no at this time Im no longer building those custom intakes plenums.
C4 Larger Intake Runners L98 TPI Hi guys, I'm new to the forum have had my 85 Greenwood Corvette for five years and have started to look for more power, was thinking of upgrading the inlet runners in between the intake manifold and the plenumn, i believe there is a larger set available, was...
garage.grumpysperformance.com
I get this question frequently so let me point out a few things http://garage.grumpysperformance.com/index.php?threads/relocating-the-mat-manifold-air-temp-sensor.10349/#post-42530...
garage.grumpysperformance.com
I got asked if building a 383 rather than just rebuilding the current 350 would kill a corvettes mileage, well having done that several times and having done it with both the earlier carb equipped c3 and later TPI corvettes plus several cross fire and efi custom configurations,I can say that...
garage.grumpysperformance.com
Good morning, Grumpy. I have come across your name and posts in various Vette forums when looking for tuned port injection information. Here's my story.....I have a 69 Camaro with a 355 (started as 10.25:1, 300 hp 350 out of '70 Nova. flat top pistons with 4 valve reliefs) 041 pocket ported...
garage.grumpysperformance.com
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it was costing me more to make those than I was charging and it seemed like a good many people,
had no idea how too, nor cared to bother too,
modify the base to gain the full potential they offered,
you could easily gain 40 -90 plus hp over the stock TPI intake with the modified plenum,
a bit of porting on the lower stealthram runners like the linked photo shows and a mild cam upgrade
and swapping to better heads with 1.6:1 roller rocker and larger injectors, it was very common to get even better results on a 383-406 , with about 10:1 compression was used, if a 3200 stall converter and a hydraulic roller cam like a crane 119661 or a crower 00471 was used (heads like AFR 195cc or the BRODIX IK 200 cc work well)
thus most people were not getting anywhere near the full power/air flow potential the moded plenum provided,
without matching mods that used the full air flow rates potentially available
INSTALL ALL YOUR SENSORS AND AIR LINE CONNECTOR FITTING ON THE PLENUM,
AND THROTTLE BODY BEFORE YOU INSTALL PLENUM WITH NEW GASKETS
PORTING THE LOWER RUNNER SECTION AS IN THE PICTURE BELOW ADDS AT LEAST 15-20- HP POTENTIAL
https://www.amazon.com/Fel-Pro-1206...ocphy=9026987&hvtargid=pla-490401188779&psc=1
Stealthram Gasket
www.holley.com
EXAMPLE
heres how far my stock hood would close with a STOCK un-modified stealth ram intake,
stealthram base
porting the stealth-ram base and port matching the intake too the cylinder heads allowed a 300 cfm flow, its significantly less unmodified
more info
Www.firstperfcenter.com
firstfuelinjection.com
below is a picture I took about 14 years ago, a very early proto type version on my test mule corvette 383 engine where I was testing cams with versions of the custom intake during research.
btw, if your using a stealth ram it requires a small base distributor for clearance
if your replacing a TPI intake with a tunnel ram, HOLLEY STEALTH RAM or other intake requiring a small base diam. distributor, a gen 1 sbc distributor that fits physically, into the intake can be used in most cases, it can be made to function, most guys use aftermarket remote coil distributors, but the small diam. camaro distributor works,
I used a mildly modified HOLLEY 890-160 distributor
HOLLEY 890-160 distributor
Stealth ram /msd 6A /Holley # 890-160 distributor
Ignition wiring
the
- FIRST TPI Intake.(good choice) when properly ported and matched to a compatible cam gives you a bit better power
the crane 119661 and crower 00471 hydraulic roller cam in a 10:1-10.5:1 compression ratio 383-406 SBC
with heads that flow a MINIMUM of 250 cfm at .500 lift ,
and here a bit more flow certainly helps
THIS SELECTING DECENT HEADS IS CRITICAL
the 200cc and 210 cc brodix are decent
as are the AFR 195cc-210cc trickflow 195 cc and
230cc and PROFILER ,EDELBROCK, DART, 200cc-220cc heads
and several other heads
it makes no sense to put a decent intake and cam in any engine,
then restricting its potential with crappy stock cylinder heads
https://brodix.com/heads-2/small-block-chevrolet-compatible-heads/ik-series
http://www.buyafr.com/
https://www.profilerperformance.com/
https://www.profilerperformance.com/176-sbc-23-degree-heads.html
https://www.trickflow.com/parts/tfs-3241t001-c03/documentation
http://dartheads.com/dart-product/iron-eagle-23-215cc/
http://garage.grumpysperformance.com/index.php?threads/sellecting-cylinder-heads.796/
1.6:1 roller rockers, long tube headers a few flow exhaust and a 2800 rpm-3000 rpm stall converter or a manual transmission and a 3.54-3.73:1 rear gear ratio, and of course 32 lb -to 44 lb fuel injectors, (depends on combo/ components used) makes an impressive combo
intake comes with a new throttle body
http://garage.grumpysperformance.com/index.php?threads/stealthram-info.583/#post-754
http://garage.grumpysperformance.co...-other-efi-intake-manifold-info.431/#post-756