Jim409_Pontiac and I just got back from Detroit.
We picked up a set of Z-11 heads and a block assembly.
The block and heads are freshly rebuilt and everything looks good.
The block has been decked so there's no stamping but the date codes for the block and heads are all within five days of each other. It's got Eagle H beam rods and a Z-11 spec cam. It's also got the 3.65 stroke Z-11 crank.
There's no intake or valley pan and there's no Z-11 oil pan or valve covers.
The only issue I see so far is that the stock 2.10/1.72 valves have been replaced with something like 2.25/1.88 (I'll check tomorrow)
They're good Manley stainless valves and I don't mind the little bigger intake but I wish they wouldn't have gone out to 1.88 on the exhaust.
I stopped by our engine guys shop on the way home and got him to look at the heads. They have been mildly ported by somebody that knew what they were doing (maybe years ago) but the transition to the new valve job needs work, especially on the exhaust.
He put them on his bench and the intake flowed 332 @.700 343 @ .800 which is pretty good but he said they should pick up a fair bit with just smoothing the transition to the valve seat.
The exhaust were really bad, only 217 @ .700
For comparison, our aluminum Bob Walla heads flow 286 @.700 with a smaller 1.75" valve.
Again, the exhaust ports look good but there is a bad step where the valve job ends.
Of course, we have no intention of hogging these heads out to max out the flow but we will let our engine guy carefully smooth out the transition.
I'll get more pictures tomorrow but I did get this one of the head on the flow bench...
We picked up a set of Z-11 heads and a block assembly.
The block and heads are freshly rebuilt and everything looks good.
The block has been decked so there's no stamping but the date codes for the block and heads are all within five days of each other. It's got Eagle H beam rods and a Z-11 spec cam. It's also got the 3.65 stroke Z-11 crank.
There's no intake or valley pan and there's no Z-11 oil pan or valve covers.
The only issue I see so far is that the stock 2.10/1.72 valves have been replaced with something like 2.25/1.88 (I'll check tomorrow)
They're good Manley stainless valves and I don't mind the little bigger intake but I wish they wouldn't have gone out to 1.88 on the exhaust.
I stopped by our engine guys shop on the way home and got him to look at the heads. They have been mildly ported by somebody that knew what they were doing (maybe years ago) but the transition to the new valve job needs work, especially on the exhaust.
He put them on his bench and the intake flowed 332 @.700 343 @ .800 which is pretty good but he said they should pick up a fair bit with just smoothing the transition to the valve seat.
The exhaust were really bad, only 217 @ .700
For comparison, our aluminum Bob Walla heads flow 286 @.700 with a smaller 1.75" valve.
Again, the exhaust ports look good but there is a bad step where the valve job ends.
Of course, we have no intention of hogging these heads out to max out the flow but we will let our engine guy carefully smooth out the transition.
I'll get more pictures tomorrow but I did get this one of the head on the flow bench...