I have a pair of AFR LT4 210cc heads that I am gearing up to have ported. I am going ahead and purchasing the valves, seals, guide plates and rocker studs to get ready to have the work done. I need to know what the overall length of a stock LT1 valve is? Nobody seems to know the exact dimensions. I am going with Manley valves and I called them and the tech guy said that he has no idea and to call AFR. I called AFR and he said to call Manley and tell them they just need to be .050" longer than stock which I already knew from their catalog. Manley's catalog has all of the valves listed by the overall length so I need to know the stock length to add the .050". Does anyone know the overall valve length or where I an find out?

Thanks

 

The valve length for a AFR 210 is 4.960 but a 5.010 will put about any valve spring in the head you can imagine.

Bret

 

To rephrase what bret said, overall valve length isnt as important as having a long enough valve to hit the spring installed hieght you're after. some of the springs for the larger (more aggressive) cams can get pretty tall compared with the hieghts you can achieve with a stock length valve... even with +.050 locks.

 

Thanks for the responses guys, it is a big help.

SStrokerAce, I'll PM you.