The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Breather/oil-fill tube in later-style intake

*lakeroadster* · 08-06-2010, 06:40 PM

I did this on my Model A that runs a '70 Chevy 350 SBC and old aluminum "corvette" valve covers. I had an Eldebrock RPM intake machined to use the old intake style filler tube and then put a breather on it. The RPM intake had the boss there, just needed the hole machine for it.

I found out the hard way that the crankcase needed more room to breathe. On a new engine that isn't broken in, or on an old engine that has a lot of blow by thi will be an even bigger problem. In my case, with a newly rebuilt engine, I blew out the manual Holley gas pump gaskets and spewed oil all over the headers, thought I had blown up the engine! Luckily I rebuilt the fuel pump and all was good.

I changed the oil filler neck to the type that is used on a '66-67 vette, it is equipped with a PCV Valve fitting. I also added a Moon breather in drivers side "vette" valve cover.

It has worked fine since these modifications.

I hope this helps.

08-06-2010, 06:40 PM	#14
lakeroadster Account Suspended Join Date: Sep 2009 Location: High Plains of Colorado Posts: 2,485	Re: Breather/oil-fill tube in later-style intake I did this on my Model A that runs a '70 Chevy 350 SBC and old aluminum "corvette" valve covers. I had an Eldebrock RPM intake machined to use the old intake style filler tube and then put a breather on it. The RPM intake had the boss there, just needed the hole machine for it. I found out the hard way that the crankcase needed more room to breathe. On a new engine that isn't broken in, or on an old engine that has a lot of blow by thi will be an even bigger problem. In my case, with a newly rebuilt engine, I blew out the manual Holley gas pump gaskets and spewed oil all over the headers, thought I had blown up the engine! Luckily I rebuilt the fuel pump and all was good. I changed the oil filler neck to the type that is used on a '66-67 vette, it is equipped with a PCV Valve fitting. I also added a Moon breather in drivers side "vette" valve cover. It has worked fine since these modifications. I hope this helps. Attached Images Last edited by lakeroadster; 08-06-2010 at 06:48 PM.