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06-27-2003, 03:08 PM
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#1 |
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Registered User
Join Date: Feb 2003
Location: Mansfield,Tx
Posts: 54
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heads
On my 396ci. the head casting # is 3919840 as far as i know they've just been gasket matched, the intake ports are huge! After several people asking to buy them i guess they're pretty good but my question is should i keep em or get some aluminums when i put this motor im my '75 , any sugestions?
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06-27-2003, 03:17 PM
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#2 |
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Registered User
Join Date: May 2003
Location: north wilkesboro nc
Posts: 221
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these were used on 396 and 427 closed chamber heads with
rectangle ports 107 cc heads but i would say go with aftermarket if i could afford it but thats just me and it would depend on what kind of offers people making on them heads
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Scott |
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06-27-2003, 04:01 PM
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#3 |
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Oh,you can't buy that new
 
Join Date: Apr 2000
Location: Pennsville,N.J. 08070, USA
Posts: 2,042
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greg, the 840 heads are 68 era heads and are large rect port. with closed chambers .Especially on a 'smaller' motor like yours they are too much for weight it will be pushing. these heads don't come into their own until about 4500 RPM -up . They also have small combustion chambers and big blocks are fussy about high compression and todays Junk--- er-- I mean pump gas. the large oval prt heads are best suited to a performance street engine. I made 460 horse with a 396 +.030 and bone stock oval ports with closed chamber. with a .560 lift cam. and that was 20 years ago technology.
OH BTW . I would also be interested in them :-). DAVE
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"been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone  73 Pinto, stock, w/CragarSS's-eww  84,C10 SWB-Yella,stock 86 K10 SWB-Red, hopped up 305,4/S LOTS of Cummins trucks. |
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