516 heads will work fine if you pocket port them
915 better
aluminum better yet-- watch your chamber size for compression changes
what gear do you have now?, which car? converter?
Dual plane good choice
which pistons, what's your compression?
fratzog suggested lunati good choice as are Howards and Hughes - no comment on specific cam until we know your compression and exhaust
Best might be Mike Jones Motorhome grind
Comp has nothing in the degree range you are looking for
Mopar 3 b nails it
where do you plan on driving, city, highway, mountains, towing etc
post 5
And the 383 270 hp 2 barrel and 383 330hp commando shared the same camshaft.
difference was the 4 bbl carb I do not remember if compression was changed
rumble writes
Why do you want a wide 114 LSA?
LSA is a result not an input (or it should be)
IMO, copy the Road Runner engine and use that cam. It works well with 3.55’s.
RR may be too much compression
answer RR cam in heavy C body would need early RR compression and 3.55
regular or premium fuel OP?
600 – 750 carb AVS or Thermoquad
Rumble- he is not going to be adding much compression over his closed chamber 516s
OP are you up to self pocket porting your heads?
Installing 440 size exhaust is SOP see from Stan Weiss site below
#7 you do NOT want to go to 906 heads- you drop compression and still do not have unleaded seats
are you pinging now? On what gas? No benefit with open chamber heads- a step backwards
$1100 no way
RR cam- what's your compression
no matter what it will loose low end – not for a heavy vehicle- requires looser converter than what you have- way obsolete design
\What IS you compression ratio?
Do you have a stock 4 bbl dual plane- that manifold was designed for exactly what you are trying to do and other early aluminum copies save weight-- there are several tests online you can review
that carb could be close to perfect but a vacuum gauge on the motor and see what your vacuum is at higher rpm may need a 750
#8 you should know exactly where the piston sits in cylinder so the math can be done. IMO, is look for at least 1pt. Compression increase or not higher at all. (AL will need about half or 1 point increase just to make up for the heat loss of the al head
More the merry IMO though it is not always needed. Exactly you need to know where you are
#9 YES you see the answers- believe
I OD hone the valve stems and re-doo the guides and then touch up the valve job (and blend the bowls)
Agree with Condor
effect of larger ex valve on 516 heads
------------port size valves--------100-----200----300-----400------500
516 Iron 182/6 2.08/1.60 N/A--62/46 126/97-199/133-210/138-219/139
516 Iron same 2.08/
1.74--------------122/102 172/135-201-151-216/151
Condor may not know you already have closed chamber 516 heads in your 66
you can compare head flows on the stan weiss website scroll down to Chrysler
but his advise is spot on
http://users.erols.com/srweiss/tablehdc.htm#Chrysler_Big_Block
13&14 are getting ahead of the game with cam selection
Crane or comp not in the running for MOPAR cams