[Hillard]

I have my own ideas but curious what others think. 455 block, 4.21 bore, 4.5" stroke, 12.5 compression, ported E-heads, solid roller 262/268 duration@ .050", .670" lift, 112 lsa, port matched Victor, 1050 Pro Systems E85 Dominator.

I do not know the actual flow of the heads but from my experience I would guess these to flow in the 310-320 range. Unfortunately these heads have been through catastrophic failure before and were repaired. There's one combustion chamber that doesn't quite match the shape of the others.

And sorry, but I won't be taking it to the dyno to find out who is closest. I'm trying to get this car finished and ready for Norwalk, so there's just not enough time for the dyno.

[4dblnkldude]

620hp and 645 TQ. 9.72 in 3500# car. Theres my stab at it.

[Scott Stoneburg]

660 HP.
What car are you putting it in? Good luck.

[Hillard]

Originally Posted by Scott Stoneburg

660 HP.
What car are you putting it in? Good luck.

It's a 74 Firebird that was once a Super Stock car. So it's backhalved w/ ladder bars and leaf springs. Like to change it to coilover at some point. All steel for now. 9" w/ 4.30 gear, T-400

[Hillard]

Originally Posted by 4dblnkldude

620hp and 645 TQ. 9.72 in 3500# car. Theres my stab at it.

I was thinking somewhere in the 650 range w/ torque numbers to match. Car probably is close to 3500 but I doubt I hit 9's. Maybe if I had more gear?

[padgett]

7500 rpm. Once.

[Scott Stoneburg]

You plan on running the 1/4 mile? If so the gear may be a little steep depending on tire size. I have 3.73s, run a 275 drag radial and come across the finish at 6700-6800. Shift at 6500 running low 10s at 132.

[Stan Weiss]

700 + HP and it should run in the 9's.

Stan

[Hillard]

Originally Posted by padgett

7500 rpm. Once.

Nooo... no plans on turning 7500.

[Hillard]

Originally Posted by Scott Stoneburg

You plan on running the 1/4 mile? If so the gear may be a little steep depending on tire size. I have 3.73s, run a 275 drag radial and come across the finish at 6700-6800. Shift at 6500 running low 10s at 132.

I think I'll be fine. Tires are 14.5 x 32. Plus these big tires grow more than your radials. How tight the converter is also plays a big part, so we'll see. I'm hoping to cross the line something a little less than 6500, maybe 6200-6300. Local track is 1/8 mile anyway, but I want to run 1/4 at Norwalk also.

[steve25]

650.

[AG]

I have a similar cam size with 11.2 CR, 330 cfm heads, similar cid and run 10.0 at 134+ mph in a 3550 # car shifting at 6500 rpm and crossing the line at 6700 rpm.

[Half-Inch Stud]

550 HP at 5250 rpm. Much higher HP above that, like 650 hp at 6200 rpm