leaky valve cover afr or risque pcv breather?
Thread Starter
Burning Brakes
Joined: Aug 2000
Posts: 1,146
Likes: 2
From: Albuquerque NM
leaky valve cover afr or risque pcv breather?
I have a newly running 427ci SBC. It has a MAJOR oil leak, which prevented me from doing any dyno runs. But after putting two qts of oil in, I was able to drive it home.
The heads are AFR, which I have heard to have puddling problems near the outside corners. was there any fix to this?
I went with a hard MrGasket valve cover gaster vs my normal hitech silcone ones dry. Should these be used? Should I use sealant (first ever for me)?
The valve covers are tall al sheet metal type that are center bolt. Since I could never get the passenger side flat, I converted the pass valve covers to use all eight screw downs. The side that does not leak is the drivers side with only center hold downs.
The issue is the PVC/breather system. I have a healthy vacuum for the PCV, but I am unsure of the breather. I fab'd a line to the same port on the throttle body as stock config. Does a 427 ci need a different breather solution?
The heads are AFR, which I have heard to have puddling problems near the outside corners. was there any fix to this?
I went with a hard MrGasket valve cover gaster vs my normal hitech silcone ones dry. Should these be used? Should I use sealant (first ever for me)?
The valve covers are tall al sheet metal type that are center bolt. Since I could never get the passenger side flat, I converted the pass valve covers to use all eight screw downs. The side that does not leak is the drivers side with only center hold downs.
The issue is the PVC/breather system. I have a healthy vacuum for the PCV, but I am unsure of the breather. I fab'd a line to the same port on the throttle body as stock config. Does a 427 ci need a different breather solution?
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
The problem with older AFR heads is poor oil return and the outer edge lip is so low. You end up with oil above the gaskets. I hogged out the oil return holes and on a vertical mill I machined a 1.2 wide trench right down to the spring pocket surface.
I use the tall Dart cast covers with the silicone gasket with metal hole incerts. I have not had a leaking problem.
Glad to see another 427 sbc out there. I have a 434 motown small journal motor
I use the tall Dart cast covers with the silicone gasket with metal hole incerts. I have not had a leaking problem.
Glad to see another 427 sbc out there. I have a 434 motown small journal motor
