Thread: EGR Valve Question

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What was the first year for 454 engines to have EGR valves?

What general model is this engine? (can't locate the block number)

The numbers should be on the block, a pad just behind the alternator.

I'm pretty sure that the first EGR valves hit in the 1973 model year for all OEM's. That was the year of the big CAFE (corporate average fuel economy) rule changes, and they threw everything & the kitchen sink at the engines that year, including EGR.

front pad is were the block was made if it was auto trans or stick .the year of block on most all blocks its up on the back of the block by the bell housing on a 72 block it.s there

A big block doesn't have id numbers on the rt front pad like all the sbc's do????

Originally Posted by pat mccarthy

front pad is were the block was made if it was auto trans or stick .the year of block on most all blocks its up on the back of the block by the bell housing on a 72 block it.s there

Then there is no way I will ever see that - short of pulling the engine, because it is tight in that area!

I was told it was a 72 but it could be a 73 or later?

Ivan,
My first recollection of the EGR was on 1973's, but I did see a reference that GM may have used them in '72 so your information could be right - EGR Valves

1970 Z/28 had EGR on the 350 engine

California started that garbage sometime in the 60's

Come to think of it, my 69 Z/28 had it as well as the 70 Z/28. Check valves
would go bad and the exhaust would pop on deceleration. I ended up pressing
ball bearing balls in the lines.

On a BBC, there is an alphanumeric number machined on the pad in front of the passenger side cylinder head (move the alternator to see it) or above timing chain cover (use a mechanic's mirror and a strong flashlight). Also, there is a block casting number behind the driver's side head on the ledge adjacent to where the bellhousing bolts on. Again, use a mechanic's mirror and a strong flashlight.....
KD Tools , 2840 1-1/4 Inch Round Magnifying Mirror w/ Pocket Clip & Telescoping Handle
The number on the back of the block will identify the block casting and the alpha number on the front block deck or pad above the timing cover will tell you the original application of the motor.
http://www.nastyz28.com/chevy-engine-code-stampings.php

Originally Posted by rspears

I'm pretty sure that the first EGR valves hit in the 1973 model year for all OEM's. That was the year of the big CAFE (corporate average fuel economy) rule changes, and they threw everything & the kitchen sink at the engines that year, including EGR.

Sounds right. The very first emissions control devices (PCV) were installed on 1967 models

on marine engine they were still using the iron low pro with out EGR till mid 90s. on the intake you may see a cast year number on intake runner or by the dist pad . i had many of them iron intakes over the years never looked at them that long .engine could be 72 /73 up till 89 around there was the time GM went to the mark 5 . and you do not have one of them. any time over the life of the engine the intake could of been swaped out. who knows what been done to it looks like it now has a spacer plate on the intake with a square bore holley carb on it . so you have a 454 from 71 to 89 .i can tell by other things to how old it is .pop the valve cover off and get the head casting number if heads were not swaped around this will get you close to what you have but all 454 blocks are all about the same thru the years that i listed. i built many of them and some to 427 with the big damper

Many thanks to everyone