aftermarket camshaft question

[fst gsx]

Ok before i decide. I have a built head. I am wanting to install some custom ground camshafts Befo.re i have the company grind my camshafts i was thinking on going a 272/264 profile. which side would i need to run larger? my valves are 2mm larger than stock andi am running a holset h1c twin scroll.

 

[viperlp01]

Who are you having grind your cam shafts. If the person you are having do the work has any idea what your goals are or what you have for intake/exhaust manifold they should be the ones to talk to. Why did you put such a large valve in and how does the port work look? It would require a ton of port work to get a 2mm os valve to work well. We do custom ground Crane camshafts and we could help with the profile design. There is a ton more to it than just "264/272's"

 

[Brian O Conner]

A lot of this depends on were your wanting your power bands to be but seeing were you have ported your valves 2mm over I would have a large duration to add power in the high end rpm range.

 

[cdsm25]

Some people like the 264/272 setup as it was kind of popular 10 years ago, but anymore the 272 is the way to go with the h1c. I would start looking at your hotside. It looks like your running the stock turbine housing. I would get those cams ground at 272 and run a b/p hotside to help with the spool. Larger cams= slower spool but if you tighten the hotside up it will help a lot.

 

[BogusSVO]

Hope they changed all the valve seat inserts in the head, the factory seat inserts will not cut to take a +2mm os valve.

If the throat was not cut open to the larger valves, then there will be minimal airflow gain.

 

[fst gsx]

Yeah all of the seats are new and the valves fit very good. rather large valves if u ask me but they turned out amazing ill post a pic of my head porting i was thinking on delta but if a company can help me out id give 2 sets of 2g 4g63 cams and 1 set of evo 3 cams. And sport the company name on my car and at local events for a sponsorship

And im not looking to rev over 8k this 2.4 stroker will have a more lower to midrange powerband than up top. id like to keep it between 3k-7k if possible.and yes its factory twin scroll exhaust side.