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Not much can be gained. The EGR valve remains closed at idle and at wot and only opens during part throttle operation. Look inside the TB, at the top see a couple of tiny holes not very far apart. These lead to the vacuum connections that control the EGR. Valve opens only when the butterfly is positioned between the two vacuum ports, for instance when you're rolling at a steady 25mph on the emissions dyno. When accelerating hard, the valve is closed. If you want to test yourself, disconnect and plug the vacuum line at the EGR so it won't open at all and see if you like it any better. To make the experiment valid however, first make sure you're EGR system is working properly. A vacuum gauge connected at the EGR valve should show zero at idle, jump to 10 or so under normal acceleration up to cruising speed and should snap back to zero if you floor it or lift. If not, there is a problem in any of several vacuum components. Second, a vacuum pump drawn on the valve itself should cause the engine to stumble while at idle speed. If not, the EGR tube is blocked or the valve is not operational. Its pretty common that the EGR system becomes plugged up with soote over the years so your EGR system may have already disabled itself thereby saving you the trouble. :wink:

Phil D.
 

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Have seen a small block chevy in a 1982 Supra before. Fitment issues required a dry sump system and modifications to the steering rack to clear the exhaust manifold which resulted in some handling issues that the owner couldn't use it for racing as he'd planned. As to whether or not its worth all the hassle, most on this forum will tell you its not. The particular one I've seen is sitting in a warehouse in Dallas where its not moved since it was converted in 1984. Owner is a friend of a friend of mine and considers it a failed experiment and moved on to other projects. He keeps it thinking he might use the engine and tranny for something else someday. Chassis has 17,000 miles on it but so much is hacked and the original driveline is long gone so it'll likely never see the street again. I offered to buy it for parts, sans driveline, but the owner seems to think the chassis is still worth something because of the low mileage. Oh well....

Phil D.
 
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