Engine porn

jon coleman

in n out.double double w cheese
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hmmm, efi pump, hook hose to lever/ ball valve, then hook up to a tube with a threaded end to accept mikuni jets, holly jets, what ever, in throttle body , simple butter fly style, sooo you push gas pedal valve opens, squirts e85& is in tune with butterfly position, badda bing( edit, wHaT CoUlD g0 Wr0nG?
 
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Slippery P

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Finally got a chance to finish the port work on these manifolds, off to cerakote they go. Oh and those boogers in the radius of the last pic did get removed. 😉
 
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Slippery P

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@Slippery P when the guides are cut down, do you find excessive valve rock? Maybe it's a non-issue due to frequency of rebuilding a race engine?
These are intake manifolds, what is cut down are the injector bungs.
 

Bricoop

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Slippery P

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Very nice work. Can you share the tools/bits you use?
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These helical burrs from Headgames motor works do all the heavy grinding / shaping, then they are finished with a 36 and 60 grit cart roll.

Those helical burrs are a game changer in efficiency and finish, they remove material like a MOFO but at the same time don’t dig a trench.
 

Bricoop

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View attachment 246476View attachment 246477
These helical burrs from Headgames motor works do all the heavy grinding / shaping, then they are finished with a 36 and 60 grit cart roll.

Those helical burrs are a game changer in efficiency and finish, they remove material like a MOFO but at the same time don’t dig a trench.
Cool. I have a couple spares around I want to play with. Their website recommends to not use on steel. What do you use on steel?
 

Slippery P

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I don’t do very much porting on Iron, but if I do I have some ferrous metal burrs.
 

Slippery P

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The scrap bin. I'm not sure there is any reason to port iron heads anymore. It's way easier to paint an aluminum head to look vintage than to port a vintage head.
The last iron head I ported was an AMC 401 head, the casting was soooo bad. I couldn’t put it together that way.
 
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scottm

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I like those helical burrs. Straight cut course-tooth burrs hog too fast on aluminum, too dangerous to use around gasket surfaces or seats. I usually use a fine tooth helical single-cut burr like normally used on steel, but spray a little teflon lube on the aluminum to prevent clogging. Slip, do you use electric grinders? I have two electric makitas. They spin too fast to use long shank burrs like your helical burrs, so I control speed with an old Variac variable transformer. Air tools are easier to use, but I don't want to torture my compressor.
 
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