Port and Polish

[IRISH-RACER-14]

where would be the best place to send my 300ex head to be ported and polished?also who makes the best cam which doesnt require me to get harded rocker arms/ valve springs

[slightlybent47]

Not sure on where to send it to but I do know a good p&p job is important and not everyone can do it right. If it’s not cut properly it can do more harm than good. as for he cam it may have more to do with how much work has been done to the motor, if your doing a mild build it potbelly doesn’t need the rockers hardened.

Sorry I can help you mare then that.

[IRISH-RACER-14]

its a stock motor with full pipe and k&n air filter. i only want a mild port job and mabey a cam shaft. i need a new head anyway so i was thinking i might as well get the port and polish done and mabey a hot cams camshaft

[300racer]

i see alot of 300ex's with sparks motor work and janssen motor work. I don't know alot abotu 300's but i would guess 1 of those 2.

[Stiles86]

look up robbs racing the close to you as well www.robbsracingengines.com

[slightlybent47]

On my 400ex I did a 416 with 121/2-1 P&P and a stage two hot cam and used the stock head studs and I have been racing it for two years and it still runs great. I have had zero problems with it so if that’s all your doing then the hd studs and the rocker hardening may not be necessary. But it would be good insurance if you want to go that way.
I hope that helps.

[mx Eli]

janssen makes a nasty 300ex motor cal them and just pick there brain very nice people

[IRISH-RACER-14]

is it expensive to harden the rocker arms?

[300ex_#387]

Whats wrong with the head that you have that would cause you to need a new one?

[IRISH-RACER-14]

hard to explain. i snapped a exhaust bolt in half and couldnt get it out so i made a new hole and taped it and put a new bolt. i dont like it that way because it could snap anytime so i want to get a new head, and do it right this time so the studs dont snap

[rollie]

deff go to someone with a flow bench!!! BCS in Massachusetts does alot of 300 heads up here and they all rip, they also did my 450 head...

BCSPerformance.com

[IRISH-RACER-14]

if i send them my head to be ported. will they include the new bigger valves and springs?

[m0t0xk1d]

just call them up and tell them what you wanted done im they will do it for you. jay builds great engines at BCS they do my head and my bike rips

[hondaracing0144]

i just got a ported and polished head with a tc national cam does anyone how if i need to rejet my bike and to what jet thanks