TPI Question (Size of Runners On Heads)? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JRB · 05-05-2006, 10:40 PM

Is there a certain size runner you need on your heads when you are running TPI?
Thanks,
JRB

rauto13 · 05-05-2006, 11:01 PM

I wouldn't think so, I have seen a TPI on all different Chevy engines. I would think that the runner length on the head would just shift the torgue & horsepower peaks in the curve. More low end, less top end with long runners & vice versa with short runners.

If I remeber correctly.

**Richard** · 05-06-2006, 01:51 AM

Street an Performance makes a large runner setup for the TPI. They also have a manifold that will fit the TPI to the Fast Burn style heads. From what I have read it seems to be understood the Chevy TPI poops out at under 400hp. I am going to have the large runner setup and extrude hone the entire intake assembly for the 420hp 383 crate motor.

05-05-2006, 10:40 PM	#1
JRB Senior Member Join Date: Nov 2005 Location: Portland Oregon Posts: 287	TPI Question (Size of Runners On Heads)? Is there a certain size runner you need on your heads when you are running TPI? Thanks, JRB

05-05-2006, 11:01 PM	#2
rauto13 saving one more Join Date: Sep 2005 Location: Pryor Creek, Oklahoma Posts: 3,066	Re: TPI Question (Size of Runners On Heads)? I wouldn't think so, I have seen a TPI on all different Chevy engines. I would think that the runner length on the head would just shift the torgue & horsepower peaks in the curve. More low end, less top end with long runners & vice versa with short runners. If I remeber correctly. __________________ 72 Chevy longbed - now for parts 69 Chevy short fleet - needing some love 70 RS Camaro - needing more love driver - 96 GMC X-cab

05-06-2006, 01:51 AM	#3
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,786	Re: TPI Question (Size of Runners On Heads)? Street an Performance makes a large runner setup for the TPI. They also have a manifold that will fit the TPI to the Fast Burn style heads. From what I have read it seems to be understood the Chevy TPI poops out at under 400hp. I am going to have the large runner setup and extrude hone the entire intake assembly for the 420hp 383 crate motor. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746



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