j.j.&s.racing Posted April 13, 2014 Report Share Posted April 13, 2014 are 624 good for sport mods??and if yes or not which ons are good other than 487x Link to comment Share on other sites More sharing options...
poorboy Posted April 13, 2014 Report Share Posted April 13, 2014 They are ok I think but prone to cracking, 993 and 487 are good. Link to comment Share on other sites More sharing options...
jwmbishop Posted April 14, 2014 Report Share Posted April 14, 2014 GMPP used to counter the 624 as HP heads... with factory screw studs and guide plates. They do cut out to 2.02/1.94 cleanly. They don't flow bad and can be decked to just under 76CC - but they are thin and do crack between the exhaust seats if overheated... the 993 is the heavyweight version of the same port/chamber design. Link to comment Share on other sites More sharing options...
j.j.&s.racing Posted April 14, 2014 Author Report Share Posted April 14, 2014 Thanks guys Link to comment Share on other sites More sharing options...
BobbyJack Posted April 17, 2014 Report Share Posted April 17, 2014 I do have some 993 and 624 heads for sale Link to comment Share on other sites More sharing options...
j.j.&s.racing Posted April 17, 2014 Author Report Share Posted April 17, 2014 how much for the 993 Link to comment Share on other sites More sharing options...
Alloutpc17 Posted May 6, 2014 Report Share Posted May 6, 2014 441 are good also. Link to comment Share on other sites More sharing options...
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