| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
08-01-2002, 08:07 PM
|
|||
|
|||
Just found a set of 62 casting heads in a bone yard date code jan.17 69.What i would like to know is how the heads flow on a 400 block and what will the cr be on a .030 over 400 with .o49 thick head gasket.mrw
|
|
#2
08-01-2002, 08:07 PM
|
|||
|
|||
|
Just found a set of 62 casting heads in a bone yard date code jan.17 69.What i would like to know is how the heads flow on a 400 block and what will the cr be on a .030 over 400 with .o49 thick head gasket.mrw
|
|
#3
08-01-2002, 08:42 PM
|
||||
|
||||
|
They flow well.
Assuming a combustion chamber volume of around 72cc and a 0 deck height, CR will be around 10.25:1.
__________________
Just a blind squirrel looking for a nut. |
|
#4
08-01-2002, 08:45 PM
|
|||
|
|||
|
i think they are like 10.25:1 compression on a 400, i run them on my 455 with sunk top pistons, from what i understand all the d-ports run pretty close on the flow #'s but i'm sure someone will know alittle more about them than i know
i know they are good 4 barrel heads with 2.11 1.77's and have screwing studs and work will on my motor with a little home porting! [ August 01, 2002, 08:52 PM: Message edited by: 78lemans ] |
|
#5
08-01-2002, 11:53 PM
|
||||
|
||||
|
My 62s cc'd 75cc and others have posted the same so use that in you calculations. They are a pretty decent flowing D port head.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
|
#6
08-05-2002, 07:59 PM
|
|||
|
|||
|
My 400 is bored 60 over and I have the 75cc 62 heads from a 428 I believe. the CR calced out to about 9.5 to 1. Runs great on 93 or 94 octane pump gas.
|
|
#7
08-05-2002, 10:20 PM
|
||||
|
||||
|
A +.060 400 with 75cc heads will be at least 10.2 comp.
[ August 05, 2002, 10:21 PM: Message edited by: David Holmberg ] |
|
#8
08-05-2002, 10:58 PM
|
||||
|
||||
|
"A +.060 400 with 75cc heads will be at least 10.2 comp."
Depending on deck height and gasket thickness it could be less. |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
