Im deciding on what crower cams to use on my LS all-motor set-up.

set-up so far:
P&P LS head, milled to have 10.3 comp.
crower valve springs and retainers
skunk2 i/m, hondata i/m gasket
STR fuel rail
B&M fuel pressure reg. and guage
Apexi SAFC
skunk2 cam gears
DC jdm 4-1 header
CTR n1 crank pulley
all oem gaskets (minus the i/m gasket)
stock b18a bottom end

Im trying to figure out wether the 403 or the 404 cams will make the most gains. Im not sure the proper comp. ratio to run the 404's. Having a stock bottom end is fine to run with the 404's ?

any help would be great. and yes i have searched! thanks

 

anyone?

 

404's make more power, but in higher revs than the 403s. Yes you would benefit from the 404s. Yes your bottom end is fine with 404s assumming you dont raise the redline

 

bump for advice

 

I have the 403's and I am now going to get the 404's. That should tell you something. Get the 404's

 

anybody run into some serious issues tuning the 404's? i heard there a bit more difficult to tune than the 403.

thanks for the responses so far guys

 

i dont think its possible to mill the head on a stock motor to get 10.3CR, how many thousandths did you mill it?

 

Well i bought the head milled, the owner said nothing on how many thousands were milled off but only said it was milled to have a c/r of 10.3. Maybe somebody can help me out and tell how many thousands were taken off. Know im worried if the head was milled to much

 

sup ricer

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ImazzRacingDevelopment &raquo;</TD></TR><TR><TD CLASS="quote">sup ricer </TD></TR></TABLE>

ricer? i dont sport a slush box

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by OneSlowDA &raquo;</TD></TR><TR><TD CLASS="quote">

ricer? i dont sport a slush box
</TD></TR></TABLE>

yo fool, i saw u in ft. pierce on tuesday. I was gonna get your attention but my I was adjusting the boost on my Mines Skyline GT-R...currently @ 42.6 psi...You wanna go to the track with me one of these days?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ImazzRacingDevelopment &raquo;</TD></TR><TR><TD CLASS="quote">

yo fool, i saw u in ft. pierce on tuesday. I was gonna get your attention but my I was adjusting the boost on my Mines Skyline GT-R...currently @ 42.6 psi...You wanna go to the track with me one of these days?</TD></TR></TABLE>

uh huh......

 

If you are going all motor LS, You need to raise the CR to the 11's and get 404's. Look at my sig for times and I am running a stock head, no P&P. Good Luck!!!

 

yeah i dont think only having a c/r of 10.3 would ba able to take full advantage of the 404's, so the 403's are making sense

 

403's fool

 

Go with the 404's

As long as you mill off about .018" you will at least stay in the stock dynamic compresson range. You will make more power with the 404s even with lower compression.

You would have to mill off like .05" to get 10.3:1, people say its safe to go .03" and anything after you MUST clay for clearances.

 

i think i made a bad decision on buying this head that was milled to hell

 

are the 404s more than the 403s?

 

Need to have more of compression.

Also, I noticed you have a 4-1 header JDM 2.5", get rid of it.
Its design for Vtec motors. If I recall, its like 6-9hp loss vs a 4-2-1 header.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BERT-O &raquo;</TD></TR><TR><TD CLASS="quote">Need to have more of compression.

Also, I noticed you have a 4-1 header JDM 2.5", get rid of it.
Its design for Vtec motors. If I recall, its like 6-9hp loss vs a 4-2-1 header.</TD></TR></TABLE>

I disagree.

GSR's make what 160-170whp with boltons? (including the 4-1 header)

I made 165whp with just 404's

 

i think style teg would dissagree with you on the comp ratio and header,his setup is the ****....and his comp ratio isnt that high.

 

beat me to it

 

styleteg have you gone to the track yet?1/4?

 

I spun a bearing at the track before I could make it to the strip.

Once I get the cams into my B20 I will go for sure.

 

thats reminds me, i have about 182xxx miles on the bottom end, but no sign of problems yet, will this be a issue in the future? i really dont want to pull the bottom end out.