I'd like for someone to run this through EA and see how it compares to my Desktop Dyno.

421 SB
Cola 3.875 crank
Eagle 6.0 H-beams
4.155 Wiseco forged 10cc domes
AFR 220 Race Ready heads 76cc
12.3-1 comp.
solid roller 253/261@.050 .638/.666 w1.6 rockers
Hurricane intake, port matched
780 DP Holley
1.75" pri. 3.5"collector through 3.5" x-pipe w/Hooker Aero Chambers dumped at axle


DD shows about 620hp@6500 572tq@4500-5000.

If there's anything I missed let me know. Thanks in advance!

That's not too far off except you'll need more intake and carb to get over the 600 mark IMO. The 750 / is choking it. My backup 434 went 666 on a conservative dyno with 13:1, AFR race ready 220's, Crower roller 264/272 .675 lift, Tunnelram and a pair of Proform 750's.

Just a word of advice, AFR claims the 220's will work with 'standard' sbc valve train components. That's a stretch but it 'will' work,,, getting geometry 'dead on' is two different things. Crower makes a nice .45/.10 shaft rocker system just for the 220's. If you choose not to go shaft rocker, let me know. I have a AFR stud girdle for the oddball 220 valve placement w/ tall 7/16" poly locks and rocker studs that's for sale. E-mail or PM me for info.

I would say the numbers are right. I'm with Marv, needs more carb. My desktop dyno showed 607hp@6500 and 552tq@5000. My dyno program's numbers are close, but the RPM is closer than the numbers.

Ok, thanks guys. I know the carb and possibly the intake is too small. I figure a 950-1000 carb is needed and when I get a new one I'll probably try to switch to E-85. What intake do you run/suggest Marv?

On the 220's I found out the hard way about the valve spacing. I bought some cheap Ebay shaft rockers and they wouldn't fit, luckily! I was leary of using them anyway. I'm going to run Scorpion rockers. I'll pm you about the stud girdles.