Hey everyone, got my corvette going with stock injectors and stock pressure right now cause the cam is too mild to take more gas. (I have better injectors ready to go 24-27 pound depending on pressure) I have 1988 l98 with a FIRST TPI and long tube headers so it breaths great in and out, that is if it was allowed to. I put 1.6 roller tip rockers on and it’s only helped slightly. The build is fun but still street-able, I’d like to be able to make the 12 hour drive back to my home state and back without blowing anything up in the future but also don’t want a limp noodle. From what I’ve read so far I want a lobe separation of 107-108 since the first make more power sooner and falls off higher up but I can’t tell much else. (Did more reading and that information might be wrong but I’ll leave it there just in case) Any help is appreciated

 

Try the chevy crate motor cam that comes in the chevy ht383.
buckets of torque, falls off around 5000 rpm.

 

I’ll check that out thank you

 

Looked into it and it’s pricy and not exactly what I’m looking for, I’m looking for a shift point around 6-6.2k since that’s the limit on my intake, but I’ll keep it in consideration just in case. Thanks again

 

With a first, keep it in the 218/224 range. That'll peak early (mid to upper 5000 range) and carry out to around 6000-6300. And it'll take advantage of the runner characteristics of the intake. You can go larger but you won't be gaining much. You have a roller block so any cam will be in the 300$ range.

 

Yeah the more looking I’ve done the more I’ve noticed that, but that’s really good to know, so 218/224 range. I’ve heard lift should be at or under .050 or valves might hit

 

Are the valve springs still stock? If not, what brand and part number and what was the installed height?

I've never checked max valve lift on the stock pistons in an L98 before (dependent on lobe spread and the installed intake centerline), so I can't say for sure what the maximum lift could be. Hopefully someone that has will reply. However, I've seen a number of posts of HOT cams installed in them with .525 lift (1.6 rockers) using upgraded springs.

 

the springs I have on it are comp cam 981-16 which have an installed hight of 1.7 and max lift of .49. I’m looking into new heads though so those might be irrelevant. But looking into a head cam combo to do both at the same time

 

There is some info and links in this thread.

 

Summit 8802

 

that one actually looks really promising, thank you.

also thanks for the thread 88

 

The Comp 270HR Xtreme 4x4 would be a good cam for you if you want to run the stock heads with the valve springs you’re running. 220/224 – 111, 0.506/0.506 (1.6 rockers). If you know for sure they’re set up on at least 1.7”, binding clearance will be fractionally tight at .044”, but with the 1.94 valves and no more RPM that you’ll be shifting at you should be OK. I’ve used those springs on a number of builds over the years and I’ve personally run them before on a 2.02 valve (heavier) with .506” lift, shifting at 6400rpm without any issues.

Prices have gone up, but at least it’s in stock at Summit.
https://www.summitracing.com/parts/c...make/chevrolet

I’ve run a little more overlap than that cam with a FIRST on a 355 with a about a 0.5 bump over your compression. Using 24lb FMS injectors, it ran OK on a stock 350 chip. So, while I highly recommend you getting the equipment to burn your own, until you do, the cam above will run OK on the stock chip playing with the base timing and fuel pressure adjustments. A tighter lope spread with more duration could work a little better for you, but you’ll need to be able to burn your own chips to get it to run “right”.

If you go with aftermarket heads, you need to figure out your budget and what brand, then pick the cam. You’ll want to run as much lift as you’re comfortable with to take advantage of them. Also, generally speaking, with as good as your exhaust system is, with your LTR intake and aftermarket heads, you won't need much if any split on the duration - possibly even a single pattern cam depending on the exhaust/intake flow ratio.

 

I spent all night pretty much trying to answer that question and as long as I can I’m definitely aiming for the 195cc AFR Enforcers with a 1003 felpro head gasket. It comes with .600 max lift springs. That’s all really good information to have, would you recommend the same cam with those the new heads or would a different one be better?

 

You're getting heads that flow better hat higher lift, get a cam that will take advantage of that no? Comp sells the XE lobes in a high lift version that will be in the mid .500 range. ?If you do heads I would look for something more along those lines.

 

ah so the XE lobes with high lift would be a good match, let me see if I can find that

 

You may have to call for that or special order. But the 4x4 lobes are essentially the same pattern. You could also just run a 1.6 rocker but that can be more expensive than just usijg a better grind.

Edit: that summit grind would probably work really well. I'd do that.

 

Hello BadSS, where can you purchase equipment to burn your own chips? Thanks...

 

Hello Again BadSS where do you purchase this type of equipment from these days? Thank you.

 

i run 1.6’s already, but yeah if summit has their own id rather order that than custom

 

Where depends on how deep you want to get or be involved.

Probably the best information I know of, and what helped me when I got started, is the information over on thirdgen.org. I'd suggest you spend some time reading through the information at the link below to get an idea of what's needed for a basic "burn" and then decide if you want or need to do more than that.
https://www.thirdgen.org/forums/diy-...uide-book.html

After reading through that, you'll see there are options to "just" burn and replace "chips" (which is what I did at first) to some offerings from Moates that does more.
http://www.moates.net/gm-19851995-c-64.html

There are also options ​​​to modify/replace the ECM with something like the Dynamic EFI, EBL P4. I've yet to use it, but I sent an ECM to Dynamic EFI and will be using the EBL P4 Flash on my new build. It added some additional tuning features over "stock" and was a better fit for my needs on the latest build.
https://www.dynamicefi.com/EBL_P4_Flash.php

Hope the information and links help.