After looking at the engine codes you have listed I could not find the applacation for my engine block numbers. It is a YE 348706 The heads are 143. I did find some posts and info on the heads but not the block ID. This is not the motor or heads that came with the car. How well do these match up for a decent daily driver? I had them rebuilt several years ago and have very few miles on it so far. Put a elderbrock 4brl carb and intake on it. Cam is a Speed Pro Sealed Power CS 1022R. Any and all info would be nice. Also put a turbo 400 tranny in. 355 posi with Hotchkis multileaf rear springs. In paint shop now and interior will be done as soon as I get it back. Will be nice to get it back on the road after many years of slow going. (1967 Firebird coupe)
Plug the engine code YE into classicalpontiac.com's engine code database and you'll see that it is a 1967, 325 horse, 10.5:1 compression 400, with an automatic transmission and a 4bbl carb. It's not a Firebird engine but it's not a bad one to build.
Date code, casting # as well as block code will tell you what you have. Pontiac had a thing about using the same block code in different years. The Y code is for auto trans, W code for manual.
This got me thinking. I have a 68 bird with a 69 400 engine. Its a YD code, which I looked up to find its a 290 HP with its original #46 heads. I was told the original block cracked and this one was swapped in, but the original 1968 #16 heads were reused. I am assuming that changes the HP rating, a block is a block right? If the bore and stroke are the same, its the heads that change the HP? That and its got a 4bbl on it, and hooked up to the original 4sp. Poor frankinstieny car O'mine. Block used to be a WQ. Any guesstimates on where that horse power might be after a block change but retaining the heads?
Not trying to steal your post flipbird...you just brought up a good point, and raised my own questions.
This got me thinking. I have a 68 bird with a 69 400 engine. Its a YD code, which I looked up to find its a 290 HP with its original #46 heads. I was told the original block cracked and this one was swapped in, but the original 1968 #16 heads were reused. I am assuming that changes the HP rating, a block is a block right? If the bore and stroke are the same, its the heads that change the HP?
You're right. The block and rotating assembly are not what matters in your case. It's the heads, cam, intake, and carb.
This got me thinking. I have a 68 bird with a 69 400 engine. Its a YD code, which I looked up to find its a 290 HP with its original #46 heads. I was told the original block cracked and this one was swapped in, but the original 1968 #16 heads were reused. I am assuming that changes the HP rating, a block is a block right? If the bore and stroke are the same, its the heads that change the HP?
You're right. The block and rotating assembly are not what matters in your case. It's the heads, cam, intake, and carb.
Depending on the year of the block, the cranks did get thinner counter weights. That happened in the mid '70's. Top ends can be put on most anything.
