Gsl-Se Center Iron vs. 12a Center

Rogue_Wulff · 11-21-2008, 03:34 PM

Yeah, I am aware that the stock 12A primary ports are larger than what can be achieved on a 6 port center iron. Simply swapping the center iron for a 4 port, on an otherwise stock 6 port, gives the same benefits as porting, but even more than what can be got from porting the 6 port center.
With a moderate to large SP on the 4 port center, and the limited porting available on the 6 port end irons, combined with exhaust porting, one *should* be able to make even more power than a "Monster SP" on a 4 port, since the secondary ports of a 4 port cannot achieve the size of the 6 port.
This is my plan, should I ever open up my SE 6 port. I already have a RB holley style intake for the 6 port, so I will use it on the "Hybrid" 6 port. To convert to a 4 port 13B would require the purchase of a different intake, and I'd rather not have to do that. The 4 bbl carb also helps the idle quality on a 6 port, since the aux ports have the sleeves removed to use this style intake. With a big 2 bbl, it is idling off both the primary and secondary ports, but with the 4 bbl, only the primary ports are utilized at idle, unless the intake has been modified or an open spacer is used.

I'm just curious as to what kind of power is realisticly achievable thru the "Hybrid" 6 port, using a 4 port center iron, along with moderate porting. By moderate, I mean something still street freindly, that really comes alive when the loud pedal is depressed....
Of course, the stock 6 port with the RB intake and 600 edelbrock is already a HUGE improvement over my SP (mild) 12A with stock intake/carb.
BTW, I also have a 650 Holley DP for the 13B, but haven't tried it yet. I might even go blow-thru, once I have the "Hybrid" 6 port built and broken in.

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11-21-2008, 03:34 PM	#17
Rogue_Wulff Non Member Join Date: Jun 2008 Posts: 310 Rep Power: 18	Yeah, I am aware that the stock 12A primary ports are larger than what can be achieved on a 6 port center iron. Simply swapping the center iron for a 4 port, on an otherwise stock 6 port, gives the same benefits as porting, but even more than what can be got from porting the 6 port center. With a moderate to large SP on the 4 port center, and the limited porting available on the 6 port end irons, combined with exhaust porting, one should be able to make even more power than a "Monster SP" on a 4 port, since the secondary ports of a 4 port cannot achieve the size of the 6 port. This is my plan, should I ever open up my SE 6 port. I already have a RB holley style intake for the 6 port, so I will use it on the "Hybrid" 6 port. To convert to a 4 port 13B would require the purchase of a different intake, and I'd rather not have to do that. The 4 bbl carb also helps the idle quality on a 6 port, since the aux ports have the sleeves removed to use this style intake. With a big 2 bbl, it is idling off both the primary and secondary ports, but with the 4 bbl, only the primary ports are utilized at idle, unless the intake has been modified or an open spacer is used. I'm just curious as to what kind of power is realisticly achievable thru the "Hybrid" 6 port, using a 4 port center iron, along with moderate porting. By moderate, I mean something still street freindly, that really comes alive when the loud pedal is depressed.... Of course, the stock 6 port with the RB intake and 600 edelbrock is already a HUGE improvement over my SP (mild) 12A with stock intake/carb. BTW, I also have a 650 Holley DP for the 13B, but haven't tried it yet. I might even go blow-thru, once I have the "Hybrid" 6 port built and broken in.