mod list running out of ideas
lid
filter
ported MAF sensor
smooth bellow
ported throttle body
throttle body bypass
MSD wires
NGK plugs
synthetic motor oil
160 degree thermostat
long tube headers
good Y pype
stall converter
under drive pulleys
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1970 GTO orbit orange Judge 400cid
1969 GTO black 400cid
1971 GTO blue 400cid
1970 GTO convertible red 400cid
I'd look into getting a custom made 400cid just to stay consistent.
lid
filter
ported MAF sensor
smooth bellow
ported throttle body
throttle body bypass
MSD wires
NGK plugs
synthetic motor oil
160 degree thermostat
long tube headers
good Y pype
stall converter
under drive pulleys
I just did these the exact same mods except for the stall, I have an M6.
Deffintly get a dyno tune, I took mine to get dyno'd and my A/F Ratio was way off. It was between 17-18 and should be around 12.8 range.
My first run was 306hp/315tq! Bad, very bad, we did another run, same thing, then Mike tricked the MAF with some type of tuner and the car put out 350hp/355tq on the last run!
I am going back down today so he can do a full dyno tune. At first, I was trying to get away w/o having to do this, but after all this work, that 50hp diffrence is what it is all for. I know each car is different but the tune is a must do with the combo of all these mods. I had descreened my MAF and I think this was the possible culprit of my A/F messup, and if you ported yours, you may experience the same problem.






i have a 406 in my basement im currently rebuilding =-)