I am so fucking tired of every aftermarket business (whether it’s suspension, engine, drivetrain, interior, etc) always saying how bad oem tolerances are.Editing this post so everyone keeps the pitch forks at bay. JPC/RGR are taking care of everything.
Got the heads back from RGR last night. Some surprises.
Heads were decked and polished. The valves look mighty purrdy.
Nice and clean exhaust ports and mating surface.
New PAC Racing valve springs and Ti retainers are in
Peak at the bronze guides
New FP valves I mentioned earlier in the thread
Now to the surprises. First, combustion chamber wasn't smoothed/machined. It was polished, but still retains the factory CNC ridges.
Inconsistency in the ports between heads (specifically on the bottom).
When I spoke to JPC/RGR they said it's because the CNC program is set to "port" to specific tolerance and these areas exceeded the tolerance (read: shitty OEM tolerances were too off). That's all fine, but I would have expected clean up by hand after. Exhaust ports on the same head are similar.
Lastly (and most concerning), I was also surprised to see that the heads weren't thoroughly de-burred. The little metal ridge below is similar across all 16 head bolt seat areas. This is how they come from the factory...but I would have expected these to be de-burred. Not super into the idea of putting this on a recently re-built short block.
Sigh...not entirely sure on the path forward. My gut tells me I should de-burr those and leave the rest alone until Tim at MPR gets my entire long block for a refresh in the future. Thoughts? If agreed on de-burring, recommendations on tools/methods?
I expected a bit more for ~$4,500. No blueprinting documentation/flow numbers were included either. Ugh.
Thanks, ya'll!
Definitely wasn't my intention. When I spoke to them before I left the conversation mostly thinking I should have asked more questions before sending the heads out. No bad feelings.
That's awesome assuming you're both on the same page for what needs to be done....
Damn that's scary stuff to see. I'm convinced this is the type of thing that went through my oil pump gear.When I built my Boss motor, starting from a bare block... I was surprised at how much machining was lift "dirty" and I did get a small file to knock everything off prior to assembly.
Who are the sleeves from?Just got a special delivery. Everything looks absolutely perfect. Will post high res photos tonight after work. Totally drooling right now.
They're from Darton
Definitely been drooling over them. Can't wait to get it back together and put the power down!I always LOVE seeing pretty and expensive engine guts, that soon will never see the light of day again....
