does anyone make these -and if so whats the biggest bang for the buck
could i use a 1.85 on a 226/234/558/575@112 without smacking a valve
heads arent milled -only 5 thow for resurface-stock head gasket
and if i could what would my lift be with them with the above cam

 

Nope, I think you'll hit a valve with stock pistons. 1.75 are good for around 4% higher lift. your intake might be good but the exhaust will be iffy.

 

bummer thanx

 

Yes, Comp makes them. Its their Pro Magnum series.

 

Whooo hoo! thanx--now does anyone know the formula for this for sure

 

On top you mentionned 1.75 which would make your cam 226/234, .580/.598 112lsa
Like I said .598 exhaust is tight.Head gasket used is also a factor.
Now with 1.85 this would be 226/234, .562/.632 112lsa which is a nono with stock pistons.
As a rule of thumb anything with over .550 lift should stick to the 1.7 with stock pistons. Unless you are willing to go with recessed pistons but that will negate the effect by decreasing the CR.
That is for SURE.

 

like i said in your old thread from before; its cheaper to have a custom grind done and get the lift you want then to go with new rockers.

 

Yeap and in any case PV clearance has to be carefuly measured with cam swaps. Eespecialy if you have milled or thinner gaskets. Never take anything for granted.

 

your math is completely wrong .558/.575
1.75= .574/.591
1.85= .607/.625 and you can run up to a .600 lift on a stock piston

 

ok but the g5x2 is 238/242 595 609 112+4 and that doesnt hit so i guess i'm a lil confused
Can anyone exsplain this stuff

 

[QUOTE=.....and you can run up to a .600 lift on a stock piston[/QUOTE]


How do you figure that???? Aren't we forgetting somthing about duration? A blanket statement like that is how valves end up embedded in pistons.

 

ok my duration is smaller than the g5x2 cam so why would mine smack with a 1.75 rocker

 

so i guess my question is with a 1.75 rocker would i hit with my 226/234/558/575@112
i have a line on a cheap set of 1.75's so i kinda need to know "for a fact" so i dont buy them and be stuck with them-and would i need to go with a shorter pushrod?

 

anyone?

 

Like JRP said man " it is much better to get a high lift ground cam, than to obtain it via rockers". Too much stress IMO and piston slap is possible. Take into consideration gaskets. Basicaly you should stay under.550 to use higher rocker ratios.
Can it be done? IMO tolerances would be slim and not worth the risk. PV clearance would have to be proffesionaly measured. Therefore negating the cheap cost.