C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Yet another Runner question...

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Old May 7, 2003 | 10:45 AM
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Default Yet another Runner question...

So the consensus is to save your $$$ for that barely used SR out there- but what if you'd rather spend a 3rd of that and get some runners (please no debate on the SR, as it's not what I'm after just yet)?

SLP compared to edelbrock (and lastly AS&M due to the price). Already have a hi-flow base & gutted plenum, so which set of runners are the best flowing?

I've heard good things about each, so please speak up.

:cheers:
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Old May 7, 2003 | 12:14 PM
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Default Re: Yet another Runner question... (Ramanstud)

I have a set of ASM runners that I have yet to install so I really can't speak from personal experience yet, but if you a search on LTRs you'll see that most seem to think that the ASM units flow the best. That's why I got them :yesnod:
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Old May 7, 2003 | 12:39 PM
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Default Re: Yet another Runner question... (Ramanstud)

The edeljunks are just as big as the AS&Ms, but the walls are thicker which leads to fitting problems.

IMO, don't spend money on a TPI type design. A ported stock unit flows almost as well as ported aftermarket units. Runner cross-section is not the limiting factor in the TPIs case.


[Modified by Aaron's 87, 12:40 PM 5/7/2003]
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Old May 7, 2003 | 12:45 PM
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Default Re: Yet another Runner question... (Aaron's 87)

The edeljunks are just as big as the AS&Ms, but the walls are thicker which leads to fitting problems.

IMO, don't spend money on a TPI type design. A ported stock unit flows almost as well as ported aftermarket units. Runner cross-section is not the limiting factor in the TPIs case.
[Modified by Aaron's 87, 12:40 PM 5/7/2003]
What is? Already have a hi flow aftermarket base (aka bigmouth/edelbrock), hogged out plenum, etc. Only thing left stock is the 48mm TB and runners. I'm not going to upgrade the TB yet, but was contemplating runners if I found a cheap pair. This is NOT a stock motor, and I feel the TPI's characteristics will be best suited to my intentions- soooo.... which set?
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Old May 7, 2003 | 12:54 PM
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Default Re: Yet another Runner question... (Ramanstud)

I am happy with the AS&M runners that I have on my 383. I haven't tried the others, but it is generally felt that the AS&M are the best of the long tubes.
:cheers:
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Old May 7, 2003 | 01:03 PM
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Default Re: Yet another Runner question... (Hole-Shot)

WShen I installed my LPE/Accel runners I had no fitment problems whatsoever.
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Old May 7, 2003 | 01:05 PM
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Default Re: Yet another Runner question... (Hole-Shot)

I am not going to debate which ones are better but I will say this. AS&M runners have an inside diameter of 1.68 inch. The Edelbrock runners have an inside diameter of 1.72. I have the entire Edelbrock setup and have no fitting problems other then the base intake hits the valve covers and you have to trim the covers a little. No big deal.
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Old May 7, 2003 | 01:11 PM
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Default Re: Yet another Runner question... (Phobos84)

I think my product review on the Edelbrock stuff listed most of my fit problems. There were a few. The worst was having to seriously grind on the runner that goes to #8 to get the injector not to bind on it. IMO, the TPI has too many airflow direction changes and not enough plenum. The runners could be a couple inches shorter too. I don't know which is 'best', but my opinion is not to dump too much money into that type of setup. Correctly port the stock stuff and you won't find a much better flowing LTR type setup.
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Old May 7, 2003 | 01:18 PM
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Default Re: Yet another Runner question... (Ramanstud)

I don't know which is higher flowing either but the AS&M are a nice quality piece.

Ask Vic'89 what his gains were when he installed the AS&Ms after his BM base & ported plenum. I think trap speed showed about a 15hp gain or so.

If you have an A4 you may want to also increase your WOT shift points to take advantage of better breathing up top.
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Old May 7, 2003 | 01:54 PM
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Default Re: Yet another Runner question... (Phobos84)

I am not going to debate which ones are better but I will say this. AS&M runners have an inside diameter of 1.68 inch. The Edelbrock runners have an inside diameter of 1.72. I have the entire Edelbrock setup and have no fitting problems other then the base intake hits the valve covers and you have to trim the covers a little. No big deal.
I appreciate the no-BS approach, and especially the inner diameter measurements. Any comparisons to the SLPs (they're easily $100 cheaper)? Although hedging valve covers is easy work with a bench grinder, I hate to think that for $350 new you'd still have to mod them for a "stock" replacement!

IMO, the TPI has too many airflow direction changes and not enough plenum. The runners could be a couple inches shorter too.
Ya know... you could just substitute in "Superram" there and save yourself some typing! :jester


[Modified by Ramanstud, 1:56 PM 5/7/2003]
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Old May 7, 2003 | 03:01 PM
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Default Re: Yet another Runner question... (Ramanstud)

I've got the TPIS runners on the Vette and SLP runners on the IROC. If all you want to do is bolt them on and forget about it, then the SLP runners probably aren't the best choice. If you're willing to work for your horsepower, then I think the SLP runners are great. I spent a couple hours gasket matching them, which they badly need. You also need to open up the plenum for the SLP runners. The SLP runners also have a TON of extra material, so you can really go to town porting them. If I ever get my other 5,000 problems worked out, I want to siamese the runners beyond the 1.5" they are siamesed stock. This will shorten the effective runner length, and should help move the power band up a little.
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