View Full Version : Header suggestions for 454

07-10-2010, 09:30 AM
Anybody got any suggestions for headers for a 454? Not for me, but a buddy of mine has a pair of 1996 454's (not sure of the Gen #) that someone is trying to sell him a set of old style CMI's. from what I have read in the mags, they say avoid the old style CMI's because of reversion problems. They say the E-tops are a much better design. What do you guys think? thanx in advance for any help,


07-10-2010, 04:35 PM
For fraction of the cost he can get Stainless Marine Manifolds and Tail pipes that will last 10+ yrs. If they are plain ol 454's he's not going to gain anything with a true header over a SM Manifold, headers only out shine SM Manifolds when you get up over 540ci.

07-10-2010, 08:48 PM
IMO headers on an unmodified engine are not much more than bling and do little to nothing for performance.

07-11-2010, 08:06 AM
Here is the real the new and old are ok, it is just befor merc bough CMI. they did a cost down. Noe here is the e scoop, CMI the best Stainless Marine next---However On most engines Sm would be my choice.

07-12-2010, 08:29 AM
MOP is correct. If you don't have an engine that requires them then a set of EMI or SM perf manifolds will usually work nicely & save you some coin.. :)

07-12-2010, 08:42 AM
Many thanx guys! The motors are not modified, just bone stock 454's. I'll tell him to save his money and buy a Donzi next time.