Posted by Mark (IP: 192.62.107.213) on June 30, 1999 at 09:17:18:
In Reply to: Re: So..what about stock 65 289 heads posted by scully on June 29, 1999 at 20:17:21:
: your 289 heads aught to have a little smaller chamber givine u a little more compression ,thus giving u more low rpm torque and a little mre hp.
: these shouldnt have any bumps in the exahast ports but the porst ar still a little borderline on size . i use a 25000 rpm straight die grinder with a carbide router for ruffing them and drum sander for finishing. (it does suck though) it takes me about 3 to 4 hours a head..
: i usually just gasket match the ports and intake.the uxahast arnt to bad
: but the intake runners are long and i have a long rod i made for doing them .just polishing them works good if u cant open them up.
: watch tht when they put the big valves in tht the opened the port under the seat up to (iv seen this happen) the port has to be big enough
: to feed the valves also. just look down the port and imagine your air at 100 miles an hour, and see if u could make it through there without getting the hell beat out of ya!!
Now that's one way to look at it.
Okay...what about wall thickness??? Where should I be concerned about that? Don't want to ruin a good set of 35 year old heads. I have no experience with this. Should I concider having a pro do it???