several replacement pistons with a lower CD and more dish, but usually the cheaper ones. Good luck on the build.