Current combo is a 10-1 505 with box stock stealth heads and comp xe hydraulic flat tappet 240/246 507/510 110 and 850 carb. Assuming I wanted to keep this cam but open to the idea of changing heads to gain more power (provided the gains would be fairly substantial)....Which heads would you recommend? It's a street car with a 4 speed 3.55's.

Just in the idea phase and no ideas are bad ones right now

Thanks!

Sell the Stealths and look into buying a set of Trickflow heads.

Send the Stealths to Modern Cylinder head for CNC porting.

Sell the Stealths and step up to a max wedge port size or bigger
My old pump gas Duster ran high 10.60s with ported big valve 906, ran 10.30 with CNC ported eddy RPM and ran 9.993 with a set of Indy SR M.W. size intake ports non CNC ported
I did dyno test a set of CNC ported 440-1 on that motor and they where 50 HP better than the SR M.W. heads, I put the ported 440-1 on my bracket race 526 C.I. high deck 440 motor to sell it
Bottom line is more air, more fuel, more power

Assuming you want to keep the same cam, what is the usable rpm range of that cam and valvetrain ? If the motor would be limited to say 6,000 rpm, a smaller port head MIGHT be a wise choice, especially with a 3.55 and 4 speed. A comparison of dyno sheets would be nice to see between small and large port heads on a +500 inch motor

I am torn between STD and MW ports for my 493 re-fresh

A bigger carb would help[1050],IMO.See if you can borrow 1 1st.

That's close to the 505 combination in my Coronet. 440 source kit with 17cc dished pistons. My stealth heads have been slightly ported, cleaned-up, and multi-angle valve job and now flow a true 290+ cfm with pretty good lower lift flow numbers. They can be ported even more, but I'm running a mild Hydraulic roller cam, Comp XR286HR-10, with HS 1.6:1 rocker arms.

I bought the Trick Flow 240s (TFS-6161T784-C00) for another 505 engine. They are pretty nice, and flowed as advertised out of the box. They recommend a slightly different version of the Harlan Sharpe rocker arms S70016KE, but I haven't compared the two sets to see what the difference is? The smaller chamber would raise your compression ratio also. For this new 505, I am using the 27cc dish pistons to keep compression down for junk gas, but using a slightly larger solid roller cam, Lunati Voodoo 40230732LK, 243/249 @ 0.050".

If your looking to build a wilder, higher HP engine, then start with the larger Max Wedge sized port heads (Trick Flow 270) and intake, and get a larger cam.

I don't expect to spin this past 6 grand.

Great ideas. I'm also curious to know if Max wedge ports would be beneficial in a lower rpm set up like this? So if I wanted to run trick flows, I would need special 1000 dollar rockers? Makes them not such a great bargain. I guess if you need rockers anyway...

Good info, Cab. The 906 to CNC eddys is probably the type of switch I'd be looking at. That picked up quite a bit. Just head swap and no other changes?

I would hate to see you dump 1000.00 more into a set of Stealth heads having them ported and then crack like another member recently posted. The Stealths have their place for many and can easily flow 300 cfm but and I’ll leave it at but.

I agree!

I was thinking the same thing ^,
the stealth heads are nice for a milder stuff, but if you are going to port them to flow high numbers, it seems much more effective to just buy the trickflow heads.

I wouldn't put more money into them.

on your port size, it's a big motor, I'd be considering MW port heads...you ever think you might step up the cam size???

Change the cam when the new or updated heads go on.

I had my stealth mildly ported 2 years ago. Gains were minimal. (Maybe 1/2 tenth in the 1/4). Last fall I bought a set of TF 240s and picked up 3 1/2 tenths. (Not a total apples to apples comparison as I did go to a smaller cam, smaller tube headers and up my compression by about 1/2 pt).

If I had to do over again, I would never had the stealths ported, I would have just bought the TF 240..

I agree. My 500 loved my old 690 lift cam and the springs lasted forever. May not be what you are looking for but hey, we are good at spending others guys money. Lol.

The ootb stealth vs RPM vs ported vs ootb TF 240 on a pretty hot street 505 type build would be an interesting and fun dyno thrash.

Oh sure, next thing you know it's a race car!

Is there anything else.

While we are on the subject of the Trickflow heads...

The softest springs in the Trickflow heads are probably good for all Hydraulic cams?

Are they OK for any mild Solid lifter cams or would the best thing to do is the mid level springs?

That might be something the OP wants to look since he can get either spring package in those heads for basically the same price.