Just got my Indy 440-1 heads back from Larry Smith. Awesome work! They look great. Started with OOTB 15 year old 440-1's. New Manley Severe Duty valves, opened the intake ports up to 572-13 openings to smooth out manifold transition, fresh valve job.
What kind of HP/ET gain should I expect going from a box stock 440-1 to fully ported? He's showing 390 CFM @ .700 lift.
Car specs:
68 cuda tube chassis 2950 w/driver
446 cid 13.5:1
284*/284* .704 lift Roller w/1.6 rockers
1050 Dom
4800 stall
4.30 gear 14x32 slicks
6700 shift
Previous best 9.80 @ 137mph / 6.20@110mph

Intake Pic's

Larry's Pic's

Are you only changing the heads but leaving the cam, carb and shortblock the same? Looks like you were around 600 hp on the Moroso slide rule before since that is what it takes to push 3000 lbs to 9.8 @ 137. I'd think those heads would pick up 100 hp even with the same cam and carb so that puts you at 9.30 @ 145. But who knows, at some point another cork shows up in the system. The cork could be the cam or the exhaust or the carb. You'll just have to get it back together and see how she runs. The heads look good, they should support more than 800 hp if everything else is up to the task.

Depending on how much money is in the budget you might consider a different cam. Talk to Dwayne about what type of lobes would work with your existing valve train but could pick up some power for you. I don't think a 284/284 single pattern grind is what I'd be using with those heads but see what Dwayne has to say.

I had Larry do my heads with basicly the same figures. At 455 cubes my cam is 290@50 & i have a 1200 cfm Dominator but use a 5800 converter, same 32x14 slicks, but 4.88 gears & I rev to 8000 rpm in a 2900lb car, I was able to run 9.2@142mph. I think you need to rev harder but with your combo I'm thinking 9.5's.

Probably slow down.........lol

Definitely needs more gear, and convertor.

I think the port work will really wake up that motor.
I second the idea that higher stall speed, maybe 5600 rpm would go with that combo.

2-3 tenths with everything staying the same........

That thought crossed my mind too.. Gonna need more gear and RPM now.....

How many cc's do those intake ports end up when you do that?

I would have never bet my 15-1 572 with a 3 speed 727 would need 6000 stall. It woke it up more than any other single change made in the last 8 years.
Doug

One thing I've noticed about Larry's work, not only are the ports super-pretty and beautiful appearing,
but he always seems to sand the exterior surfaces with a DA.

Ever heard the saying "you eat with your eyes"? Same idea if the customers first impression is WOW then that is what we are hunting for....I have been using Larry for years. Always good stuff. Work like that just takes time. Todd

Larry did our 360-1s on my small block. Couldn't be happier with his workmanship. He was really sick back then and still got my parts back to me. Heck of a guy and he does quality work..

More stall might be a good idea but the stall speed will increase naturally from the extra torque so I'd try it first. The car will have more power so the MPH will go up so I'm not sure it will need more gear. The trap RPM will probably increase from 6700 to 7000 just with the additional power and speed. Might not want anymore RPM than that depending on what parts are in the engine.

This is good advise.

Hahahaha

I agree with the trend, so the converter company will make use of the extra data. But I still think that "small 446" CID and long 284 deg @.050 duration will want high 5 grand stall speed for best perf.

Now I am coming from 500+ CID experience...

I am at 3012 lbs, torqueflite, 4.56 gears and 33 tall slicks. Stall is 6200 and the motor was 550 cubes, fully ported 440-1, 3x intake and alky injected. Still sorting out suspension settings. Best 60 ft 1.24 best mph 154. I mention all this because with the right cam i believe you will need to shift at 7600 and recovery needs to be 6600 because your best average hp will be in that range. I shift my 550 at 7450 rpm, recorded on a data logger. Peak hp on the dyno was 926 hp at 7200 and was still climbing.

They look great but I have no idea what you'll gain.

I certainly hope they make you happy.