amjadZ28SS

can the spring pockets be machined to fit those springs?
I'm runing a radical cam past 8000 RPM so I'll need a lot of seat pressure

driver56

I'd say "no". I worked on a set of ported 243's that had been cut for 1.4x springs and the edge of the spring pocket went through the roof of a couple of the intake ports. Had to do a little epoxy work to fix them.

El_Diablo

iTrader: (9)

What driver said and the fact that it'd probably rip the rocker arms out with all that pressure.

amjadZ28SS

is there away on earth to run solid camshaft on stock heads then?
the custom cam fo my application recomended by comp cams
needs 210 on the seat and 523 open
can I use stronger shims under the springs to spread the load
I have 2 sets of shaft mount rockers jesel and patriot will they still need to be cleared for springs larger than 1.3

Fireball

iTrader: (21)

Not if you run shaft rockers...which would be required for a S/R setup


Dunno how accomodating the heads will be though, port walls on some ported heads are pretty thin so you run the risk of the spring pushing thru the head...if you're looking to go that radical...why use OEM heads

El_Diablo

iTrader: (9)

what I meant was the rocker arms actually tearing out of the head at their base. Perhaps I'm thinking wrong?

KCS

iTrader: (20)

You can run that large of a spring, it's been done successfully plenty of times, but it takes some work. Unless you already have your portwork to run over 8000rpm, it's probably not worth it with the aftermarket heads available.

Which naturally begs the question, why OEM heads?

vettenuts

iTrader: (4)

Did you talk to Comp about removing mass from the system? There are two ways to go, more spring or less mass. Also, for stock rockers, LPE makes a steel rocker brace that replaces the OEM aluminum that will help provide some additional support to the stock rocker. If you are LS6 stock size valves, the LS6 valves will help along with Ti retainers and a good beehive spring. Although, you don't give cam specifications only "radical".

amjadZ28SS

cam specs as follow
Lift with 1.7 rocker arms .644/.644
Duration @.050: 231/231
LSA:115
Advance ground into cam:4
as comp said "This is a hydraulic roller cam, but you will need to run solid roller lifters on the cam"

this is for a twin turbo 347

these heads been worked by Wegner motorsports they are the same heads they used to use in there NASCAR engine but I bought bare.
the blans back then was to build N/A engine then it changed to twin garrett gt35s

I have 2 sets of adjustable shaft mount rockers to use I have Jesel & Patriot and going to use SS valves stock sive thu

I have alot of LSX parts in my shop and I'm trying to make them work for me

KCS

iTrader: (20)

No offense, but that doesn't look like much of a radical cam at all. It sure doesn't look like enough to support a 347ci LSx to 8000rpm, either. If you're going with twins, why do you feel the need to run so much RPM? Honestly, you should be able to get away with a hydraulic roller just fine, turn less rpm, and save some headache.

amjadZ28SS

this what comp cams and summitracing said about this custom grind
as you said I think I'll just go and look at site sponsors of the shelf turbo cams and save the headache
thanks for the help