doubtful if YOU can pull the 400 HP on a set of heads and stock cam!! probably was done though!! And yes a dyno engine in a controlled dyno room isnt real life, and there was no comparison engines run to see an apple to apple comparison..
Yes, there have been a number of 400 +HP 302s on ported heads ( 289's and 5.0's) that seem realistic and do able, however NOT but the average Joe that puts a bottom end together , tosses in a camshaft, and heads and runs it!!
ALL that being said.. the same site as mentioned.. the P's with their meager 190/127 @ .500 will allow 391-424 HP, the GT40's.. 187/129 @ .500 will support 385-417 HP or maybe the X head.. that has a 215-155 @ .500 and will support 442/480 HP!!! Not to mention the PORTED E7s and their posted numbers will allow 446/ 484 HP on their 217 / 174 @.500 !! My heads are at 219/ 154 @ .500 lift!! Looking at the .600 lift , or the .700 lift is a total waste of time on the average street/ race car!! the Low to mid are more important than the total lift , as you go thru those numbers two times , and peak only once!! Dont for get the runner CC's.. the Valve job... the FASTER the engine builds power the SOONER the car is in front!!
There is a point when the average guy and shop are surpassed in the HP game.. 320 WHP is do able on a FMS cam and ported heads!! if you pull the 16% for drive train loss.. you are in the 380-390 BHP range!! There is no reason why there cannot be 350 WHP with a 351W on the Stock GT40 heads and definitely with PORTED GT40 heads!! ( 302-302 stuff)
You push in there the experienced builder, the correct camshaft, the intake and fuel.. there are guys hitting the 400 BHP mark on STOCK SBF heads!! Just be cause it is not the norm.. it is out there , and is being done!! Again the 302-302 is too strong of a statement!! 302 parts can and do equal MORE than 302 power!! add some boost.. or Nitrous.. and you can run easy 450 to 475 WHP on the ported E7s or GT40s...
SOOOOOOooo.... can it be done!! YES!! is it done all the time...NO!! is there more power in the AFR / TF/ aftermarket heads.. HELL YES!! But is it a guarantee for that power...NO!! The aftermarket is great for the SBF, but buying and bolting on, wanting a 12 sec ride ( 11 or 10s on power adders) Save the money.. go with the modified ported parts and remember.. 302 parts DOESNT mean 302 POWER!!
( and WHAT is 302 power anyway??)
If your looking for a 10 sec N/A ride in a race car (5.0) .. then the aftermarket is a good thing !!
Just me......................................
Thumper
Yes, there have been a number of 400 +HP 302s on ported heads ( 289's and 5.0's) that seem realistic and do able, however NOT but the average Joe that puts a bottom end together , tosses in a camshaft, and heads and runs it!!
ALL that being said.. the same site as mentioned.. the P's with their meager 190/127 @ .500 will allow 391-424 HP, the GT40's.. 187/129 @ .500 will support 385-417 HP or maybe the X head.. that has a 215-155 @ .500 and will support 442/480 HP!!! Not to mention the PORTED E7s and their posted numbers will allow 446/ 484 HP on their 217 / 174 @.500 !! My heads are at 219/ 154 @ .500 lift!! Looking at the .600 lift , or the .700 lift is a total waste of time on the average street/ race car!! the Low to mid are more important than the total lift , as you go thru those numbers two times , and peak only once!! Dont for get the runner CC's.. the Valve job... the FASTER the engine builds power the SOONER the car is in front!!
There is a point when the average guy and shop are surpassed in the HP game.. 320 WHP is do able on a FMS cam and ported heads!! if you pull the 16% for drive train loss.. you are in the 380-390 BHP range!! There is no reason why there cannot be 350 WHP with a 351W on the Stock GT40 heads and definitely with PORTED GT40 heads!! ( 302-302 stuff)
You push in there the experienced builder, the correct camshaft, the intake and fuel.. there are guys hitting the 400 BHP mark on STOCK SBF heads!! Just be cause it is not the norm.. it is out there , and is being done!! Again the 302-302 is too strong of a statement!! 302 parts can and do equal MORE than 302 power!! add some boost.. or Nitrous.. and you can run easy 450 to 475 WHP on the ported E7s or GT40s...
SOOOOOOooo.... can it be done!! YES!! is it done all the time...NO!! is there more power in the AFR / TF/ aftermarket heads.. HELL YES!! But is it a guarantee for that power...NO!! The aftermarket is great for the SBF, but buying and bolting on, wanting a 12 sec ride ( 11 or 10s on power adders) Save the money.. go with the modified ported parts and remember.. 302 parts DOESNT mean 302 POWER!!
( and WHAT is 302 power anyway??)
If your looking for a 10 sec N/A ride in a race car (5.0) .. then the aftermarket is a good thing !!
Just me......................................
Thumper