Gold Lifetime Member
Join Date: Jan 2005
Location: 2 Dog Town in West Texas
Re: Type of Valve Seals for Small Block Chevy
My 2 cents worth is , if you are afraid of using those after market type seals, make sure your valve guides are in excellant shape and use the factory style O ring. The positive seal style that I am used to using have a teflon seal on them and seal well but guide boss has to be milled to fit.
The old "Ford" unberalla style gain some use as they would not necessarily need boss milling and would help prolong the use of the guides if it was worn or worn consideribly. So the choice is yours,, your head shop is just trying to do you a favor in turn, but guides need to be in good shape either way.
True the exhaust needs more lube due to heat but the factory style O ring will do just fine, depending on your applications and useage. Intake side needs a good seal especially when hi mileage comes along.
If you ever consider Wionna Bronze guide inserts, they also work well and can be replaced easily but you need to have the insert tool. Another method is the bronze sleeve or guide.. Choice is yours.
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968