Wow. That's news to me.....would you trust stock 50-year-old valves in a 409/340 with a stock cam/stock valvesprings? Not gonna rev it hard. Sorry to hi-jack.....
Michael post some pics of both your 63's man I'd like to see em
Heat sensitive 409's! Is that why there are so few left?
- Thread starter Michael Cohen
- Start date
Wow. That's news to me.....would you trust stock 50-year-old valves in a 409/340 with a stock cam/stock valvesprings? Not gonna rev it hard. Sorry to hi-jack.....
Michael post some pics of both your 63's man I'd like to see em
I was wrong was not a valve stem so no piston damage. It was a stem under the intake manifold. One was bent one looked like a question mark.
yup! push rod
CDNpontiac409guy
Banned
So, what was this "circular piece" ( read... valve spring retainer ) ?
If that was in fact broken in half... you have problems.
BTW, Have you had any stock 2 X 4 barrel intakes in the past ?
A lot of 348-409 parts are overpriced, in my opinion, however, a new set of stainless one-piece valves are very affordable. I think about $160. Money well spent.
Yes valve spring retainer broke in half. Replaced it . What problems? A member named Dwight Schultz Canadian has 2 x 4 intake ve7dcs@shaw.ca
I have a stock aluminium single 4 barrel intake #'s 3814678 I bought it to replace stock cast manifold for a 64 409 motor but it did not line up. So I did not use it.
CDNpontiac409guy
Banned
If a valve spring retainer broke, then the valve fell in the cylinder. Not good. REALLY not good.
If it's an exhaust valve, then the cylinder wall itself, may help prevent it from falling all the way in... but VERY little chance that it didn't bend, damaging the d]seat.
Pushrod ?
My opinion, a by-product of the retainer castastrophe.
Yes, Dwight !... good customer, bought my pistons, cam and stuff.
I just thought thast you may have had a couple 2X4 intakes in the past
If it's an exhaust valve, then the cylinder wall itself, may help prevent it from falling all the way in... but VERY little chance that it didn't bend, damaging the d]seat.
Pushrod ?
My opinion, a by-product of the retainer castastrophe.
Yes, Dwight !... good customer, bought my pistons, cam and stuff.
I just thought thast you may have had a couple 2X4 intakes in the past
Bill, See if you can get a pic posted of the broken retainer. Apparently the valve keepers stayed locked in and the valve did not fall in for a smack down.:eek Leo
I think you are right. The half that was left stayed in place. t The other half fell amazingly right next too the valve spring where it broke! The valve appears to not have fallen. I was so distraught I did not take a pic of the broken retainer.
Michael, GO BUY A LOTTO TICKET!!!! You will only need to buy one. Leo
I was reading an article (of course after the fact) It said 20% rods and stems are faulty. But not that many fail in applications right away. Maybe I was lucky it happened now than later when I was using the engine not just "breaking" it in. Excuse the pun.How the hell does that happen??Cool 63 tho looks good
The mechanic who built this engine is at least sticking by his work and making the repairs. I did pay alot for the rebuild but now it seems to be paying off.
In todays business community you can not always says that.poison ivy
Well Known Member
is that a stock pushrod? 348 or 409? what diameter