General engine building question

[Dsg-shaker]

Okay this is for engine builders/machinist of svtp mainly; I have a project car I've been working on and while I had the block/rotating assembly at the machinist he mic'd and ordered bearings for the connecting rods and end caps. (piston rings where also ordered.) now the questions are:
1. should I recheck before assembly the clearances again. 2. for packing the rear main seal (rope type) is there any alternate seal or is that it? Pros/cons?

 

[Nvr_Spds]

What engine is it? How much do you trust the machine shop?

 

[Dsg-shaker]

1970 Pontiac 400, the shop does all the machine work/rebuilds for a company I work for and almost never has any issues

 

[SID297]

Yes you want to check clearance on everything, especially the bearings. Not sure about the seal, but I'd switch to a one-piece if possible. I'm not a fan of rope seals, they leak if you look at them the wrong way.

 

[Dsg-shaker]

Yes you want to check clearance on everything, especially the bearings. Not sure about the seal, but I'd switch to a one-piece if possible. I'm not a fan of rope seals, they leak if you look at them the wrong way.

Correct, looking at my notes that was taken by him and later from me, they are within factory stance, but it wtill makes me iffy. The seal I would love to go to a one piece but I have not seen much for pocho engines and updated seals

 

[03OxWhiteMach]

There is a company called BOP Engineering that makes a two-piece rear main made out of Viton instead of a rope style.

From what ive read, as long as you confirm that the two pieces are concentric this is a better seal than the rope style. If you have the whole motor apart for a rebuild, it shouldn't be a problem to check.

If you use a rope style, use one made of graphite.

 

[Robert Francis]

You always check for specified clearances while assembling your engine. Checking parts spec's for fit and actual assembly where your stressing and stretching parts as you tighten bolts and nuts are two different things.