71monteme Posted January 10, 2009 Share Posted January 10, 2009 i have a chance to get a pair of aluminum heads from a zz572 bbc engine for a great price. can you guys and gals tell me if these heads will fit on a mark IV block? thanks thanh. Link to comment Share on other sites More sharing options...
Sam (Bones) Posted January 10, 2009 Share Posted January 10, 2009 here's the specs Bowtie 572/620 Cylinder Head Assembly MSRP $1,415.71 Buy Bowtie 572/620 Cylinder Head Assembly Enlarge image [+] 12499255 Bowtie 572/620 Cylinder Head Assembly Aluminum head assembly Used in the 572/620 GMPP crate engine Completely assembled with 2.25/1.88 11/32 stem valves Valve springs for hydraulic roller cams for up to .632 lift 310cc rectangular intake port 118cc exhaust port raised 5/8 118cc combustion chamber Not recommended for engines smaller than 572 cid This head is assembled with the following components: 12366987 2.25 Intake Valves 12366990 Valve Spring Retainers 88963128 Exhaust Valves 12366992 Valve Locks 88963934 Valve Springs 88963936 Valve Seals 88963937 Valve Spring Shims 3921912 Rocker Arm Studs 88963935 Valve Spring Locators 3860038 Pushrod Guideplates and this is the 720hp head Bowtie 572/720R Cylinder Head Assembly MSRP $1,465.71 Buy Bowtie 572/720R Cylinder Head Assembly Enlarge image [+] 88961160 Bowtie 572/720R Cylinder Head Assembly Aluminum racing head assembly Used in the 572/720R GM Performance Parts Completely assembled with 2.25/1.88 11/32 stem valves Mechanical roller valve springs not for use with hydraulic roller cams Good to .720 valve lift 310cc rectangular intake port 118cc exhaust port raised 5/8 118cc combustion chamber Not recommended for engines smaller than 572 cid This head is assembled with the following components: 12366987 2.25 Intake Valves 12366990 Valve Spring Retainers 88963128 Exhaust Valves 12366992 Valve Locks 88963933 Valve Springs 88963936 Valve Seals 88963937 Valve Spring Shims 3921912 Rocker Arm Studs 88963935 Valve Spring Locators 3860038 Pushrod Guideplates Link to comment Share on other sites More sharing options...
71monteme Posted January 10, 2009 Author Share Posted January 10, 2009 thanks guys. i knew you guys would get me in the right direction. bones- where did you get the spec and Msrp? allen- yes it would be a nice treat but i might have a 565 rhyes- morrison @ 1000hp going into the monte for a few runs before we trade it in for another 565@ 1400hp . i'll find out what is the weakest link in the car thanh Link to comment Share on other sites More sharing options...
Sam (Bones) Posted January 10, 2009 Share Posted January 10, 2009 the intake runners are only 310cc's, that's what my heads are, then why does the 454HO use a head with 325cc intake runner? Link to comment Share on other sites More sharing options...
680HPStroker Posted January 12, 2009 Share Posted January 12, 2009 I'm once again in agreement here with Allan. For my money I'll stay with AFR for the rest of my life. My 315's on my 489 work like a charm. If I ever step up to real big league displacement AFR has either a set of 335, or 355 CNC heads that will definitely do the trick. Link to comment Share on other sites More sharing options...
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