Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Stock SBC 350 Crate Motor valve chatter under load
View Single Post
  #24 (permalink)  
Old 01-23-2013, 08:22 PM
71fj40guy 71fj40guy is offline
Registered User
 
Last photo:
Join Date: Jan 2013
Posts: 51
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by UPandComing View Post
Awesome progress, i can tell you with a certain degree of certainty that the 2 cylinders you are having trouble with either A) have a bent valve or B) are in need of a simple valve job, i dont recall what kind of heads are on the car are they stock? if so they probably need a freshen up, if they are out of the box heads and bolted directly on it is a COMMON problem that when new cylinder heads are built the tolerances are WAY wide, i would recommend taking the heads in to a machine shop have them cleaned inside and out get a 3 angle valve job done to guarantee a tight seal AND!!! when reassembling the engine remember to index the spark plugs, this last part is very important and will effect the overall way you're engine runs, the machinist should check valves for straightness, grind the tips if needed, test the spring pressures to ensure they are within spec, and new valve stem seals, i think if you go this route you will be VERY happy and satisfied with the result. also by removing the heads you will be able to inspect the cylinder walls this will be good because if you have a broken ring (which i dont think you do) you will see heavy oily buildup on the piston face or even excessive wear on the cylinder wall its self, just remember what you do on one side you should do on the other otherwise you may end up chasing gremlins, and on a side note in regards to you're short springs, some engine have shorter springs on the intake side if im correct and there usually is shims underneath to set the proper height. i hope all my jawing helps out
Thanks for the info, I really just want my Land Cruiser running right and this issue has been kicking my butt.
The heads I have are
P/N 93438649 Cylinder Head Assembly with Valves for 290HP
They came installed on the 290HP 350 crate motor.
I guess I need to call around and find a good place in San Diego County to take in my heads.
Reply With Quote