Project "Blown HD" my 6/8 drop/shortblock/heads/cam/blower/tranny install
10-13-2007, 03:32 AM
#2021
TECH Enthusiast
I think that's for engines with the old fashioned flat tappet cams. They need a break-in period of about 20 minutes at around 2500 rpm. A prolonged steady heat blast like that might damage brand new ceramic headers. Fortunately our engines use roller cams, which require no break-in.
10-13-2007, 07:14 AM
#2022
TECH Veteran
Well Grippy, I just started up my Camaro Thursday night for the first time in over 2 years with the newly rebuilt engine. I was so excited I danced a jig. 
I can understand your current anticipation.
I can understand your current anticipation.
10-13-2007, 09:24 AM
#2024
WARNING! Breaking in an engine with ceramic-coated headers WILL result in damage to the coating and will VOID all warranties. Ceramic-coated headers require several heat cycles to fully cure before they will withstand extreme heat. HOOKER recommends using a cast-iron exhaust manifold or an old header to break in new engines to avoid coating damage.
http://www.holley.com/data/Products/.../199R10352.pdf
Anyone know if this is true?
10-13-2007, 11:05 AM
#2026
ok, so maybe there is going to be a little bit............there were a few bolts I could not source @ ARP and in some cases could not source in SS so I went ahead and sent a few pieces out for chrome, will tie everything together nicely IMO:
10-13-2007, 04:21 PM
#2027
TECH Veteran
I've ran accross that coating issue before. The older engines with a flat tappet cam have to be run in to break in the cam. That involves around 2000rpm with the vehicle in neutral or park. This creates alot of heat usually due to a lean condition as well as no air getting past the headers. If you plan to run the engine for very long when it's fresh like that, I've found that the only way to not discolor headers is to place fans blowing down at the headers. When I run in any fresh engine with headers I always put a fan or two in front of the radiator and one blowing in on each header. This not only keeps the coating cooler, but keeps the headers from melting wires or anything near them. It also keeps the e-fans from having to work very hard to cool the engine. I try to not have to run the fans any more than I have to during a run in.
10-13-2007, 06:48 PM
#2030
Controlling F-18's... whatchu mean? In a round about very general way how do you go about doing that not on a carrier? I tell ya what... I've had the pleasure of working with a couple of former Nukes... one submariner and one carrier... who is now a GENIII/IV tuner 
... classy guys the Navy puts out for us
Bill
