Hi all
Im going to dig into a set of 8445 heads soon, and need a little bit of guidance. First of all, im not going to buy champion irons, and any other expensive hardware. The set of heads I have seem to be in great shape, just need to upgrade the springs, that's about it as far as hardware. Also, I've ported a few other sets of heads so all the tools I need are in the tool chest. Now on to the specifics...
Pocket porting: What is a good size to open up the throats to? A few pros gave me a rule of thumb of 85% to 89% size of throat to valve size, but has anyone here found a good size for the stock size valves? I just don't want to open them too far and run into reversion problems.
Port size: Other than the bottleneck at the entry of the port, is there any reason to enlarge intake port any further? I was thinking of raising up the roof a little, but that's about it.
Profile: Some people choose to leave the finish in rough carbide finish, and it seems that Larry Meaux has found some horsepower in a rough finish as well. Just not sure how well it will work with a turbocharged application, and im thinking of only leaving the intake port with the rough profile.
link... http://hotrodenginetech.com/pipemax-creator-larry-meaux-on-race-engine-head-porting/
That's it for now...
Im going to dig into a set of 8445 heads soon, and need a little bit of guidance. First of all, im not going to buy champion irons, and any other expensive hardware. The set of heads I have seem to be in great shape, just need to upgrade the springs, that's about it as far as hardware. Also, I've ported a few other sets of heads so all the tools I need are in the tool chest. Now on to the specifics...
Pocket porting: What is a good size to open up the throats to? A few pros gave me a rule of thumb of 85% to 89% size of throat to valve size, but has anyone here found a good size for the stock size valves? I just don't want to open them too far and run into reversion problems.
Port size: Other than the bottleneck at the entry of the port, is there any reason to enlarge intake port any further? I was thinking of raising up the roof a little, but that's about it.
Profile: Some people choose to leave the finish in rough carbide finish, and it seems that Larry Meaux has found some horsepower in a rough finish as well. Just not sure how well it will work with a turbocharged application, and im thinking of only leaving the intake port with the rough profile.
link... http://hotrodenginetech.com/pipemax-creator-larry-meaux-on-race-engine-head-porting/
That's it for now...