Check out someone’s work before sending him your heads
- Thread starter pittsburghracer
- Start date
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j par
Well-Known Member
Looks more like a wood carver... Hammer and chisel style....
Yaaa I was about speechless so I shut my damn mouth and moved on.
I had a reputable machinist/race car builder and owner/driver do a set of big block heads for me. On one head, all 4 exhaust valves - be it seats or valve guides were at the wrong angle. You could see light through them half way around the valve. It took me several hours at home to fix it. Never went back.......
PRH
Well-Known Member
In the 30 years I’ve been doing this stuff for my job, I have had plenty of pretty ugly stuff come through the shop.
The flow bench doesn’t care if it’s pretty or not....... and, while it doesn’t happen very often........ some of that really crude ugly stuff actually works okay(and sometimes the really pretty stuff doesn’t).
As for the pics John posted....... I’m gonna say 270cfm seems like it would be a big stretch.
Looks like a hole or something in the lower right corner of the ex port?
I have a set of heads here now that someone sent me that they bought, and said they were really nice and that I’d be impressed by the work.
As it turns out.......Uuuummm....... not so much.
Got a link to that Facebook page?
The flow bench doesn’t care if it’s pretty or not....... and, while it doesn’t happen very often........ some of that really crude ugly stuff actually works okay(and sometimes the really pretty stuff doesn’t).
As for the pics John posted....... I’m gonna say 270cfm seems like it would be a big stretch.
Looks like a hole or something in the lower right corner of the ex port?
I have a set of heads here now that someone sent me that they bought, and said they were really nice and that I’d be impressed by the work.
As it turns out.......Uuuummm....... not so much.
Got a link to that Facebook page?
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PRH
Well-Known Member
Thanks John.
I’m never on facebook, so there’s probably something I’m missing....... but I scrolled down what I thought was pretty far, and didn’t come across those pics.
I don’t have a Facebook account so maybe I don’t get to see “everything”.
I’m never on facebook, so there’s probably something I’m missing....... but I scrolled down what I thought was pretty far, and didn’t come across those pics.
I don’t have a Facebook account so maybe I don’t get to see “everything”.
You can join and keep your friend count low just for the ability to see and join groups. There is a lot of good reading on there. And a lot of good places to sell parts. What I like is you can write up one ad and post it in almost every group you belong to. Just by clicking a button.
PRH
Well-Known Member
Looking at the first pic a little closer, it has the long intake guide boss, so it’s either a 915 or 906.
With both of those heads, my experience has been that the SSR is the make-or-break area to address for good air flow.
It wouldn’t surprise me if that port didn’t flow any more than a stock port after the port noses over from not having the SSR right........ which can often happen(and usually does) in the .450-.550 lift area.
As is also quite typical with novice porters doing BBM heads....... the ex ports get opened up way too much.
With both of those heads, my experience has been that the SSR is the make-or-break area to address for good air flow.
It wouldn’t surprise me if that port didn’t flow any more than a stock port after the port noses over from not having the SSR right........ which can often happen(and usually does) in the .450-.550 lift area.
As is also quite typical with novice porters doing BBM heads....... the ex ports get opened up way too much.
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