FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
|
Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
Reply |
|
Thread Tools | Display Modes |
|
#1
|
|||
|
|||
Iron vs aluminum heads
Ok I have a set of max ported 6x -4 heads on my turbo 455 motor roughly 9.5 to 1 compression would I see any gains / benefits by going to a max ported aluminum D port head , besides the xtra compression ? Also are the size of aluminum heads exactly the same size as iron heads , because I am very tight with my log manifold to the frame now ..and all my hot air crossover pipes were mocked up with the iron heads . Thanks
|
#2
|
||||
|
||||
Dimensionally the heads are the same so no issues there.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#3
|
|||
|
|||
Thanks B man
|
#4
|
|||
|
|||
You currently run your setup on E85, is that correct?
With conservative levels of boost, I think raising the compression slightly may be beneficial as part of a change to an aluminum D port. As far as a max effort port goes, hopefully somebody more knowledgeable will chime in. My understanding is that you're changing the pressure ratios slightly. The better ports on the aftermarket head would theoretically create a situation where 10 lbs of boost is actually more airflow, which would create more power. Richard Holdener has been able to prove pretty positively that the higher base hp your engine makes normally aspirated, the more power you'll make at given boost pressures, with 1 bar being roughly equivalent to a doubling of power. A true 310cfm port D headed 455 should make 550hp without too much trouble. 14.7psi should theoretically get you to around 1100 assuming the turbo sizing can offer enough flor to support that power level.
__________________
-Jason 1969 Pontiac Firebird |
#5
|
|||
|
|||
Quote:
It's all a matter of tune and how far u want to push it. Race only....push it! |
#6
|
|||
|
|||
As far as aluminum aftermarket heads, they will flow better out the box with room to grow...
|
#7
|
|||
|
|||
Thanks guys , the only reason for charging heads is that my max ported iron 6x heads are leaking water somewhere as I am losing water from my radiator and there is no water in the oil . I see water or condensation from the exhaust but it’s deceiving because I run E 85 and it attracts water , so I think I must have a pin hole leak in the intake or exhaust port somewhere . It does not effect how the motor runs but it bothers me so although it’s a lot of work I have to pull the heads and see if they can be epoxy repaired or buy aluminium ,,,, are edelbrock D port still the favorite or Kre ?
|
#8
|
|||
|
|||
Quote:
You will have more cylinder pressure than cooling pressure.. cooling systems are only around 13-15psi... any oil in the water? |
#9
|
|||
|
|||
Quote:
|
#10
|
|||
|
|||
Quote:
|
The Following User Says Thank You to ponchonlefty For This Useful Post: | ||
#11
|
|||
|
|||
Either will do but I think the KRE is a bit better from what I have seen... you don't know how much it pains me to say that though as I dislike KRE...lol
|
#12
|
||||
|
||||
I have a good idea how much, I remember all that crap way back!! I took a good hit as well$$$
__________________
LIFT HEAVY, LIFE IS TOO SHORT TO BE SMALL! |
#13
|
|||
|
|||
I’ve been happy with my KRE D ports.
That said the first thing you might try is a cooling system sealer. You can get the AC Delco tablets that GM uses for about 5 bucks If it’s a casting porosity issue, that might be a quick, cheap fix.
__________________
-Jason 1969 Pontiac Firebird |
#14
|
|||
|
|||
Cool I will give them a try. , thanks
|
#15
|
|||
|
|||
Also could water be escaping the head gaskets somewhere ? I am running the cometic gaskets ..
|
#16
|
|||
|
|||
are you running antifreeze?do you have a over flow on it?if your running antifreeze and its steaming from the exhaust you can smell it. if compression is leaking in the coolant system. it would build pressure in the radiator and push past the cap. hope this helps. good luck
|
#17
|
|||
|
|||
Quote:
|
#18
|
|||
|
|||
Have you checked your plugs as well? If you're washing water through the combustion process, you'll steam clean the cylinders effected. The plugs will look incredibly clean when you pull them out. If you pull them and you have one or two that are clean compared to the others, look for the possible issue there.
__________________
-Jason 1969 Pontiac Firebird |
#19
|
|||
|
|||
Also on the aluminum d ports do they have issues with exhaust header mounting threads stripping out ?
|
#20
|
|||
|
|||
I haven't had any trouble with mine. I don't have a bunch of hot side tubing hanging off of them though either.
__________________
-Jason 1969 Pontiac Firebird |
Reply |
|
|