I have asked this before but differently. I have a gsr head with .5 mm os valves . I want to stay na but if i cant run a big enough cam i will have to go turbo or get another head. I have ported this head myself and it makes good power. Some say its head setup what does this mean. Is there a cam smaller than the skunk Stage 2s (marginally smaller) that might work well or how about the pro 1s does anyone know where i can compare the lift and duration of both. Can i run the stage2s if i adjust the cam gears. Which way would i adjust them. Sorry for such a complex question i just like na that much that i would hate to go turbo. Ive got a few mustangs to pick on that have been talking **** at work. Id like to get my engine finished with the big cams if possible. Thanks.

 

i guess ill waste my money on some cams and see what happens. Or tie a timing belt around the camgears and give her a turn.

 

i was told by a skunk2 employee that if you have aftermarket pistons, they usually have big valve reliefs therefore you should be able to run the skunk2 pro 1 cams fine, just make sure you get it tuned.

 

most of the manufacturers of higher lift/longer duration cams do not reccomend os valves. You can either call a few manufactures, skunk, crower, buddy club, rocket ect and see what they reccomend or mock up the head yourself and measure valve to valve clearance with a feeler gague

 

you won't know without having it mocked up, clayed, and degreed to see what your clearances are at various valve-lifts. then you can see what lift and duration cams you can safely run, and what lattitude you can afford regarding lobe separation.

there are too many unknown variables. e.g., the valve job. whenever the seats are machined, the valves will sit lower in the head than stock. obviously, this will change your clearances, as does using .5mm OS valves. if new valveguides were installed, the porter might have used OS guides and honed their holes at an offset angle to effectively space out the valves to accomodate for more cam tuning. aftermarket valves may be marginally longer or shorter than stockers, which also effects lift. rocker pad wipers as well as their undersides can also be altered.

since we don't know if any of this has been done, no one here can give you meaningful advice. take your setup to a reputable place what knows how to check these things, as ask them. they'll be much more effective in pointing you in the right direction.

good luck.

 

you can use ov but you have to sinck the valve into the port so in overlap they dont touch each other and also lock the vtec w/t the head in an engine w/o pistons rotate the engine and ck how much you can degree the cams w/o the VALVES TOUCHING EACH OTHER IT IS TIME CONSUMING BUT YOU WILL RUN SAFER LEAVE AT LEAS .030 OF AN INCH BETWEN VALVES AT OVER LAP.

 

one of these might help: https://honda-tech.com/zerothread?id=1394528