Standard port heads will support 650 to 700 hp on a pump gas short block but everything has to be dialed in. The heads need to be very good. TF240 heads right out of the box will do it, I do not know if your Edelbrock heads are that good or not. You'll need to have them looked at by an expert to see how good they are.

Generally speaking it's doable to run 10.4 / 10.5 with those general parts at near sea-level conditions. I'd prob do a 511" so compression is easy with a shelf flat top and that will allow a big cam with 'easy' lobes. MW port opening and Intake will help as well as a 4500 carb.

if the heads are actually ported by Modern Cylinder Head then they should be close to the TF240 heads.

And good info again, I agree, even with the small heads 10.8 comp and a .650-ish s/roller and 500ci it should make that 650hp which@3700+ would put us into the 10.40's>50's brkt.@128-ish. I was hoping we could pull a few tricks out the bag to make up for those heads and increase hp, intake work etc. etc., cam specs etc., and was hoping someone could chime in with some of those tricks.

And thats exactly where we are with the 440 where you were Brad, around 540hp but we already have the heads but only a .580" sft cam with 1.6 rockers, If it wasn't for the fact that the motor needs a refresh and doing away with those 6pk rods and KB pistons, a s/roller and perhaps another carb could've put us close to 10.50's, it does make sense to build a stroker now.

I guess not many if anyone has built a 500 stroker with CNC Eddy heads, but some have with TF240's which are comparable. I watched the Engine power 512 build with 240's on pump gas with a .640/670 hyd. roller and it only made 617 on the dyno with efi and 631 with a carb, somewhat disappointing I thought. It was a bolt on parts effort I know so perhaps with intake work etc. it would've made more, Other MW headed dyno pulls are in the 700hp range which says it all.

https://www.youtube.com/watch?v=oxTSrkp75ik

Just a quick update here, Eagle 4.150 stoker kit being ordered, probably TF270's now as selling parts off to pay for it, in region of a .660 s/roller 260-265@.050-ish and with 1.6's .704" and around 10.9:1cr, Indy intake more than likely as not much choice elsewhere, will use current good 830cfm DP for now until money permits a Thumper 1050-ish 4150 which I'm trying to persuade him onto, not cheap for 1>2 10ths, maybe more?, buy the best is my moto and opinion, maybe even a Dominator at some stage, so hopefully it will touch the 700hp mark on the dyno and with a bit of weight loss a 9 sec car could be the order of the day. Now thats worth all the expense in my opinion, from 11.1's>9.90's?

Managed to buy a Dana 60 at a good price with 4.56's strange shafts and 1350 u which will be changed to 4.10's to run with 28' hoosiers, hopefully won't have to change carriers?. And either an ATI/Dynamic or similar good co. will be used for a built verter, just hope he won't go shy on a 5k-ish stall. Things are moving on>>>
thanks for the replies guys.

Just a tip.
Get Jim to install "Pro" gears rather than street gears

I'll try, not sure if he's got that in mind, if your gonna do it I guess................by the way what converter u run Tig, tight 5k?

It used to stall @ 5200, then we changed rear gears from 4:10's to 3.73, now it stalls at 6000 ??? It was originally built by ATi for our 528 mega block deal. Don't know if it's the 'box or converter, I will have a look at it before we are out with it again but pretty sure we have been blowing through the converter. We also had to change carriers (Detroit locker) our 4:10 street gear (which we smashed) was a on carrier for thick gears (the pro gears are normally thin) you can use a spacer with the 4:10 and down carrier but not the other way round, it's also getting hard to find Dana 60 parts DAMHIK AND you can get 4:10 ratio's with thick and thin crown wheels.

The one in my RB 452 is 265/265 @ .050"; ^^^ seems small to me for another 50 cubes

And to me as well but I'm trying to be street sensible, not one of my strong points. I ran the .590 271@.050 in my street 340 Cuda and didn't think it was wild at all and a .650"-290@.050 sft in the all iron 440 race only car, thought that was quite a mild cam as well tbh! I'm hoping he will listen to my suggestion to go with 1.6 rockers, a .660-ish s/roller with easy lobes for .704" less lash then those 270's will be used better. AndyF mentioned the 270's require a specific cam. He'll have to look into his build again to pick the right cam.

Perhaps Dwayne could chime in if he sees this with a recommendation now we know most of the spec?

In my 470 the 270 cam was too big. The engine made more torque and more HP with a smaller 264/268 Comp roller that Dwayne picked. The TF heads have really good flow numbers at low lift and if the cam is too big the power will drop since the intake charge gets blown out the exhaust. We made 780 hp with that 264/268 cam. OP is only looking for 650+ power so I'd stick with something really close to that 264/268 that I got from Dwayne.

>>>.hoping for 700 now with those 270's, may even get a touch more?

Best power number we saw with my pump gas 470 was 780 hp. But that was with a Wilson ported intake and a Dominator. You won't get close to that with an as cast Indy intake and a 4150 carb. But you could see 725 hp with the correct camshaft, correct headers and a port matched intake.

I think the port matched intake he will do as he did his M1 for the Eddy heads on the 440. What would you say a correct camshaft would be, similar to your 264/268 but it won't have the lift, I can try and persuade him to go 1.6 rkrs on a ..660" roller to .704" but think I'm going to be hard pressed to get him to accept that, the street mentality beckons too much still I think although he's up for the race part of it more recently......2" hdrs will be the ones he should have more space in an E body for that with a low deck. 725hp would be ok, lose 100lb or so and we got a 9 sec "street" car, now thats worth spending the money on.

If the car is still going to see street use, lobes like Andy's 264/268 are too aggressive. And milder lobes with that duration won't have the same high-lift area.

Bill Jenkins' book from the '70s talked about adding or subtracting about 4 degrees duration for each 25-30 ci displacement change to keep the same general power range. That''s why I thought of my endurance roller (265 at .050', .650") and figured for another 50 cubes it would need to be bumped up to 270+ w/ the same lobe family. Adding more rocker ratio doesn't necessarily work the same way, since it changes the acceleration rates and messes with the overlap triangle, too.

Regardless, simply more things to consider...

You know something, I think I should take Dwayne's advice when I was crewing with my mate with the 589ci RR and discussing about it. Don't get too involved it'll hurt your head. My buddy does listen and learns BUT, I think its best if I leave things until I get asked something for my own sanity. I love the Tech side but again its best to let it lie I think for now.
I thank you all for your input.

Before settling on a RR, might be worth reading through Andy’s rocker ratio tests on the TF heads.

Yes and your correct actually, hardly worth anything, I remember reading it some time ago. I suggested 1.6 rockers for his 440 previously and he went and did it and said it picked up but thats a whole different combo with a mild sft cam and a 3500 hughes verter. Put the rockers on and bought a used TCI verter that flashes to around 4800 and picked up .5 for not a lot of $$$.

What is the life span of this low deck assuming you shift below 7000 Andy??