Do heads worsen emissions??
Re: Do heads worsen emissions?? Difficult to say, really; depending on how emissions are measured.
For instance, it could be that with even the best ported heads, there may be some loss of port velocity at low speeds, which would result in a poor(er) cylinder fill (at idle), which would in turn result in a rich mixture.
Or, I could be completely wrong; just something to consider, is all.
For instance, it could be that with even the best ported heads, there may be some loss of port velocity at low speeds, which would result in a poor(er) cylinder fill (at idle), which would in turn result in a rich mixture.
Or, I could be completely wrong; just something to consider, is all.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
TECH Addict
Joined: Dec 2001
Posts: 2,298
Likes: 2
From: new england
Re: Do heads worsen emissions?? If heads raise compression than NoX emissions can be higher, good tuning that is usually needed for heads cam should keep motor somewhat clean. Biggest problem is loss of cats or rear placement of aftermarket cats, they dont light off as well further back from motor. They are what cleanse the exhaust of most of the pollutants. 
