I'm starting to investigate the availability of performance heads for my 4.0L SOHC V6.
Morana Racing with a $300 core charge (for a pair) offers three options:
Stage 1 for $700 includes rebuild, 3 angle valve job, match ported & lightly polished around the intake/exhaust ports.
Stage 2 for $980 appears to include Stage 1 plus porting & bowl work
Stage 3 for $2300 appears to include Stage 1 & 2 plus best street porting, larger intake & exhaust valves, heavy duty springs
I didn't find any performance results for the above on their website and I haven't found any posts on the internet for Mustangs, Rangers or Explorers using their heads.
Super Six Motorsports (SSM) with a $300 core charge (for a pair) offers two options:
Eco Heads for $1150 includes gasket matched exhaust ports, blended intake & exhaust bowls, unshrouded valves, standard valve job, new seals & springs w/shims, surfaced and assembled, 220 CFM/168 CFM exhaust, use with stock or regrind cams
Stage 3 for $1900 includes fully ported & polished intake & exhaust ports & bowls, unshrouded & polished chambers, 1.86/1.56 swirl polished stainless steel valves, new valve springs w/shims, 236 CFM intake/176 CFM exhaust, use with stock or regrind cams
Their website has a dyno graph for a stock Mustang with Stage 2+ (equivalent to Eco?) heads with a 25 increase of max rwhp and larger increases at lower engine speeds. They did not post the performance increase for the Stage 3 heads. I found a thread on a Mustang forum for a build using the Stage 2+ heads, stock cams, Manley rods and pistons, 63 gph injectors, a MP1900 TVS blower (14 psi) and a custom tune. The engine produced a max 342 rwhp and 347 rwtq and has provided reliable transportation to date for more than 40K miles.
I've read that there are no significant idle issues running the Stage 3 heads with the SSM reground camshafts but that fuel economy suffers. I would like to find out what the performance increase (and disadvantages) would be running the Stage 3 heads with stock camshafts. Larger valves seems desirable but may have little effect without larger lift cams. Also, the gains may be insignificant at low to mid engine speeds.
Morana Racing with a $300 core charge (for a pair) offers three options:
Stage 1 for $700 includes rebuild, 3 angle valve job, match ported & lightly polished around the intake/exhaust ports.
Stage 2 for $980 appears to include Stage 1 plus porting & bowl work
Stage 3 for $2300 appears to include Stage 1 & 2 plus best street porting, larger intake & exhaust valves, heavy duty springs
I didn't find any performance results for the above on their website and I haven't found any posts on the internet for Mustangs, Rangers or Explorers using their heads.
Super Six Motorsports (SSM) with a $300 core charge (for a pair) offers two options:
Eco Heads for $1150 includes gasket matched exhaust ports, blended intake & exhaust bowls, unshrouded valves, standard valve job, new seals & springs w/shims, surfaced and assembled, 220 CFM/168 CFM exhaust, use with stock or regrind cams
Stage 3 for $1900 includes fully ported & polished intake & exhaust ports & bowls, unshrouded & polished chambers, 1.86/1.56 swirl polished stainless steel valves, new valve springs w/shims, 236 CFM intake/176 CFM exhaust, use with stock or regrind cams
Their website has a dyno graph for a stock Mustang with Stage 2+ (equivalent to Eco?) heads with a 25 increase of max rwhp and larger increases at lower engine speeds. They did not post the performance increase for the Stage 3 heads. I found a thread on a Mustang forum for a build using the Stage 2+ heads, stock cams, Manley rods and pistons, 63 gph injectors, a MP1900 TVS blower (14 psi) and a custom tune. The engine produced a max 342 rwhp and 347 rwtq and has provided reliable transportation to date for more than 40K miles.
I've read that there are no significant idle issues running the Stage 3 heads with the SSM reground camshafts but that fuel economy suffers. I would like to find out what the performance increase (and disadvantages) would be running the Stage 3 heads with stock camshafts. Larger valves seems desirable but may have little effect without larger lift cams. Also, the gains may be insignificant at low to mid engine speeds.