Hks 272 Step 1 Or Other? Please Suggest

[rb26sedan]

i have the following setup on my rb26dett:

forged pistons

arp rod bolts

JUN oilpump

JUN crank collar

ati damper

ARP main bolts

tomei oil restrictor

tomei baffleplate

arp head studs

P&P head

1mm oversize supertech valves

garrett gt2860-5 turbos

greddy intake plenum

1000cc injectors

etc... etc...

my question is what cam is best suited for me?

i was thinking on hks 272 step1 or poncam B cams

i don't want to machine head for clearance for cams with more then 9.15 lift..

i will be putting valve springs and retainers also..

I want to be able to have a powerband till 9000 rpms..

what's the best cam for my setup?

[sickr33]

so your saying the head was ported-polished and machined for oversized valves but was not machined for big cams????

that seems very weird to me?

did you build it?

if not, might be a good idea to take the cam covers off and have a good look just in-case it has been done.

also i was under the impression the you have to take the head off to put in new springs and retainers so why not machined the head while it off so you can put some high lift cams in.

is saying all that i have

tomie Poncams 260deg 9.15 lift and i love them

give a nice lump/growl to the exhaust

i cant comment how how they affect the performance because i did a lot of work to motor at same time.

what i can say is that the Poncams 260deg will give you better mid-range (help bring turbos on earlier) and top end where the HKS 272deg and all top end

good luck

[rb26sedan]

so your saying the head was ported-polished and machined for oversized valves but was not machined for big cams????

that seems very weird to me?

did you build it?

if not, might be a good idea to take the cam covers off and have a good look just in-case it has been done.

also i was under the impression the you have to take the head off to put in new springs and retainers so why not machined the head while it off so you can put some high lift cams in.

is saying all that i have

tomie Poncams 260deg 9.15 lift and i love them

give a nice lump/growl to the exhaust

i cant comment how how they affect the performance because i did a lot of work to motor at same time.

what i can say is that the Poncams 260deg will give you better mid-range (help bring turbos on earlier) and top end where the HKS 272deg and all top end

good luck

the head has not been ported yet.. it will be ported soon...

but i have to select my cam before porting

i dont want lifts of 10 ish mm.. because of piston to valve clearances

i know i can't use hks step 2 cams because it requires pistons with relief for the valves...

so i assume that any other cams with 10ish mm lift will have problems with valve to piston clearance.. that's why i want to keep lifts in the 9ish range..

today i saw kelford L-182B cams... 272 duration.. 8.90 and 8.95 lift..

now i'm leaning more towards the kelfords