c-460 heads and Nos

so what would be a safe compression ratio with the c-heads ? ive noticed a lot of builds in the 15-16comp range ...do these heads have a fine line of tuning with the valve angles and no cant.

also would the cnc program change on these heads if the client wants a nos engine compared to an N/A motor ?

I run 2 C460 headed motors my 572 is 15.59 -1 and my 600 is 16.42 -1 , the tuning window is a little tighter on the 600 than the 572 but then again I've only burn 4 pistons in 200 runs and thats only because I like to walk up to the end and hang my toes over once in a while!!!
Frank

on the CNC program ,it's Charlies , only I milled the heads some after I got them !! 14.9 - 1 is alittle better as I think you could spray 4 -300hp kits ,then my 600 at 16.42-1 I might try the 3rd kit at the last race of the season but the tuning window will be tight and the pistons could leak out the header pipes !!!
Frank

LOL leakin pistons out the pipes isn't a good thing!!!

Leaking Pistons out the exhaust..I LMAO !! Reminded me a few years ago at VIR watching a final for Top Fuel at night....and seeing the Roman candles shooting out the Zoomies !!

dfree383 wrote:LOL leakin pistons out the pipes isn't a good thing!!!

That could get UGLY

IMHO I would have the compression around 14:1 max. Not saying you can not run more compression with NOS, because there are plenty of people out there running 15:1 or 16:1+ or more compression ratios with nitrous. Like has been said as you increase the compression ratio the tuning window gets tighter & tighter. I just think that once you get over 14:1, it is a case of dimensioning returns compared to the tuning issues which may occur especially if you are going to be running a lot of nitrous. In fact I have spoke to several very good nitrous tuners & the trend these day seems to run a little lower compression ratio say even down to 13.5:1 A friend of mine has a pro mod type of car & has run in the 4teens in the eight mile. Over the past few years he has been gradually lowering his compression & I think he is running approx. 13.5 now & he says it has not hurt the performance plus it gives him more room for error in his nitrous tuning. You might also talk to Greg Creech. He is a member on 460.com website. Not sure he is a member on this website. I believe he is running an approx. 600 cube nitrous engine with the C-460 heads. Good luck with it.

thxs for the input Kevin

You are very welcome. Good luck with it!!!