Can anyone tell me if I need to change the valve guides or seals on the 62 hi-comp 394 heads to run the lead free gas at the pumps these days.The insurance tag says she was last on the road in 87 so not sure if they would have been done before that or not.Can't remember when we switched to lead free gas in Canada.
Cheers
Greg

 

You will get valve seat recession, especially at high power, unless you use a lead substitute.

 

Thanks for the prompt reply,so does that mean that I have to use a lead addative all the time or is there some other solution?
Thanks
Greg