I just had a set of bare Dart Pro-1 SBC heads delivered from a local dealer. They're the pre-Platinum design with 215cc runners, 64cc chambers and 2.05" intake and 1.60" exhaust.
On unboxing and visually inspecting the castings, I've noticed quite a few issues, which I'm not sure are a problem or not. I'd appreciate input from anyone who is familiar with Dart heads (or new name brand aftermarket heads in general).
The issues I noted are as follows:
1) Valve guides are not all pressed into the castings by a uniform amount... some guides extend into the ports by a small amount, while others do not.
2) There is a green residue around a couple of the guides. Not sure what this is.
3) There is a hand-done etching on one of the castings... not an issue, per se, but what is this for?
4) The transition from the machined area under the seat to the cast area of the bowl is rather abrupt. Is this normal for 'as cast' heads?
5) I was a little surprised at the amount of casting flash around the ports. Again, is thie normal for 'as cast' heads?
6) The sealing face of each casting has some kind of patina on it... not sure if this will simply clean-off (haven't tried yet). Is this normal?
7) Would there be any tangible benefit from addressing points 4 and 5 with a grinder?
I've attached pics below to illustrate all the above points:
Thanks.
On unboxing and visually inspecting the castings, I've noticed quite a few issues, which I'm not sure are a problem or not. I'd appreciate input from anyone who is familiar with Dart heads (or new name brand aftermarket heads in general).
The issues I noted are as follows:
1) Valve guides are not all pressed into the castings by a uniform amount... some guides extend into the ports by a small amount, while others do not.
2) There is a green residue around a couple of the guides. Not sure what this is.
3) There is a hand-done etching on one of the castings... not an issue, per se, but what is this for?
4) The transition from the machined area under the seat to the cast area of the bowl is rather abrupt. Is this normal for 'as cast' heads?
5) I was a little surprised at the amount of casting flash around the ports. Again, is thie normal for 'as cast' heads?
6) The sealing face of each casting has some kind of patina on it... not sure if this will simply clean-off (haven't tried yet). Is this normal?
7) Would there be any tangible benefit from addressing points 4 and 5 with a grinder?
I've attached pics below to illustrate all the above points:
Thanks.