Local Hero

For my winter beater, I'm doing an extreme budget rebuild on a '75 350. I know that much for sure due to running the block numbers. It is not the original engine to the car and I'll also add that this is my first engine rebuild.

I'm confused on the valves in the heads. I have the 411929 Type 8 heads which jive with the dates on the block.

While lapping the valves and installing new valve guide seals, I discovered a bad valve. It's flatspotted on one edge instead of round. I'm trying to find a replacement for it.

Visually, it's the smaller of the two valves for that cylinder. To me, it looks like it should be the intake valve. But now I'm not so sure after seeing this chart. (POST #4)

https://classicoldsmobile.com/forums...tml#post180704

On the chart, it lists all of the intake valves as being larger than the exhaust. The part in question measures a little over an inch and a half. NAPA says the intake valve would measure more like 1.8" which the chart also confirms.

Can someone please clarify this for me. Is it the EXHAUST valve I need or the intake? I know it's likely a newbie question. But I appreciate any responses.

coppercutlass

A quick way too see is look at what port it came from intake or exhaust. I have a bunch of #8 valves if you need any. Or atleast I think I do. If you are intrested let me know and I'll look in my parts bin. Intake is bigger.

DoubleV

The bigger valves are the intake valves and the smaller ones exhaust.

Local Hero

Thanks for the confirmation guys. Now that I'm looking for the right thing, I should be able to find it locally. Otherwise, I'll give you a shout.

Local Hero

Summit has what I need and since they're local (about 30 min. away) I going there to get it so I can match it up.