SM Head Modifications on a budget
I have one untouched port in a SM head that I purchased on Black Friday, and a box of SM 2.055 valves. These were all purchased for testing purposes anyway.
Since @pittsburghracer was gracious enough to volunteer my services for the testing, I will return the favor and ask that he serve as ‘mentor’ and suggest/provide an outline of the modifications to be made and an order for doing so (which step is first, which step is second, etc).
Here are the steps that I am considering, in no particular order. Please feel free to suggest additions.
*Valve job for 2.055 intake valve (must be done by a machine shop)
*Back cut angles on 2.055 intake valve (drill press and die grinder)
*Enlarge PRP width (die grinder and cartridge rolls)
*Bowl blend (die grinder and cartridge rolls)
*Head bolt bulge reduction (die grinder and cartridge rolls)
I intend to flow test between each modification to show the changes along the way.
Now PBR, give us an itinerary. What comes first and why?
The attached pictures show some similar tests I performed some months back. It shows the order that I performed some of these same tests on the same head but with a 2.02 valve.
This conversation was started in another post and moved here to avoid the hijack. PBR’s post above sums up his idea about taking SM heads, getting a 2.055 valve job done by a machine shop, then making the other modifications and improvements at home with tools that are inexpensive and readily available. So basically, how much improvement can a guy doing his own head modifications expect to achieve? Should be a fun exercise.
I have one untouched port in a SM head that I purchased on Black Friday, and a box of SM 2.055 valves. These were all purchased for testing purposes anyway.
Since @pittsburghracer was gracious enough to volunteer my services for the testing, I will return the favor and ask that he serve as ‘mentor’ and suggest/provide an outline of the modifications to be made and an order for doing so (which step is first, which step is second, etc).
Here are the steps that I am considering, in no particular order. Please feel free to suggest additions.
*Valve job for 2.055 intake valve (must be done by a machine shop)
*Back cut angles on 2.055 intake valve (drill press and die grinder)
*Enlarge PRP width (die grinder and cartridge rolls)
*Bowl blend (die grinder and cartridge rolls)
*Head bolt bulge reduction (die grinder and cartridge rolls)
I intend to flow test between each modification to show the changes along the way.
Now PBR, give us an itinerary. What comes first and why?
The attached pictures show some similar tests I performed some months back. It shows the order that I performed some of these same tests on the same head but with a 2.02 valve.