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Like pinto, Volvo heads are similar, the later injection head is much better than the earlier castings. Aside porting and chamber modifications, some heads had inherent faults when modified extremely, a lotus head for example suffers from a lack of valve spring height . . .restricting valve lift . . .if you bore the head to help, you encroach into the inlet port, especially if the ports are large. Another way is to use longer valves. . . Which causes other problems
I know a little about 289 heads, 380-420ish BHP seems to be the range for a top spec fia engine using 55 year old heads. I've not had my mitts on a new head, but I know it would be very easy to improve them, and I have it on good authority the new one have been. Which frankly ain't fair.
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