These heads, that I'm about to start porting on, were rebuilt some 15 year ago. Do to dropping a intake valve, stuffing it through the piston, cracked the cylinder wall. Beat the crap out of the combustion chamber.
Required a seat insert in the intake to save the head. had all exhaust seat replace so that i didn't have to worry about unleaded gas any more.
Because the newly installed seats left a bump in the port bowl, i ground the bowl out a lot, and then made plastic templets to match the other Intake and exhaust bowl areas.
I had all new valves, and bronze guide installed while it was there.(1.88 intake and 1.60 exhaust)
bolted them on my 340 and the car slowed down by a full sec.
after 3 mouth, i had enough of these head. (The eng would pull to 7200 rpm but had nothing until 4500 rpm) they didn't work vary well with my 2800 stall.
Put my "X"(2.02) head back on. Runs low 14's in the 1/4 at 4400 feet.
A good 15 years later,.......... I have a flow bench and found these head in my friends barn. some what preserved..............
There real isn't much out there, on how to port one of these heads. So hopefully some one will be able to learn from the experience I'm about to get. :;):
I have been chatting with ray(coulterracn) a lot lately.
I pored/pulled my first mold, of my intake port, and posted it up in my Bench thread(Melamine?)
I asked Ray if he could give me some tip on how to port these head. I sent some picture of the intake port to him and he doctored them up, and the mold pic's i had posted.
He encouraged me to post then up on here for all of us to see and examine.
He "said" post them up on the bored and maybe we will both learn something
I will have to post the pic up tomorrow.
My goal is to get them to flow better at lower lift.......Or maybe i should say more efficient. My 340 has a .474" lift cam. And i would real like to squeeze a little bit more bottom end out of it.
If not, then it will be a grate candidate for my 410 ci Stroker(a, someday dream)
Thanks in advance.
