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

Engine Mod's

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Old Aug 5, 2004 | 11:10 PM
  #1  
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Default Engine Mod's

I know what i wanna do for my exhaust and intake. Maybe you guys could give me some ideas for engine mods... I'd like to add some pieces to the engine itself, without removing or rebuilding it. It seems adding 1.52 MM rockers is a useful mod, So i'm gonna add those in. Are they're any similar mods I can do? ... I guess I should let you guys know my goal- I wanna be able to smoke my bro's mustang . So any ideas what else to add?
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Old Aug 6, 2004 | 12:25 AM
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From: San Jose Pat Tillman - American Hero
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I wish I could help! I'm just not familiar enough with the 85 motors.... Sorry! Somebody'll chime in, though, I'm sure.
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Old Aug 6, 2004 | 12:36 AM
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i know you said u have ideas for the intake but i just have to say Porting the Plemun and bolting on slp runners are worth the $$. my friend had the same camaro i had and he had it done and what a difference it makes.

edit: forgot to mention he also had the Big Mouth Tpi Base Intake Manifold

Last edited by ynk1121; Aug 6, 2004 at 12:42 AM.
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Old Aug 6, 2004 | 01:03 AM
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If you have iron heads the 1.52:1 ProMagnums will add some HP.

Exhaust mods will give a real boost, especially if you do FL headers.

Also try:
-cut back spark plugs (see my site)
-under drive crank with over drive alt pulleys
-160deg F T-stat & fan switch
-SLP ram air intake
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Old Aug 6, 2004 | 02:18 AM
  #5  
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Originally Posted by mikey whipreck
I know what i wanna do for my exhaust and intake. Maybe you guys could give me some ideas for engine mods... I'd like to add some pieces to the engine itself, without removing or rebuilding it. It seems adding 1.52 MM rockers is a useful mod, So i'm gonna add those in. Are they're any similar mods I can do? ... I guess I should let you guys know my goal- I wanna be able to smoke my bro's mustang . So any ideas what else to add?
mustang? you cant smoke his mustang? let us all hang our heads in shame
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Old Aug 6, 2004 | 09:46 AM
  #6  
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Originally Posted by MrArmyAnt
mustang? you cant smoke his mustang? let us all hang our heads in shame
So you see the reason I need to pump up my vette alittle bit. It's embarrasing ... To be fair his is a '97 Cobra svt. I believe those are rated at 300HP/300Torque stock.
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Old Aug 6, 2004 | 09:49 AM
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Originally Posted by 65Z01
If you have iron heads the 1.52:1 ProMagnums will add some HP.

Exhaust mods will give a real boost, especially if you do FL headers.

Also try:
-cut back spark plugs (see my site)
-under drive crank with over drive alt pulleys
-160deg F T-stat & fan switch
-SLP ram air intake
I like the 160 Tstat and fan switch idea. And whats a site where i can take a look at those ProMagnums?

Thanks for the input btw
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Old Aug 6, 2004 | 12:22 PM
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Why not just go with 1.6 rockers since you're replacing them.
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Old Aug 6, 2004 | 05:00 PM
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Originally Posted by shotchkiss
Why not just go with 1.6 rockers since you're replacing them.
will add approx. 10-15chp. 1.52's will give just about nothing.
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Old Aug 6, 2004 | 08:55 PM
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I was told I might have a problem fitting in 1.6 rockers... and that 1.52's still give a pretty good gain. What is the stock size? I think it's 1.43? Does anyone have 1.6's in their L98? What kind of 'massaging' would need to be done to get em to fit?
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Old Aug 7, 2004 | 04:51 AM
  #11  
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From: Springfield Missouri
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Originally Posted by mikey whipreck
I was told I might have a problem fitting in 1.6 rockers... and that 1.52's still give a pretty good gain. What is the stock size? I think it's 1.43? Does anyone have 1.6's in their L98? What kind of 'massaging' would need to be done to get em to fit?
The stockers are 1.5 ratio non-roller, self aligning, if memory serves

go with 1.6 or 1.7 ratio with new valvesprings and you'll see some pretty good power. jegs sells them for like 180 bucks....that's almost 10 bucks per horsepower.....good money on a 'vette.
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Old Aug 7, 2004 | 04:56 AM
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I would go 1.6, 1.7s might boost your power band a bit too high out of the RPM band of the TPI manifold if I understand correctly.

Ohh and just a warning, this is how I started, I know am building a stroker motor that those 1.6s I intended for my 86 are now going on...
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