Posted By: racealittle
440 source super stealth heads - 11/04/12 11:06 PM
Has anyone bought a set, looked at them critically, etc.?
I like the idea for a stock looking engine, but what has or can be done with these heads?
They have been out for a while now; looking for user or professional head porter reviews and opinions.
Posted By: Tom_440
Re: 440 source super stealth heads - 11/05/12 06:37 PM
Do a search on these. There are some haters but most folks are happy with them. They should be checked before installing (although many have run them out of the box). I have them on my very mild street 446 with no real porting and it dyno'd at about 470 hp and 530 tq.
Posted By: CSK
Re: 440 source super stealth heads - 11/06/12 01:14 AM
been a while,been pretty ill,but the weather has cooled of some & finally got my flow bench & heads to the house,so i got some #s together so far,
these are the 440 super stealth & this is for a street motor,my testing cyl adapter is 4.250 bore diameter, i will machine it to 4.4 when i can get to it
otb .200 140
.300 202
.400 242
.500 256
.600 267
.700 267
OK opened the seat up a little & did a little combustion chamber work, worked on short side & made max wedge size i am stopping here cause i dont need more flow,this is a street engine build,@ .700 they flow enough to make 688 hp,my cam will be .650 lift. these heads really want a bigger valve but to do that the seats would have to be changed,flowing the head with no valve they flow 360 not saying they would flow that # with a bigger valve but the would definitely pick up some.
2.14 valve
.200 164
.300 217
.400 264
.500 290
.600 314
.700 335
.800 345
Posted By: racealittle
Re: 440 source super stealth heads - 11/06/12 05:47 AM
Thanks csk, did you get any results on the exhaust side?
Posted By: CSK
Re: 440 source super stealth heads - 11/06/12 06:21 AM
not yet ,i will ck tomorrow & post results
