[cobalt327]

Advertised 400 hp but made 446 hp.

[BuzzLOL]

.. If I was actually putting that crate engine in a heavy duty truck, would step back from the XE268 cam to more like the XE262 or XE 256 to flatten/broaden the torque curve and start it at a lower RPM... or maybe even a Summit 214/224 cam to get less radical cam lobes that would last 250,000 miles...

[techinspector1]

Originally Posted by BuzzLOL

.. If I was actually putting that crate engine in a heavy duty truck, would step back from the XE268 cam to more like the XE262 or XE 256 to flatten/broaden the torque curve and start it at a lower RPM... or maybe even a Summit 214/224 cam to get less radical cam lobes that would last 250,000 miles...

DING, DING, DING, we have a winner. Someone who actually might hate extreme grinds as much as I do.

[yankee phil]

Originally Posted by cobalt327

ID Chevy engines

I don't see that block c/n, but there are two similar:

• 14015445: 1975-'90; 454; car and truck
• 14015543: 1987-'90; 454; 4-bolt; Gen-5

The heads are rectangle port w/325 cc intake port volume, decent heads when matched up to the rest of the engine. They were a replacement/crate engine head.

What are the casting numbers of the crate engines rectangular port heads,I've heard of these before but have never seen a pair for myself. Over here there are more crate engines than old stock in the junk yards,would be useful to know the better head numbers.

[yankee phil]

Originally Posted by cobalt327

ID Chevy engines

I don't see that block c/n, but there are two similar:

• 14015445: 1975-'90; 454; car and truck
• 14015543: 1987-'90; 454; 4-bolt; Gen-5

The heads are rectangle port w/325 cc intake port volume, decent heads when matched up to the rest of the engine. They were a replacement/crate engine head.

Can you tell me the number of the castings on those crate motor rectagular port heads . There are more crate motored trucks here in the junkyards than original equipped ones so it'd be handy to be able to pick out the hidden treasures. I've heard of these crate motor heads but have yet to see a pair,kind if a myth over here I'd like to see proven true.

[454C10]

this post is getting a little old. almost 4 years now.

[yankee phil]

Originally Posted by 454C10

this post is getting a little old. almost 4 years now.

Hey ,your still reading it,maybe cobalt will read it and answer the question,even if its not relevant to you now that your engine is built or blown up, the rest of us might find the information helpful , interesting,and its a way to get in touch with someone that has experience with what's being discussed,probably the main purpose behind keeping these threads on line.

[1971BB427]

It's a post from 2009, but the additional info is very interesting, and will benefit those with similar engines today. I'm building a '83 454 from a truck, and swapping the factory peanut heads to Edelbrock oval port aluminum heads. Best upgrade you can make to a smog motor 454 with peanut heads is a good pair of heads and the right cam. The smaller combustion chambers and better flow will increase compression, and develope more HP and torque.

[Dean Pearson]

[QUOTE=yankee phil;1674482]Can you tell me the number of the castings on those crate motor rectagular port heads . There are more crate motored trucks here in the junkyards than original equipped ones so it'd be handy to be able to pick out the hidden treasures. I've heard of these crate motor heads but have yet to see a pair,kind if a myth over here I'd like to see proven true.[/QUOTE )

The number on mine is, 6272990
There is also a M-7-3 and in another spot GM1T, Also says HI PERF.
All under the valve cover and really easy to see.

Dean.