• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

GS750 8V - VM29+small port 750 head -vs- CR31 + GS850 CV big port head?

Chuck78

Chuck78

Forum Sage
Past Site Supporter
So I'm building up another engine over the winter, and was hoping for some feedback.

I have some 9:1 870cc pistons and 850 cylinders. I have some big port CV-carb GS850 heads. I no longer have any good spare 79 750/850 small port heads, so I'd have to track down a good used one.

I have one set of VM29 smoothbores and 2 sets of Keihin CR31 smoothbores. One will be going on a GS1000-1105/1120/1135cc build I'm planning.
I could use the VM29 smoothbores on a 740cc GS550/650 hybrid build. I could also potentially trade the spare set of CR31 smoothbores for a set of VM29 smoothbores.


Now, given what parts I currently have vs what I'd have to trade for or buy, would it be a very fulfilling investment to send Ray my GS850 big port head for a valve job and street porting and run CR31 smoothbore carbs? Or am I much better off for a street/canyon carver/mountain twisties hot rod to run the smaller port head and VM29's?
I plan to maybe run the MegaCycle .354" lift camshafts, nothing bigger unless I go 894cc/920cc/944cc custom JE or Carillo Pistons, which I still may do if Ray talks me into this.


big port cv head + 870cc + CR31's too big for a fun responsive street bike?

Street ported small port VM head + 870cc + VM29 better bet? I'd have to trade carbs and find another good 79 750/850 head (hard to find 79's vs 77-78 750-only, 79 had extra bolt hole at front to fix oil seepage at cam tunnel, as did all 80+ CV heads)

Thanks,

Chuck in Ohio
 
You must log in or register to reply here.
Back
Top