I have a stock bottom end GSR wit the basic bolt ons and I am now ready to upgrade the cams but plan on keeping the bottom end stock. I don't really know much about cams or understand the numbers about them so I turn to you guys for help. I know that I would like to stick with Skunk 2 but I don't know which ones to get. I plan on getting better valve springs and flate face valves and a thinner head gasket to up the compression.

 

itr/ctr

 

S2S2

 

i ran bc3 on my gsr w/ stock block for about a year. Pulled nice in low and mid range

 

ITR,BC3+, SK2 stage 1

 

stage2's 4sure! ran the stages 2's on a stock motor basic header,intake and es exhaust ran hard plus add a 100 shot went 12.8 all day

 

ITR/CTR no need to change springs and retainers if you run the stock redline. Anything else and you'll want to upgrade springs and retainers.

Suggestion is to look for dyno plots here on HT for similar setups and then decide.

 

I was in a similar predicament but I went with full ITR cams and valvetrain, I'll let you know how it pulls after I tune it...

 

i would go with bc3 or skunk stage 1, or blox a, cams since your upgrading valvesprings, i wouldn't get titanium retainers. Im running bc3 cams w/ supertech v.s. and stock retainers and keepers. If your set on getting a flat valves, the supertech flat valves are good for a 0.08 bump in comp. I spoke to a rep. from supertech and he told me the flat faced valves bump up comp. 0.005 per valve which is 0.008 for 16 valves.

 

ITR, some sort of stage 1 (Skunk, Toda A, Schpoon...), RM M21X, etc.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">S2S2 </TD></TR></TABLE>

x2

 

CTR

 

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

x2

i used a pair of CTRs in a stock GSR over a year ago.

 

If you didn't get them for free, were they worth the money?

 

im thinking about using s2p1's or hte blox copies (not sure which ones yet) in my jdm gsr, i know im going to do a thin headgasket, and i may do valves to get the compression close to 11 :shrugs:

 

S2S2's

 

supertech flat valves only bump up CR 0.08. Its a 0.005 bump per valve. Id do the 2-layer HG if you got the P2H clearance. Good luck