Intake valve guide seal

on the intake there is sucking which brings the oil in the coumbusyion chamber. on the exhaust there is push so the oil is kept down. no need for a seal
 
Prior to 48 (8BA) there were no seals on either guide, these were the 2piece giude for the mushroom5/16 stem valve. The 8BA used a seal on the intake only to prevent vacuum from drawing oil into the combustion chamber. The guide fits pretty snug as most know when removing the valve/guide assy. I haven't used seals here for the past 20 or so years, I install a thin film of RTV on the intake guide prior to assy. and alittle never sizs on the exhaust to help the next person remove the alve.
 
In my opinion, the seal on the intake holds oil from going through the guide, helps with the vacuum, AND holds oil in the guide...
With the exhaust, there is pressure that blows the oil out, and prevents the oil from getting into the guide from the crank case atmosphere... Karl
 
there is little presure on the exhaust guide as the exhaust exited the eng. these engs were not designed for inter planet travel . so the desine is a little crude.you want a good runing flathead leave it stock the more crap you do to them the worse they run the more fuel they use & the hotter they get if your building a show mechine thats different. french podles don,t make good hunting dogs .if you have an old car & you change every thing you might as well buy a new car .drive them stock & see what your perants had to deal with.
 
The original 8ba exaust valve guide did not have a groove for a seal. I guess that explains how FOMOCO felt about it.
 
Richard Crow., for the past 50 plus years I'v build hunderds of Flathead engines many for racing, but most for street. I'd like to say the street engines are more economal than the originals. I'm at present building an engine with improved economy. It will use up graded ignition and fuel systems including EFI jut for the enjoyment of it. Keeps me from stealing hub caps.
 
old ron most of us are not as talanted as you in the mech dept. thats why i say for the novice keep it simple. it,s a hobby. when i was young just about every body did work on there cars to save money. today with modern teck. that is imposable. i looked at at new ford feseta the orther day the salsman said the yellow knobs & handles is all the owner should touch the other stuff is for the ford teck. my grandson has a g.m.c pick up fuel pump went bad 800.00 to repair.pump alone was almost 400.00 net.
 
You're right Rich, The new stuff is very complicated. I'm fortunate to have a grandson that loves these engines and is a computer savy guy. He's in collage now and this truck is for him. I drove the KB-1 for a few years untill the engine went south. Droped in a 51 merc and merc o matic and drove it until the rods started knocking. Next came a SBC 350/350, that lasted for about 5 years and I decided to make the truck a flathead test bed. Famaly problems stopped this and the truck sat dormant for the next 5 years. At my age I knew it would be junked, so I gave it to Ben and now it's fixed up better than it ever been. But NO fancy paint job.
 
You must log in or register to reply here.
Back
Top