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

L98 budget engine upgrades. Will it work?

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Old Jul 22, 2018 | 08:52 PM
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Originally Posted by Kevova
Not related to you build did Holden use tpi or mpfi there? I read years ago OZ had better metallurgy in their engine parts then here in the U.S.
Which holden are you referring to? I have 2 holden commodores, both of which are direct injection.
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Old Jul 22, 2018 | 10:31 PM
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I was thinking Holden was using GEN 1 SBC. It appears I was mistaken.
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Old Jul 23, 2018 | 02:42 AM
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Originally Posted by Kevova
I was thinking Holden was using GEN 1 SBC. It appears I was mistaken.
They used ls1's for a number of years but I've never driven one. I've got the Aussie made 5 liter and a piece of crap 3.6 liter v6
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Old Jul 23, 2018 | 03:17 AM
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I'm liking the sound of the super ram. Ive been reading about it on other threads, and seems like the intake to go with. My thoughts are, I'll start with a good set of headers, gut the cats, and use some high flow mufflers. Then I'll move onto the super ram, although I have a question about that. Will the super ram fit under my hood? After I have a decent intake, I think I'll move onto the cam, and roller rockers, etc. and stick with a hyd flat tappet cam, since I'm not chasing high horsepower numbers. Then a tune up and see where I'm at from there. That should be around my $3000 budget
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Old Jul 23, 2018 | 03:33 AM
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Update on that last post. I've been doing some more reading up and have no idea which intake to go for. Some say mini ram, some say super ram, some say TPI. Too many decisions
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Old Jul 23, 2018 | 05:40 AM
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The superram will work great in your application. It pulls hard from idle to 6000 rpm.
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Old Jul 23, 2018 | 05:49 AM
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Originally Posted by bjankuski
The superram will work great in your application. It pulls hard from idle to 6000 rpm.
​​​​​​Do you know if it will have any troubles fitting under my hood? Thanks for the advice
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Old Jul 23, 2018 | 07:15 AM
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Originally Posted by C4NightRider
​​​​​​Do you know if it will have any troubles fitting under my hood? Thanks for the advice
Super ram is fine as is. Mini ram. HSR needs cutting.
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Old Jul 23, 2018 | 08:12 AM
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Only thing wrong with SR is that it's harder to find one since they're no longer made. I run a SR.
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Old Jul 23, 2018 | 08:25 AM
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Superram aren't terribly hard to find for a l98. They are expensive, most of the time 1000 - 1500. There is a plenum and runners in parts for sale now.

Last edited by Kevova; Jul 23, 2018 at 12:41 PM.
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Old Jul 23, 2018 | 11:07 AM
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Originally Posted by Kevova
Superram are terribly hard to find for a l98. They are expensive, most of the time 1000 - 1500. There is a plenum and runners in parts for sale now.
It blows my mind how expensive these are getting. I think I bought mine (used) for something like $400 or $600 about 12-15 years ago.
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Old Jul 23, 2018 | 11:23 AM
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Originally Posted by ctmccloskey
The suggestion of using an aftermarket intake is a good one to follow. The original EFI system for the L98 was designed for a 305 engine not the 350.
Where does this "fun fact" come from? Seen int internet told many-a-time....never seen it in ink, anywhere. Who said this, that's credible? Not trying to be a PITA here....I'd really like to see this claim, substantiated, somewhere, somehow, by someone. .
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Old Jul 23, 2018 | 12:28 PM
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The book:
How to Tune and Modify Chevrolet TPI Engines
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Old Jul 23, 2018 | 12:33 PM
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x2 on superram prices, dont see anyone paying a grand, 1500 that is insane. Plus if you want to put work into it afterwards?

still have that old Lingenfelter book on building sbc power he sure got some good #s wtih that intake.

Last edited by cv67; Jul 23, 2018 at 04:55 PM.
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Old Jul 23, 2018 | 01:25 PM
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Originally Posted by scorp508
It blows my mind how expensive these are getting. I think I bought mine (used) for something like $400 or $600 about 12-15 years ago.
But if they aren't making them anymore and you want it, price goes up. Choice is getting less every day for alternatives
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Old Jul 23, 2018 | 03:42 PM
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Originally Posted by vader86
The book:
How to Tune and Modify Chevrolet TPI Engines
Really? By Vizard? I have that book. I'll have to flip through it again b/c I don't recall that at all. It's odd that was never mentioned in McLellan's book or Lamm's book.

The claim that a CFI was made for a 305 is totally believable; it was being developed during the time when the Kalifornia Korvette came with a 305....and look at the runners. The TPI though?


With the SUper Ram being so hard to get now days, I'm surprised there aren't more/other medium length runner intakes being brought to market by other vendors.
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Old Jul 23, 2018 | 04:43 PM
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Instead of a SR which costs so much and is hard to get, how much more would it be for a sheet metal intake? IIRC, it was about $2000 and I can have it tailored to the profile I want.
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Old Jul 23, 2018 | 07:13 PM
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Originally Posted by aklim
But if they aren't making them anymore and you want it, price goes up. Choice is getting less every day for alternatives
Yep, supply and demand, still blows my mind though. Though I bet someone could make a great replica with 3D printing these days.

Last edited by scorp508; Jul 23, 2018 at 07:14 PM.
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Old Jul 23, 2018 | 08:02 PM
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If better heads are on the table, a nice affordable option might be the Enginequest heads. They makes a Vortec type head that accepts the early intake and valve covers. Pretty sure they also accept all the old front drive stuff. They are iron heads, but reportedly make 30-40 more HP to the wheels than most any old small block head. In the states they are sold by Competition Products and are less than 900 bucks. I believe they are an Aussie company.
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Old Jul 23, 2018 | 08:11 PM
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Originally Posted by bosco022
If better heads are on the table, a nice affordable option might be the Enginequest heads. They makes a Vortec type head that accepts the early intake and valve covers. Pretty sure they also accept all the old front drive stuff. They are iron heads, but reportedly make 30-40 more HP to the wheels than most any old small block head. In the states they are sold by Competition Products and are less than 900 bucks. I believe they are an Aussie company.
Interesting, I hadnt heard of them before. Might be something to look into. I can see this project could quickly snowball into doing more than I originally planned, lol. Thanks for letting me know about them
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