Originally Posted by LJM97Z
Have to disagree with its hard to over cam a 400, you can over cam ANY engine, I over cammed my 406 & it had iron eagle heads & 10.4.1 compression, It was a bear to tune, sure it would rev too the moon, but it ETs & MPHs exactly the same with the mild cam that i had originally put in it & i shift it at 5000, not 62-6300, So if you choose a cam, choose wisely, I'd just keep it on the cheap, you could re-ring it, clean up the heads, all new gaskets/chain/oil pump, mild cam, then just install headers/intake/carb, It'll run very strong, even with the stock heads. This was the cam that i installed that hurt my 406.
510/510, 245/245 @50, 108 LSA, installed at 104*, even tried 102*
I have 4.11 gears & a 4200 stall.
You probabily found it "Hard to tune" because of incorect timing curve for the cam. This cam likes a locked out timing curve 36deg at idle.
Thats right , it needs full timing at idle to idle nice and clean.
And a 4.5" power valve. Without these two set up mods it will
idle like crap and have crappy throttle response. and tend to load up the plugs.
Once these set up mods are done it will be a whole different beast
especially with a 4200 stall and 4.11's.
Its a matter of set up. This is a very good street machine/ bracket cam for a 400sbc.
good power from 3500 to 6000+
The cam I run in my 406 is very very similar to this (it has the same exhaust cam lobe)
runs 11's, run fine on the street. idles rock steady at 900rpm, 750 in gear. can't be that bad.
set up makes or breaks the deal.
the 180cc Iron eagle heads suck. Is that what you had?
Very modest port flow out of the box for a 180cc head.
The 200cc and larger heads are the platinum series and a much better cylinder head.
The 180 is not a Platinum series head.
qjet to performer rpm carb adapter:
if you modify the proform 4 hole adapter like in the picture so its a split plenum design
it will allow the Q jet to work pretty good on a square bore manifold like the RPM.
Modify and blend the Qjet flange shape into the Square bore flange shape But keep the
plenum split intact.