Eldomiwok

129 398704yrh*d8y Gmy 411961 *?di 125

66luvr

Checking account number?

frankr442

Give us a clue. Where do they come from?

Bluevista

It's either an ICBM launch code or the cheat code for a 70's Pong video game.

Eddie Hansen

those are the exhaust manifold numbers
'66 4 398704 RH; 330. Standard issue manifold.
'68 - '73 5 398704 RH; X-over. 350. Delta 88.
?? 1 411961 LH; No X-over. Straight down. 307, 350 gas, 350 diesel.


seems they are for a 68-73 350 in a full size car? this is just a guess 1 is the right hand side one is the left hand side, the date code and plant probably make up the balance of the numbers.

Eddie Hansen

BTW don't take the guys ribbing the wrong way, they may not have read your other post, and they are not mind readers, the best way to get info would be state the part you found the number, and if possible a picture, they are a great bunch of guys, but there are thousands of posts to read, and to get the best answer you need to give the best info.... hang in there bud, you will get a set of manifolds for your 455, but these are not them... they are for a small block car, while they will bolt up, they will do more harm then good.. get the manifolds I mentioned or go with headers...

Eldomiwok

Ya u guys have been way helpful tryin to figure what's interchangeable on 350. That's still n car.I have iPad an iPhone trying to post pics thanks again

Eddie Hansen

eldo, ok just a few basics that will save you some time.


generally speaking you can use everything ( accessories) from the 350 on the 455 except the intake manifolds and exhaust manifolds, you will need to look at the water pump to make sure it is the same thickness so the pulleys etc line up. even the oil pan will be the same.

Eldomiwok

?starter ? Radiator nor cal gold country don't get hotter than 110 here

Eddie Hansen

yes, most probably the rad will work if it is in good shape etc yes the flywheel, starter, tranny, torque converter, will all work. bear in mind the 455 will have lots more torque, so if it is a turbo 350 tranny it may not last if your beating on it.

Eldomiwok

Ya I'm anticipating my original trans to go out an build it strong. Don't want to move cross member e brake or linkage. Thanks for the info