Cmi 496HO header mods
#1
Cmi 496HO header mods
I have two brand new sets of Cmi e-top headers. Which I am curious if they can be modified to work on my 496 HO's? I have never had the manifolds off of these engines, so I do not have any knowledge to the changes on the bolt pattern etc. I plan on pulling the engines this winter to detail the bilge, so that would be the perfect time to upgrade the exhaust.
#2
Gold Member
Gold Member
You will have to fabricate oil filter brackets and may have to fab an oil line.
Depending on the CMI's if they have the correct exhaust manifold temp sender you are good to go. If not, someone will have to weld them in too.
Depending on the CMI's if they have the correct exhaust manifold temp sender you are good to go. If not, someone will have to weld them in too.
#6
Registered
iTrader: (8)
The 496 8.1 and 454/502 base are the same exhaust bolt pattern. It's the stock 525 EFI heads with the different pattern. As to power gains, your looking at 20-25 propshaft HP gain. Roughly 1-2 mph IF propped right.
#7
Gold Member
Gold Member
#8
Registered
Platinum Member
Join Date: Jan 2006
Location: wisconsin
Posts: 688
Likes: 0
Received 0 Likes
on
0 Posts
when testing other exhaust on the dyno... I just used a paper clip that was cut & used as a jumper. the sensor in the header sends a signal to the computer when it over heats.. I don't know the exact temp, but it goes into guardian mode. What year/model # 496 do you have?