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Im not and have never been a fan of the Source stuff. With the increasing numbers of cracked Source heads, Eddys or the MP 452 heads are the only way Id go. Plus the Eddys/452s flow a little more than the Source heads, un ported.

Basically the hardware with the Source heads is useless with any cam..............not mention my experience with a few of their other parts.



I emailed 440source and they sent me the updated version of the their valve locks/retainers, for free I had to pay a couple dollars for shipping. They do just fine with my lunati 60303 cam. If you want to run any serious cam, you will be replacing the stock hardware with on 440source heads. If you want to run any serious cam, you will also be replacing stock hardware on eddy rpm heads.

As for flow #'s right OOTB, here's an eddy rpm vs 440source flow test done several years back by moparts member fast68plymouth soon after the source heads hit the market. At higher lifts the eddys do flow about 3% better than the source heads and at the very low lifts the source heads flow a hair better.

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4.375 bore, 28" test pressure, radius plate on intake, no tube on exhaust:

average flow for #5 and #7 cylinder

lift----I/E
.100--63.8/49.0
.200-140.5/104.1
.300-207.8/139.7
.400-239.2/164.6
.450-248.1/172.5
.500-256.1/177.8
.550-261.5/182.6
.600-265.3/188.2
.650-267.3/191.5
.700-267.3/195.8

here is an OOTB E head i tested recently, also the average for a left and right cylinder:

lift----I/E
.100--66.1/50.8
.200-138.3/105.4
.300-203.8/140.5
.400-243.1/163.6
.450-258.0/170.4
.500-265.7/178.6
.550-272.3/185.3
.600-276.5/190.3
.650-276.1/194.6
.700-275.7/197.3



I've read chrisf's issues with the 440source heads before and that is really crazy what happened to his heads. I was on the waiting list for source heads and got mine when they first came out, however they sat on the shelf for years and I'm about to take them off my 440 for a motor rebuild but haven't put much miles on the source heads.