That is correct for a hemi with big pushrods. The sleeves are notched as well, then you often have to grind more.also the hemu has 2 cylinders one way and 2 the other completely normal using the standard placement.

I think what you are seeing is it is very thin right there and I believe the one might have a little piece broke off. Not really a big deal because like said before a lot more material will be removed in that area before all is said and done.

1 and 5 are in one location and 3 and 7 in another. Reversed on the other side. Correct for a standard block. Should be this way.

See I leaned something today.

dthemi. Are you talking about a Gen 2 hemi block or one of your Pro Stock blocks? Are Gen 2 426 blocks not symmetrical? Intake and exhaust is. Or am I missing what you are saying?

426 blocks are not symetrical.the bore space is but the ports are not which is why you see the pushrod clearance differences cylinder to cylinder. 1 and 5 are the same 3 and 7 are the same as each other, but different from 1 and 5. Normal, but you change that often in a race motor to symetrical port location. Better to start without lifter bores in the block if you're going down that road too

DT You will have to show me next time I'm up at your shop. I still don't know what you are talking about. I am about to get in a car with a couple of the Barnetts and head for PRI. Maybe they can draw me a picture or something. If the valves and rockers are evenly spaced, which I think they are, how can the pushrods be different unless the lobe spacing is different? Barnett gets (or got) some of his his blocks without the lifter bores cut. Never asked about it. I just swept the floors and kept quiet. Later.

Sure thing stew, WB will explain it for sure. The ports on a factory 426 are not symmetrical. They're shifted over on 2 cylinders on each side. Ill see if i have a picture in my photobucket looking into the ports and you'll see the pushrod tubes are more into 2 cylinders. So same up and down, offset left and right.

This is the only pic i have that shows at least the difference in the exhaust pushrod holes in the head. Look at it close and you'll see 1st cylinder hole is same as 3rd. 2nd and 4th are same. These are stage v big valve head in factory layout.

You can see the offset also in the inner valley stud holes

DT WB not with us but Frank made me feel stupid enough when I asked him about it. " How can you have messed with Hemis since 1970 and not notice this?" "Haven't we taught you anything?" I would have walked away but we were half way between Atl and Indy and Frank was driving. Frank had fun with this. Back home now and about to go to the shop and I am going to take a CLOSE look at the heads and see what I have missed all these years. Maybe I knew this once and just forgot.

Hey Stew, I'd have ribbed them about all those perfect race cars collecting dust lol.

Also tell them a chassis man of your abilities, needen't be bothered with such trivialities as port spacing. Tell Frank to just shut up, and give you a motor, and you'll take it from there!

DT Frank would agree about the cars sitting. He has been trying to get one for us to play with. We are still working on that.
Did some measuring on 2 heads yesterday. One was an old Keith Black P4120711 head sold thru Mopar and the other is an Indy SR. Ports, rockers and lower 4 head bolts are equal spaced. Only things I found off were the push rod holes and the stud that screws into the bottom of the intake port. As you stated they are 1 and 5 same and 3 and 7 matched. I understand why the push rod holes are off due to the offset on cam lobes due to the cam bearing journals being between I guess. But can't see any reason why the studs odd spaced unless it is because the boss on the block for the stud to go thru had to be relocated for push rod clearance but the are only moved sideways about .020. wouldn't think that would take relocating the stud.
Side note. The P4120711 heads were some a buddy from KC saw on Craigslist a while back in ATL and called to get me to look at them and buy them if they looked good. Spares for a nostalgia FC he is building. I bought them and will deliver them on my next trip out west. They were metal stamped JENTZEN'S and BARNETT RACE CARS. Had to be pre 1986 I think because I think that is when Barnett left Norcross for downtown. Don't know where Buddy Jentzen went after that. Also had 1282 stamped which could be Dec 1982.
Frank asked how fast you have gone with the old 10.5 car and the PS car. I showed him the video of the flying boxcar and he loved it. Said "Now thats a ride".

I used to marvel at buddy's porting work on cast iron. He made the ports look like a cnc polisher did them.

Porting off the guide centers is a better way to go. Making them all the same.

I'm 4.78 with ye ole 10.5 car and have had a real ball playing with it. I'm adding a second kit to it this winter (or maybe a blown motor) so maybe some 60's.

I hurt the motor in my stratus testing stiff with wj, being in a rush, and not checking stuff between hits, so as soon as its back together ill go south and beat on it some more. Teens, or maybe an 0 anything is the goal .

I'm glad Frank digs the box car lol. That car has been nothing but fun. I treat it like a rolling dyno lol. I never keep the same motor in it for long. When the sun returns I'm adding a few more pounds of boost, and going for a 4.999999.

I really hope you get those guys lit up again to go racing, testing, whatever. You guys are going to love the new brainerd, and the new crossville

Any Idea what a new set of sleeves cost for a KB RB ?
I bought one a couple years back but can't remember how much it was .

$1800ish IIRC, but don't quote me but I seem to recall close to there for the block we hurt last year.

We are giving up on our mazak's at work and going with 150 horse spindle Makino's, 1200 ipm and 30K rpm. Should be coming in from Japan next month...those things are going to be loud. $34K to change a ball screw? Seems kinda high. Tim

https://www.racingjunk.com/Short-Bl...CK.html?category_id=5704&np_offset=1




if anyone is interested .

That wannabe seller is nowhere near as delirious as the crack smoking inbred who posted this ad....

https://www.racingjunk.com/Big-block-complete/183937725/440-SIAMESE-MEGA-BLOCK-ENGINE.html#11

Wow. I do love big blocks, but if things are going in that direction the Gen III hemi looks better and better.