406 sbc heads

[Fordtechman]

So undecided on heads. AFR 195 or 210?
Motor is a Dart SHP 4.165 bore, 3.75 stroke running JE pistons 28 cc dish and 6.0 rods.
Compression ratio will be 9.1 with 65 cc heads
Also running a weiand 177 blower with 7 inch lower and 3.25 upper pulley pushing 8 lbs of boost.
1968 camaro, 3400 lbs, 325/50 R 15 drag radials, 700R4 tranny, 3.55 rear gears
Howards cam 180345-10 hydraulic roller. Adv duration 300/306. Int .565 exh .580 with 1.5 rockers
Carb is a BLP custom flowing .. 935cfm
Some track, some street. What's the big difference in using the 195 or 210?
Is my cam too big? Am I loosing power going too big?
Last motor similar set up with generic 210 heads with bad flow numbers ran 11.58 in the 1/4 no problem.
I know it's not ideal for the track only turning 5600rpm at the strip but first and second shift at 6400 rpm.

[jason snyder]

go with the 210s ! no question ! the blower would even like the 220 , 235 heads !! the cam is not too big ....

[F-BIRD'88]

Either port version is going to work very well.
The 210 certainly won't slow it down any.

Order the larger 75cc chamber. Lower cr allows
More boost and timing on pump gas. (Step up to a 2:33:1drive ratio.)
I'd call and order direct and get the right compatable
Spring package.

The 1/4 MPH tells you how much power you made.
What was it?

Whether the cam is best depends on how else you
Use this car. When it eats that trans, (and it will) replace with a th350.

If you are going to rev it up that high you'd be better off
With a solid street roller setup. More power too.

Getting these details right makes more difference than
the difference in the port volume choice.

Getting the torque converter right is critical to getting
A hard launch and good ET. Many of the th700 converters are real lame.

[JoePorting]

As mentioned above, there's not much difference between the two flow or performance wise. The big difference is setup wise. The #1040 195 head is setup for flat tappet cams, so this would be a good choice for your hydraulic roller. The 210 is setup for mechanical rollers with 210 seat pressure, so you'd have to change the springs if you bought this setup. Although if you ordered from AFR directly, they can setup any head anyway you want.

[lefty o]

with a small supercharger on a 406, i'd probably opt for the race ready 227 AFR head.

[Fordtechman]

The 700R4 has a 2600 stall special 12 inch to 10 inch converter which retains the 12 inch lock up, it works great. Originally built by Bowtie Overdrives in California , they do a great job! I had gone thru it last year when the 3-4 clutch pack started to slip after ten years of abuse, not bad.
The 1/4 mile speed was 115 MPH with 1.58 sixty foot times at sea level track just on a easy test runs. I drive to and from the track, no trailer queen here. The car doesn't have a roll bar so I'm limited to 11.49 at the track anyway, but I can always throttle stop it. I'd rather have too much power and slow down that no enough and over rev it.
I already have hydraulic roller lifters and since I'm only 6500 rpms I thought I wasn't losing any power. Adjusted 3/4 turn after zero lash.
Either way I need AFR to build the set up, I use 7/16 roller rockers , both the 195 and 210 heads are so close in price I could go either way. My old generic heads were 210 but had junk flow numbers. The 195 would out flow them by far, but what would the lower runner do?

[F-BIRD'88]

I run that fast (115.10) without the supercharger.
All street trim. Very simple 9.8 406 w/vortecs. #3530
Th700 - to th350 swap picked up 4 th's and 1 MPH.
Half the cost.
Some areas to look at.
That supercharged car is almost 1 second off it's mark.
Either AFR head will get it done.
You are fussing over nothing, compared
To other critical areas.
EG:
With that cam you want to launch @ 4000 rpm.

[Keith Morganstein]

If your down to those two AFR heads, Buy the AFR210cc race ready version. It's the best deal. My experience is with AFR on a SBC, you go to the larger size if debating. I have SBC's as small as 355 cu/in running very well with the AFR 210 race ready head.

[Prostreetbike]

The cam looks a little long on duration for your RPM range and the 110 L/C may hurt you because of the small displacement blower. With the small blowers you do not want to waste boost so a 114 L/C would be beneficial. Your cam would probably be a better match If you had an 8:71 blower and lower compression. Both the 195cc and 210cc AFR heads are a little small on CSA for a blown 400 from all of the advice I have gotten on the one I am building. The 195's are 1.98 and the 210's are 2.09. If you go with AFR's on a blown 400 you may want to step up to the 220's at 2.43 CSA. The 227's would need the expensive shaft rocker setup so they may not be worth the extra cost. I was leaning towards some Profiler 210's with a 2.3 CSA because the Profilers have room to grow if needed and seem to be a great deal for the price. You could buy them bare and get good quaility valves installed with the springs you need. Good Luck with your build !

[rugmuffin]

4.165 bore x 3.75 stroke=408.7 cu.in. 406 is a 4.155 bore x 3.75 stroke.

Call it a 4-0-9