Does this engine have points or an electronic ignition? Does the manifold heads have a damper / butterfly built in to them? Looked up the y pipe needed for this el camino engine and came up with this Walker Exhaust 40270 Y-Pipe - Price: $101.47 at amazon. Can anyone help out with answers to these questions? Thanks. (http://shoppers-cloud.com/?obid=1661208201)



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HEI was standard GM stuff from 1975 onward....they had it in 1971 or so, but it was optional.
The butterfly that you refer to is probably known as a Heat Riser. And yes, your car most likely had one. They were put there to help warm up the carburetor. The way they function is strange to read...but the butterfly would close when the engine was Cold. This would force exhaust gases back up the engine into a port built into the heads and through that into a Heat Crossover passage under the carburetor. These warm gases helped keep your fuel atomized and from dropping out of suspension and forming puddles in your intake manifold runners. When the engine got Warm, the butterfly (with the thermostat spring on the side) would open and allow all the gasses to now flow out the pipe to the rear of the vehicle. The problem with them was usually they stuck closed because they are in a place that gets tons of water and crud on them. Plus nobody this side of Mars, ever lubed the butterfly to keep it from rusting. So they stuck closed and your engine ran terrible when warm....and overheated a bit....and etc.
Craig ( another horse beat to death.....bring on the next pony)

Nah, Craig, the horse is still breathing. The crossover/butterfly messalso had a wonderful feature of cooking engine oil into coal on the bottom of the intake manifold. If you ever remove a factory manifold and re-use it on a fresh engine, be sure to pull the rivets out that hold the BBQ pan on the bottom of the manifold. There is no other way to remove the primordial ooze that is in there and you don't want fresh oil flushing out the sludge. You may notice that all the new generation GM heads no longer have the beloved exhaust crossover.

Now we can bury that useless horse!

http://i110.photobucket.com/albums/n114/kern-o/beathorse.gif

:poke:Sorry we dont do that here Only put engines in El Caminos Not Olds :poke::texas:

I just ignorant girlfriend of the guy doing this. I am the internet wiz who is trying to figure out the information on parts and other such for the boyfriend. he knows nothing about internet. I thank you for the help and answers. You still wont be happy as the motor is not going into an el camino but a buick. Thanks for helping anyway. If he has more questions I can't find answers for I'll be back.
Beth

Beth, if he has never done a swap like this and he dosen`t have any professional help he may want to pass on this, it can be done but when you go from Buick to Chevy, evrything is different, wiring, exhaust, cooling, ect,,, the Y pipe may fit but if you try to make it fit and then you want to return it you`ll be out of luck,, it can be done but you will need a bunch of tools, and a welder will help,, matty man

a couple of other issues to consider. The transmission bolt pattern is different between the Olds and the Chevy. Some of the bolts will work and a couple will not. I have seen swaps done where they've left out some bolts and it has worked. The 305 is a pretty anemic engine in the Camino. The added weight of the 98 will make it a slug. The accessory brackets for mounting the A/C, power steering and alternator are completely different.

If you are not experienced at engine swaps this is not one you want to take on. You'll be time and money ahead to find an Olds engine for the Olds.