New heads flow 530/370cfm unported!
 

New Thor heads flow 530 and 370 cfm unported with 2.5" and 1.88" valves at .750" lift.

Cool Intake allows good access for fine tuning too.

More pics

Copper Beryllium seats, All bolt holes helicoiled and hardened shoulders for all head studs

One last look at two piece Intake manifold. MFG's recommendation is for a 1650 cfm dominator.

Looks good, what's the port size?

But they're for a Ford. :(


I read somewhere that the CNC version will blow 580 on the intake.

You are on to me :D It did not take you long:cool-smiley-011:

Yeah I read a CNC outfit in Michigan is getting 580, not sure what kind of lift but I suspect much higher than .750"

Not sure of the Port size/volume.

Would Love to run these but headers would be hard to get fabbed. I have the "peanut" A-heads which have been around for 20 years and those were hard to get headers for due to their size. They flow 455/335 at .800" (CNC'd) which will do for now

But can we make them fit a Chevy block?? :) :)

Bore spacing is 4.900" Head studs are 9/16ths Suppose it could be done....or you could move the dist. up front:D

Not sure if I missed something, but running a cam at .750" lift it seems like you're quickly getting out of the reliability range....no? Especially when everyone is looking for endurance/reliability in offshore performance apps. Until we know what the intake runner volumn is, then I guess it's kind of a moot point anyway.

Am I wrong??? Don't throw too many darts at me! :party-smiley-004:

Of course you are absolutely right.

I care more about .450", .550" and .650" lift and air speed. These heads are made for all out big inch racing, although I bet they would work on big inch, high rpm or big blower motors in front of #6 drives:cool-smiley-011:

I was trying to be funny and I am an overly proud Ford guy:D

Updated
 

Here is an update for any out their interested;

Dean, I know you were curious:cool-smiley-011:


PostPosted: Sun Feb 03, 2008 1:14 pm Post subject: Reply with quote
Okay Guys,

I have an UPDATE for you. These mildly ported Thor Gen II heads have an intake runner volume of 475 cc's. The exhaust runner volume is 234 cc's. The chamber volume is 67 cc.

With a 45* seat angle valve job,,, did I say 45* Seat Angles Question ,,, NOT 50* or 52* or 55*. Yes, 45* seat angles for long running continuous duty cycles, we have the following flow numbers.

Intakes; average of 4 ports.
.200=160.8, .300=240.3, .400=321.3, .500=399, .600=459.5, .700=495, .800=519, .900=530, 1.000=539.5 cfm.

Exhausts; average of 4 ports, WITHOUT a test pipe.
.200=125.3, .300=176.3, .400=233.3, .500=299.8, .600=335, .700=351.5, .800=361, .900=368.3, 1.000=372 cfm.

With a test pipe put on at 1.000" lift, the flow jumped from 372 to 405 cfm. Testing was done on a 4.625" bore @ 28" H2O. I was very pleased with the flow numbers and the next set, that's already here, will have the steep angle valve job. I'm expecting higher flow numbers above the .800" lift, but the trade off (as always) will be lower flow numbers in the mid range lift area. I'l post that data in a couple of months.

I hope you find this data interesting,
_________________
Charlie Evans