SBC blowby problem

In the last pic that intake valve is pretty far into the seat! I would pull the valves in that cylinder and have a look at the seats and the valve surface,I would bet that you have a bad valve and seat!

 

how do you check the valves and seats

 

also is it possible to clean the valves and reuse them

 

machine shops will put them in a lathe and recut them.....some times they can be reused just depends on how much material is left on them. its just a regular valve job. i think my last one cost $275 for two heads that was valves and new seats. anythng you yourselfdo like lapping them is just a short term fix and will not last long

 

There's not really much you can do at home to fix an issue with leaky valves. Cleaning things up isn't really a solution. It takes too much specialized equipment to grind valve seats and reface the valves.

Depending on your budget you could go at this a couple different ways. You could take the heads to a machine shop and have them rebuilt. They may need a couple new valves, some new seats and maybe new valve guides. For the same or maybe a little less money you can likely buy a set of reconditioned heads trading in your old ones as cores. This might save you a couple days too if time is an issue.

If you've got to take the low-buck approach you might be able to get by with just fixing the valves and seats, and maybe the valve guides on the one weak cylinder. Maybe a little risky but if the engine is in fair shape otherwise you can likey get another couple years out of it if driven sensibly.

Either way, keep in mind that if the rings are a bit tired now you're going to put a little more strain on them by getting the valves sealed back up like new. You're not going to blow anything up, but if you had some blowby before you'll likely have a little bit more after getting the heads sealed back up. But like I said, not that big of a problem as long as the crankcase is vented properly and you keep the oil changed in it.

 

well i called a local machine shop there gonna rebuild both head for 160 soo well see whats up after that