Thread: blocking off egr

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Originally Posted by Dave Severson

Blocking off an EGR valve won't cause an engine knock. Two unrelated issues. Maybe pull the plug wires one at a time, see if the knock quits on a certain cylinder. Depending on what type of knock it is, could be anything from detonation to a loose wrist pin or a broken piston. EGR is Exhaust Gas Recriculation and is designed to pump some of the exhaust gasses back through the engine to finish burning the gasses not burned the first time through the combustion process. IMO non of the smogger heads belong on a performance type engine. Lots of good heads on the market that don't have the emissions garbage built into them......

What is it specifically that classifies a particular head as emissions compliant or "smog" heads?

Might as well figure that any cylinder head made for passenger cars and trucks after 1974 is a smogger head. If you want good heads for performance forget the stock stuff and get the aftermarket aluminum or cast iron heads. The last few years the factories have finally put some performance back into their engines, the small V-8's are fairly good the way they're made. Now add a blower and upgrade the electronics and it's easy to get in the 400+ horsepower range with nothing but bolt ons and plug ins....

Picked up a set of Mr. Gasket ultra-seal intake gaskets today. I noticed that the gaskets are solid where the smaller center ports are located. Only have the bolts holes there. Will these work?

The packaging states for 1987-1995 Gen I SBC.

Application heads:

14101083...1987-up...350..........Gen.I, also used on crate motors, 285 or 300 hp, 64cc chambers, 72' center manifold bolt angles. (Mortec.com)