Thread: need help with cpu dyno

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Finally putting block together wont be a roller this year. but if you guys could help me with a computer dyno that would be great 400sbc + 0.40 block speed pro FT pistons 5.7 rods 3.75 crank 9:8:1 compression 441 heads 76cc ported polished milled. block is zero decked cam i Have two. comp 268XE= @50 224 in 230 ex lift 0.477 intake 0.480 exhuast. the other is a Comp 274XE= @50 230 in/236ex lift intake .0487 exhuast .0490 both are hyd cams waiting for dyno to see which one to put in air gap performer intake ,holley 750 carb 1 5/8 full length headers thanks for all the help

I had stock flow numbers for the 441 but since you said yours were ported, I just bumped the numbers up some assuming you had 2.02/1.60 valves.

XE268H 1st
XE274H 2nd
XE284H 3rd

I have a lot of other cam files if you want to try something else. Have flow numbers by the way?

thanks alot autometer i can sell the 274 cause their s not much of a power difference and the 268 seems more streetable. new heads and a roller cam next year should get me deep in the 400 hp range

Here's with the XE274HR

How accurate do you think this program is??

northen auto sent me the wrong pistons so now i have the KB pistons with a 7cc relif and their 10:1:1 this is higher than i wanted but they said they cant get any full floating pistons in from federal mogul so they just sent me the pressed pins so be careful when dealing with them i guess i'll be running 94 oct an some octane booster but i wont be driving it much anyway so that wont be a problem will this boost my horsepower the slight compression change