FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: fairlaniac on November 13, 2013, 09:05:20 AM
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I picked up a pair of Edelbrock bare heads 60059. I am building a 427 stroker. 4.25 stroke and my finish bore is 4.260. I need some assistance with what I should do with the heads. I want the engine to run decent on the street and the occasional day at the strip. It will go in my ’66 Fairlane currently weighing 3440 w/o me. I will be using a Dove 8V Tunnel Wedge intake. I have Comp mechanical roller cam I plan to use. It’s a .695 lift, gross lift duration @ .020 I-287, E-295. Installed @ 104 Intake CL duration @ .050 I-256, E-264, lobe separation 108. I assume 2.19/1.75 valves? What kind of springs, pressures would you use? My plan is to possibly send these to Survival for some work. What work would be recommended? It is a stick car.
If you have any other question for me, just ask.
Thanks,
Doug
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Port the poop out of them. Change out the helicoils in the heads, install Timeserts or equivilent. Run about 225-250 seat and about 600-625 open.
I would use an 11/32" valve, as light as your wallet will allow, not saying you need to go titanium, but maybe a hollow stem Ferrea. Springs will depend on the install height with your valves, but I would use a PAC, PSI, Manley, etc. spring.
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You will gain a bunch of flow with a 45* intake seat.
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If your installed height is around 1.9", the Comp 943 spring should work and if the installed height is around 2.0", the Comp 955 or 26089 should work. I think PAC used to make the 943 and 955 springs for Comp before so you can also get them from PAC. I think Trick Flow carries these springs too. These will all give around 230-240lbs on the seat and around 600lbs or so open at .700" lift. I don't think I would go too crazy with spring pressure if you plan to drive it a lot on the street.
Brent's advice about going to solid inserts for the rocker stand studs is probably a good idea just to play it safe. If you don't have the rockers yet, the race T+D set is the way to go as long as you have open oil passages to the lifters.
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I like those 955 springs, they're still made by PAC.
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We have a CNC port program for those that gets you in the 325-330 cfm range while still keeping them within porting range on that intake dimensionally. On the Dove intake you sometimes need to fill in the "dents" above each port with weld before opening them up. The 482 inch engines we've dyno'd with that port program and a similar cam dyno at somewhere between 610 and 640 horsepower at +-/11:1 compression and on what intake package is used. Valves are normally 2.200 and 1.710 with 11/32 stems - you can get a little more by running a 2.250 intake if desired. The springs we use most often are Manley 2241443 (that number is by memory so don't run out & order them...), which give +/-230 seat and 610 open when set up at 1.960.
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After 20 years and 40,00 miles, I just finished having my 428CJ stroked out to 462. I also have the Edlebrock heads that I had ported with 11/32 valves, beehive springs, Titanium locators and keepers. The compression is 11 to 1 compresion. I have the Dove Tunnel Wedge with 2 4224 Holleys. It made 564 Ft lbs torque and 584.9 HP on the engine dyno. However, I had to change the carbs out for some with vacuum secondaries so I could drive it on the street. The 4224 Holleys would not run under 2000 RPM without bucking. FYI, it ran almost $3K for the head work not including Rockers. It is in a Kit Cobra with a tremec 5 speed. It is a blast to drive.