Originally posted by DanStokes
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Alex Denysenko of http://moneymakerracing.net/ was the one responsible for these heads in the beginning. He was marketing them as a good performing street head and nothing else. They were basically a copy of the GT40X head. He had the foundry in Australia who cast aluminum parts for Ford in Australia. Since he was a little fish in a big pond he was having marketing problems in getting enough sales to meet foundry casting quotas. I'm assuming they probably have changed hands a few times so I can't comment on quality. I second what Dan thinks that the casting are OK but who knows on the rest? Do you want to ruin a new motor on a dropped valve? On the Mustang forum I hang out on there is a guy who had exactly this happen but it was with Trick Flow 170 heads.
May I make a suggestion? If you haven't bought pistons or have the crank cut, turn it into a 302. In the long run it may be cheaper. There were a lot more 302's made then 289's. You might be able to get a complete 302 rotating assembly cheaper then a 289 set up. Another plus with the added cubes, it'll be easier to maintain CR since most aftermarket sbf heads are geared toward about 9:1 with a 65 CC chamber typically.
The GT40P head is actually a pretty good head. They need only about 28* total timing. Headers are as bad as you think. I'm going to be using them on a 302 that's going into my 66. These are standard off the shelf MAC long tube headers.
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