Cracked Exhaust Ports
- Thread starter 2006 LBZ
- Start date
ive had to deal with II's lack of being able to clock injector bodies correctly in person as well. Its obnoxious.
Sure is! I agreed with them to just send me some t shirts and hats to cover the cost of the first set of head gaskets since I didnt want to wait for just head gaskets to come across the border, sad part is the one II work shirt they sent me even has their logo crooked on the back :rofl: We got a good laugh out of that when the stuff showed up at the shop!
Just easier to get my own gaskets in Canada, the shirts were only for the cost of gaskets.
They either had a couple, maybe a dozen bad cores or the cnc program has or had a error in it, these heads cracked right at the thinnest section of the exhaust ports, I`ve got a cut away that shows the exact crack but its lent out to a guy right now for r&d purpose.
Now how do you explain a piston that looks like its been hit by a screwdriver or something, etched right through the coating..... II puts the heads on the motors at their shop as far as I know.
Now how do you explain a piston that looks like its been hit by a screwdriver or something, etched right through the coating..... II puts the heads on the motors at their shop as far as I know.
I thought Randy built the heads for II???
Mine must have been put togather with left over parts or something, take a look at spintron testing of valve trains and tell me having the exact retainers for your valve springs isnt important.
Randy does good from what I've heard im buying his screw in cups and having a local shop machine some other heads
im buying his screw in cups and having a local shop machine some other headsRandy does good from what I've heard
With the exception of the scratches in the coating on #8 piston the short block has been okay, Heads not so much. I`ve been dealing with these issues since easter 2012, Trying to find a winter beater to drive and pull this motor down to nothing and start over.
I understand where you're coming from, they screwed me several times! I'd say of any company I've dealt with in the last 10 years they're by far the worst. I hope you can get it worked out. I've always been happy with what I've received from Socal Diesel.
Randy is meticulous. When stuff comes from him it's exact and everything is done right. Those heads weren't right and one of them was screwed up to begin with. Randy doesn't do things that way......I'd be real surprised if they were from him. I think they were probably takeoffs that were laying around and came from some other scource, maybe even something they'd done themselves. The piston sounds like handling carelessness at II.
^ this was my thoughts id try calling randy and ask him if he did im pretty sure he'd stand behind it no questions asked if he did those heads
While Randy himself may have a good reputation, his shop and employees are not perfect, nobody is. A couple sets of delipped pistons were bought and installed up here in New England that were anything but perfect and protruded .018" out of the deck in some cylinders in 2 separate motors. Nothing against him personally, but that is not impeccable work
I've been to his shop a few times and talked with him a bunch. The shop is impressive and he's absolutely meticulous. I don't remember how much protrusion is on my engine. It's true that anyplace can make an error. But if a block isn't squared and exactly flat there can be several thou. difference in deck height from one end to the other, and between lowest - highest hole. That's why there are different gasket thicknesses.
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where does 0.018" protrusion fit into this chart with out using a decked gasket?
Cylinder Head Gasket Grade
Ti Max (Piston Projection)
Compressed Gasket Thickness
Metric (mm)
English (in)
Metric (mm)
English (in)
Grade A
0.223–0.274
0.0088–0.0108
0.90–1.00
0.0354–0.0394
Grade B
0.274–0.325
0.0108–0.0128
0.95–1.05
0.0374–0.0413
Grade C
0.325–0.376
0.0128–0.0148
1.00–1.10
0.0394–0.0433
Block Over-Bored 0.010–0.030 in (0.254–0.762 mm)
0.223–0.376
0.0088–0.0148
1.00–1.10
0.0394–0.0433
Block Over-Bored 0.010–0.030 in (0.254–0.762 mm) and Deck Milled 0.008 in (0.203 mm)
0.4257–0.5777
0.0168–0.0228
1.25–1.35
0.0492–0.0532