new engine build cam question

[wanna race77]

all new build sbc 4.125 bore 3.875 stroke. 6" rods 14.5-1 j&e pistons. mullins brodix outlaw heads 227cc runners. mullins super victor jr. intake willys 750 cfm carb on methanol. here is my question. i called every cam manufactuer out there. every time i did i got different numbers. hdere is the one i went with from comp cams. .648 intake and .645 exhaust. duration at .050 is 261 intake 270 exhaust. 107 lobe center. thats based off 1.5 rockers my t &d shaft rockers are 1.6 ratio. how can i expect this combo to work and is there anyway to tell whaty my cam specs actually are with 1.6 rockers ?

[wanna race77]

forgot to add this is in a ump modified!

[perfconn]

Whole lot more motor than you can use with an 8 inch tire regardless of what rockers you use.

[wanna race77]

i was hoping for around 700 horse. is that a do able number ?

[perfconn]

More like 750 if you do everything right.Carburetor is too small for a 415.You need a 950cfm.If you don't have a raised cam block,the small base circle cam will hurt you but 700hp is easy.

[wanna race77]

std cam location. the cam is a small base circle. do the cam specs see to be in the ball park ? thanks for the info. i will be looking for a better carb !

[perfconn]

You could use a few more degrees at. 050 and the lsa needs to be at least 108* for alcohol.Needs to be close to. 700 lift after lash with those heads.Don't know what intake your talking about.Its either a Victor Jr 2975 or a Super Victor 2925,can'be both but the Super Victor is better.
The moral of this story is what I learned from an engine builder about 30 years ago.Pick you an engine builder you trust and listen to him.You can't take ideas from several different builders and mix them together.

[RCJ]

Your lift will be around .690 with 1.6 ,.050 duration numbers gain around 2 to 4 degrees.I would install it on 107 c/l or retard a few degrees.

[perfconn]

More like. 670-.665 at the valve.You will only gain close to 1 degree under the lift curve by going from 1.5 to 1.6 rockers.

[ljdardy]

Call mullins. He'll sell you a cam that he uses.