The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

*Billla* · 05-22-2007, 09:19 AM

EGR does just that - Exhaust Gas Recirculation. Unburned fuel is routed back into the manifold for combustion. Unless the engine is computer-controlled, there is no benefit to EGR, period.

In terms of manifolds, you won't start outbreathing the stock manifolds until you get up above ~325 HP on a 350. The stock cast-iron low-risers aren't bad at all - and you can always make a plate to block off the EGR and put a pipe plug in the manifold.

Most of the '70s 350 300 HP and 350 HP (Corvette) used a cast-iron low-rise intake - the '5577.

The Performer is your best bet from your collection.

05-22-2007, 09:19 AM	#5
Billla Account Suspended Join Date: Sep 2005 Location: Monroe, WA Posts: 3,814	Re: Stock Intake manifolds EGR does just that - Exhaust Gas Recirculation. Unburned fuel is routed back into the manifold for combustion. Unless the engine is computer-controlled, there is no benefit to EGR, period. In terms of manifolds, you won't start outbreathing the stock manifolds until you get up above ~325 HP on a 350. The stock cast-iron low-risers aren't bad at all - and you can always make a plate to block off the EGR and put a pipe plug in the manifold. Most of the '70s 350 300 HP and 350 HP (Corvette) used a cast-iron low-rise intake - the '5577. The Performer is your best bet from your collection.