Ok, so I just ordered some AFR 205cc heads for my motor. 426W
Now I have to wait 2 weeks to get them in...

I was looking into possibly changing cams while the motor is torn apart. I currently run a small base circle Crane cam with a Crane retro fit kit. Hydraulic roller of course.
The specs on this cam are as follows.

230 and 238 duration @050.
Lift is 575, 595.

I have shopped around a bit online and have not really found any cams that are bigger in lift, just added duration. This cam was chosen by my engine builder. And it is real similar to one the Trick Flow sells. But my new heads allow for a bigger cam if I want to and my pistons are fly cut already...

So what affect does the higher duration really have in how the motor responds?
Is a longer duration cam better for higher revving engines, or suited more for a low end stroker like my motor?

Also, my engine was roughly 10.5:1 compression ratio with Twisted Wedge heads that were 61cc I believe. Is there a way to calculate the compression ratio with a 58cc head now?

Also, I ordered some bolts from GT350Clone and they are great. Check them out on his webpage.

 

whats the bore and stroke on the 426? ill come up with a C/R for you

 

Well, the bore 4.030 but I am not positive of the stroke so I guess I can't help you there. It is an offset 400M crank if that helps any.

 

I came up with 0.32 points difference in C/R

Bore= 4.032
Stroke= 4.190

DesktopDyno also came up with 500hp and 550 ftlbs with Comp Cam #35-349-8FW (not sure if thats even a Ford cam) and AFR 210's

 

Thanks for the info, I was figuring I should be in the 500hp range with this setup.

 

here's some good cam tech you may find interesting:

http://www.wighat.com/fcr3/camtruth.htm

 

if you shoot me some cam part numbers I can enter them into desktop dyno and check out power numbers

that cam that I ran through the computer was a Comp Xtreme Energy Camshaft, Hydraulic Roller Tappet, Advertised Duration 264/270, Lift .512/.512, Ford Small Block

 

I will get the info tonight when I get home. The Cam sheet doesn't show the lobe seperation, but it has everything else on there. I would love to see the desktop dyno results on that one.

My cam has more duration and lift. I think the advertised duration is 298/302 or something close to that with 575 /595 lift.

I will get you the info tomorrow. Thanks

 

LiveWire,

OK, here are all of my specs that I think you need to do this.

426W
Bore= 4.032
Stroke= 4.190
CR = 10.55:1 could be a little higher with the 58cc heads, but thats ok.
AFR 205cc heads

Cam Small base circle Crane hydraulic roller. Part # 44hr00027
Grind # HR-230-359-2s-12-rf
Lift is 574 intake, 595 exhaust.
rocker arm 1.60
advertised duration is 294 / 302
duration @ 050 is 230 /238

If I left anything out, let me know, I have my cam sheet with me today.
And thanks for the info!

 

oh yeah,

I run a single plane Super Victor Jr manifold,
750cfm holley mechanical secondaries.
MSD distributer
Jacobs pro street ignition.
1 3/4" headers.

That should do it!

Thanks again

 

Grind # HR-230/359-2s-12 comes up as a Chevy cam on Crane's website...

 

 

Adv. Duration 305/305 with valve lift .574/.595

I can't put in your cam without knowing valve closing timing. Maybe you can find your cam online and link it to me?