how will a ported tpi respond to 10.5:1 or 11:1
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From: chicago
Car: 87 GTA
Engine: 385 sbc
Transmission: 700r4
Axle/Gears: 2.73 posi
how will a ported tpi respond to 10.5:1 or 11:1
I have a 355 with flat tops 6cc reliefs ,decked to .015 and a set of 53cc 601s I was thinking of putting on it with my tpi set up. Any ideas how it would respond... also the cam is comp 268h-10... I know the close lsa will make for a tough chip burn but I would be sending it out to pcm4less and theyll be doing the tune.
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: how will a ported tpi respond to 10.5:1 or 11:1
Just fine as long as it does not ping. Are these iron or aluminum heads that you will be using?
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Just fine as long as it does not ping. What are the 601 heads? Iron or aluminum?
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Just fine as long as it does not ping. What are the 601 heads? Iron or aluminum?
Last edited by 1989GTATransAm; Dec 28, 2008 at 03:41 PM. Reason: Automerged Doublepost
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From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
Re: how will a ported tpi respond to 10.5:1 or 11:1
They are cast iron. I have a set on the shelf. Nice heads for a high compression small block.
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Joined: Dec 2004
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From: Rhode Island
Car: '87 S10 Blazer & '91 RS
Engine: L98 & L03
Transmission: 700R4 & T5
Axle/Gears: 10 Bolt/3.73/3.42
Re: how will a ported tpi respond to 10.5:1 or 11:1
Better get into PROM tuning. With that much compression, its gonna ping like crazy. Once it starts to ping, the ECM is gonna pull tons of timing, and then its gonna be a pig.
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Joined: Sep 2003
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: how will a ported tpi respond to 10.5:1 or 11:1
Yep, to much compression for iron heads. I would not try for more than 9.5 in your situation. If you tried for 10.1:1 you would need your ducks in a row. Couple of things for openers. You would need a tight quench, a real efficient cold air intake and a big radiator to make sure you don't go over 180 degrees. Vizard has a list of about 10 items needed to run high compression and I only covered three.
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