![]() ![]() Shortly thereafter, Pro Topline is Out of Business !! They wanted my $10,000 Buy-In to be a direct distributer badly but i felt there was little to gain in the real performance industry with these stock replacement heads. The only plus would be the better metal content as an asset to help against constant head cracking with the stock magnum heads. I still have their old catalog sitting here on the table.Īlthough flow rates were said to be improved, they were still comparable to factory Magnum heads and not considered a true performance head by any standard. I actually spoke to them about the heads at SEMA to learn they had upgrade thicker deck surfaces and slightly improved nickel content compared to stock 5.2 and 5.9 heads. Pro Topline in Austrailia originated the HD heads back in 2002. Be careful, those jokers telling you HD heads flow better than RT heads leave alot to be desired.
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