C4 General Discussion General C4 Corvette Discussion not covered in Tech

SLP High Flow Intake Runners

 
Old 04-12-2019, 09:19 AM
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PPicone
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Default SLP High Flow Intake Runners

Does anybody know where I can find SLP high flow intake runners for my 1988 C4 Corvette? Everywhere I look there selling for about $600. I feel that's a bit high, almost like I can jet a whole intake for that price. Any suggestions?
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Old 04-12-2019, 10:05 AM
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pologreen1
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These cars are old, and everything has been done to them. It is not worth it at all to do those mods anymore. If you want to have fun and waste money... Enjoy. SLP and the larger tubes will not get hp, not noticeable at least. the base is more important. You could waste time hogging out and"Siamesing" your stock stuff and be close to the SLP stuff.

You could look for years at threads, but all point to the same thing. What are your intentions with the car?

-If staying long tube runner intake- LPE super ram
-If want more hp and keep TQ go LT1 or short runner intake
- both would want a 3.07 gear or numerically higher (3.54, 3.73 , etc)
-Just look for used intakes and search old for sale threads. Years ago I bought a Miniram, setup with injectors, and parts shipped for 600.


Proven build that is fast for decades now roughtly 400hp maybe more:
LT! intake (modified for L98) / LPE superram / or CARB.
195 Heads
24lb injectors
Cam (GM Hot cam, or LPE 219/219 cam)
1.6rr's
1-5/8" long tube headers
Tune
3.07+ gears (if auto a 1996 S10 stall, or aftermarket stall )

Last edited by pologreen1; 04-12-2019 at 10:14 AM.
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Old 04-12-2019, 10:14 AM
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cuisinartvette
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x2. This guy posts about his frustration with those runners. Lots of hacking to improve them. If you spend enough time it can help but dont expect to feel a bunch seat of the pants.
PS $600 is rediculous. Try 2.
If it were me take a band saw, cut them in half and go to your hearts content those are a PAIN to get to where it matters. Or if you got the bux extrude hone them to death.

http://speedtalk.com/forum/viewtopic...6d6128af215567

Last edited by cuisinartvette; 04-12-2019 at 04:14 PM.
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Old 04-12-2019, 10:33 AM
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vette196
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https://www.corvetteforum.com/forums...st-design.html

These were in the for sale section
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Old 04-12-2019, 02:19 PM
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confab
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The SLP's are interesting.. The runners are shorter than stock, larger than stock. The castings are rough.

Smaller, but much shorter.. An inch shorter.. than the TPIS Runners.

Runners----------Length------Size
Stock TPI-------- 7.250"------1.470" round(1.70 sq inches)
SLP ------------- 6.625"------1.600" round (2.01 sq inches)
Accel LTR-------- 6.625"------1.615" round (2.05 sq inches)
TPiS--------------7.625"------1.660" round (2.168 sq inches)

Source: Grumpy's Performance.

Last edited by confab; 04-12-2019 at 02:34 PM.
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Old 04-12-2019, 02:21 PM
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I have a set of these and they are very rough. Kind of envisioned a flexi-ball hone as my hilljack version of an Extrude Hone job.

lol.
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Old 04-12-2019, 02:58 PM
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I want to get as much horse power as I can without doing a complete engine overhaul. Might actually do headers with a modified exhaust instead
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Old 04-12-2019, 03:16 PM
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cuisinartvette
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Get some used stuff cheap (this stuff aint in demand anymore) and port it to death, what you get is what youll have.
You can get decent tq out of them forget about hp the runner length is too long and tq is what moves a tall geared st car anyways.There are TPI cars here with unimpressive rwhp that are spanking late model vettes all day.
Leave the dyno/flow number racing to the guys glued to the internet it doesnt matter in the real world as much as youd think.

Used to be guys would run their cars, now they only type.

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Old 04-12-2019, 03:22 PM
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confab
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Originally Posted by cuisinartvette View Post
Get some used stuff cheap (this stuff aint in demand anymore) and port it to death, what you get is what youll have.
You can get decent tq out of them forget about hp the runner length is too long and tq is what moves a tall geared st car anyways.
^^^ This.

There's all kinds of intakes floating through the used section on any given day.

From Super Rams to modded LT1 intakes, reworked to fit an L98. Headers too. Amazon also has some deals on those.

Probably find anything you want from other people on the forum. That's where I got my weirdo TPI/Vortec setup, and for hundreds less than new.

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Old 04-12-2019, 03:22 PM
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I agree. Full open exhaust and some used intake stuff and the car will wake up 50-60+ hp easy.
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Old 04-12-2019, 04:17 PM
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cuisinartvette
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Unless you really need a tpi for looks or pass smog a converted LT1 intake is a quick way to big gains, dont be fooled cause they are a GM piece they are capable of moving a chit ton of air.
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Old 04-12-2019, 08:18 PM
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eutu1984
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You can still get AS&M large tube runners new just go to there website.
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Old 04-12-2019, 10:00 PM
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Y-bodluvr
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I had a set of SLP runners on my L98 GTA back in 2000 paid around $200 from Summitt now IF you can find them they’re quite a bit more I remember they felt like they added some much needed top end charge after I installed them along with a ported plenum and fuel pressure regulator

Last edited by Y-bodluvr; 04-14-2019 at 07:55 AM.
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Old 04-13-2019, 06:41 PM
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PPicone
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Default Headers

What are the best long tube headers for the money without breaking the bank?

Last edited by PPicone; 04-13-2019 at 06:42 PM.
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Old 04-14-2019, 02:05 AM
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I was able to coax 300chp from my prior 35th Anni., as shown by dyno pulls & trap speed
-open air intake w/ K&N, larger MAF, ported plenum, siamesed runners, (lightly) ported base, AFPR
-160deg T-stat & fan sw
-2 1/2" mandrel bent front Y, hi-flow cat, good cat-back
-spare & jack removed (~50lb weight reduction)
-2,000rpm TC, shift kit, shift point at 5,800rpm
-HEI ign, 50ohm/ft wires, cut-back electrodes gapped to .045"
-"frisbee" tossed
-1.6:1 pro-magnum roller rockers, stiffer springs, Ti retainers

According to TPIS it's possible to get a hi-revving L98 in the ~350chp range if you also do FL headers, cam and some head porting.
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