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440 Source heads 200-1055. I had them on my 451 for about 3000 miles. They had new valve seals put in 40 miles ago. The pushrod channels have been enlarged to fit 3/8" rods. There is absolutely nothing wrong with them. I had some extra cash laying around last fall and bought some Trick Flows to put on this motor. $600 for the pair picked up in west central WI, 100 miles straight east of the Twin Cities. Set of head bolts, pretty sure they are from 440 Source as well $40.00. Couple more items that were on this motor. A set of ball/cup pushrods that I believe are Manley. This was a hft cam with Hardland Sharpe rockers, they measure between 8.302-8.307 end to end, $75.
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