66GSconv, the exhaust manifolds have a thermal barrier coating inside. I smoothed as best is I could before I had that applied.
Not yet, I actually swapped it with the other since the head porter pointed out to areas to touch up and roll back just below the seat. That was on Monday, probably next week sometime.
Spoke with the head porter today, not good!:ball: numbers seem lower than stock. He said he will flow it again to make sure int exh 200 44 55 300 80 71 400 104 83 500 125 96 600 146 109 700 163 120 he does not do nailheads that often, my heads were the last he saw in a very long time. like I said he will reflow them , maybe I should give him a chart to go by.
Good qustion Joe. Snake, ask him if he is flowing the head at 10 or 28 inches of water ect. Also another good thing to ask is what size bore adaptor did he use? Also did he use a entry plate, clay or nothing on the entrance. I have found it makes a big defferance. I am sure he knows what he is doing but it kinda sounds like it was off center because the exh. numbers are about or close to stock. Hang in there, I have flowed enough of these nailheads runners to know about where you were going to land after looking at your pictures and it should be better than stock from what we are seeing:TU:
He said they flowed them at 28 inches , if you look at exhaust the last step at .600 it reaches the max at stock of 120 cfm , not sure what he did but I know I didnt hog them out and want to say I made better than stock I hope? ray:
Hi Greg " riv kid". Hows the engine coming along? Did your head guy get your heads done? Getting closer to having mine done:TU: Snake , how is yours coming along?
The heads should be around 235 CFM intake and 150 exhaust @ .600", these numbers were on a 4.250" fixture @ 28". They might be slightly lower on a 4.188" fixture, but not by that much. These aren't easy heads to get working correctly, they are very limited for sure. A starting point is at least stepped down guides. (Add) Nobody likes to port cast-iron heads anymore (including us), it's very time consuming and labor intensive! Thanks, Gary in N.Y. P.S. These are similar numbers (above) on a friend's "Nail" stroker running out of Ma. with Tom's rockers. He's very close to the 10's, has seen 11.0's. This is a pump-gas unit! Just to add, Tom's rockers did make a nice "positive" difference on this particular ride.
Normally i would not ask this question as i know porting is very beneficial but it is actually worthwhile with these Nailheads? I am currently running a 64 engine but i have a spare 59 complete engine. Would it be worth my while to yank the heads off the 59 block and send them out for porting and put them on my 64 block with a cam swap or am i better off just doing the cam swap and keeping my current heads the way they are? Thanks.
If,,,,,,,If,,,,,, you are building a all out , competition engine, it is well worth it....because , once done that power gained never fades or changes....now , it is a question of just what you expect from the engine... I always say , ''never sell a nailhead short''.... they really perform for what they are,,, torque monsters..... dont do a port job and then expect them to suddenly become a rpm machine... wont happen... what will happen is that the engine will get the 5500 rpm A WHOLE LOT QUICKER .....but it is the same 5500 to 6000 rpm.... and dont be afraid to install some stiff differential gears... again the response will be a whole lot quicker....you can have all the power in the world but if you cant get it to the ground, you aint got nothin....:Brow::Brow:
Hi Whatever, it was kinda cool making them before and after a little porting. But I made something that I think is a little cooler than that. Last spring I made a clear casting of the molds so I can blow and suck smoke through them and see what the smoke is doing. They turnd out ok for a first try. Guess I should get back to working on this stuff. Man I have a lot of little projects to get to.
Ok, I was sitting around last night and started thinking about this stuff again. I took a long break since I last worked on my little hobbie of porting my nailheads heads and intakes. I am closeing in on finishing my wifes bathroom remodel, after new years its time to start back on my heads. One thing I found was I was able to get the same air from 1.90 valve as a 1.94. Also snakes heads flowed a small amount better than my valves with the stock 1.87 tulip. So I have a 1.92 tulip That I am going to try fooling around with. Anyone got any Ideas. Right now I am at 251 at .700 lift. But we all know that isn't useable. :grin:
