Siamesed Runners v. Big Bore Runners
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Joined: Aug 2007
Posts: 1,525
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From: Milwaukee, Wisconsin
Car: 1987 IROC-Z
Engine: 383 with Edelbrock ProFlow EFI
Transmission: TH350
Axle/Gears: 12 bolt 3.73 Eaton posi
Siamesed Runners v. Big Bore Runners
What is the difference between siamesed and big bore runners? Is it where the power is at in the rpm curve? Is one better to start with than the other (as in before having and port work done)? I'm still new to all this, so any info would be good.
Mike
Mike
Joined: Jan 2005
Posts: 10,407
Likes: 492
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Siamesed Runners v. Big Bore Runners
I am running SLPs that were siamesed by me. Definately work VERY WELL for me on my 305.
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: Siamesed Runners v. Big Bore Runners
Check out the sticky post entitled "Quest for a better flowing TPI" at the top of the TPI forum. We dynoed my car with fully-siamesed SLP runners and with TPIS/AS&M large tube runners. The SLP runners made more horsepower at higher RPM, while the large tube runners made more torque. Its your choice which you want.
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