j par
Well-hung Member
I'll have to measure mine with a yardstick!!...
ProComp/Speedmaster aluminum heads
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j par
Well-hung Member
Also as I understand it the CNC porting only goes so far in? It's not inside the bowl area or anything like that? Is the bowl area CNC'ed as well?...
Yes the bowls are totally done
j par
Well-hung Member
Did they come that way from Speedmaster?...
Yes
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The intake ports are 190cc on the CNCed heads. 170cc on the non CNCed. Kim
Quite a bit of non-clean up. But they do look nice!
yellow rose
Overnight Sensation
What size valve is in the CNC head? Is it the same size as the in ported head?
TIA
TIA
j par
Well-hung Member
Yup...
I’m not sure, my heads are bare. Maybe 89on35s will chime in again. He has a set he got from me. Kim
j par
Well-hung Member
Same head. I think they offered a competition valve grind, but I don't remember seeing bigger valves...
yellow rose
Overnight Sensation
j par
Well-hung Member
Jason, The heads we have came from the same speed shop. Both sets CNCed. His heads are complete. I believe he posted a page back or so when u asked for measurements. Kim
j par
Well-hung Member
I'm wondering is that CC's? It's say my unported are 170 and the ported are 190? Does that mean like cc'ing the head like cc'ing the chamber?
yellow rose
Overnight Sensation
j par
Well-hung Member
I'll be curious to have both sets of heads on the bench this winter for comparison...
Jason, If u had both sets to compare I think u would be wondering why u didn’t splurge for the CNCed ones. Kim
I was kinda shocked to see how much grinding you have to do to get 21cc out of a head. I’m not big on pouring a runner because honestly I don’t reslly care but curiously got the best of me so I poured a runner on my best set of Edelbrock heads that hit 318cfm with a 2.08 valve and I was right at 191cc. The old Doctor J heads claimed to be 220cc with the OLD company that made Speedmaster heads after he had them made without water in the floor. I honestly don’t think you could get 220 or anywhere near there without pushing the pushrod WAY over to gain area.
I would guess my mag heads, with my touch ups, would have 180 cc on the intake side.
I guess I should explain my guess... LOL ^^^^ EQ heads flow 172 cc, which would be a tad better than a factory mag? I figured my "touch up" would have me a smidge better than them?? I hope?? LOL.... So I would think I'm at the very least as good as the EQ, but I hope a "smidge" better.
The CNC heads I have are 2.02/1.60 valves.
Cley
Cley
yellow rose
Overnight Sensation
LOL especially 21 CC's of nasty cast iron. I did pour m heads and IIRC they were 179 CC's. And I hated every second of it.
j par
Well-hung Member
Like I was saying last night, I'm not sure where they're getting the material to take off? When I felt them they felt very Hollow and then the sound when I tap down on them or anything there was definitely a very Hollow feeling...
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