Adding 100rwhp to c5
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Joined: Aug 2018
Posts: 57
Likes: 1
Again if 100 more is your goal i think you’d be smog passible at any cam that is 224 duration or less. I’m not very cam math knowledgeable when it comes to degrees of overlap and things which I’m sure is where your smog issues come in. Write customer service at tick or Texas speed, tell them your goals and see if they can get you a grind. I got a cam kit from tick and I was very impressed with everything. Both companies have great support. Can’t go wrong with either one. Good luck 👍
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Joined: Nov 2007
Posts: 31,294
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From: San Jose CA
St. Jude Donor '11
Nitrous gotta hit the brakes on that idea. Although a methanol spray might be in the build later down the road. I’m just wonder if the heads. Along with the other mods would push to that 450 ish mark. I don’t think I had included the rear diff was also change so @ 83 the cars rpm is @ 1750 1900rmps @ 100 Also the car does run shorty headers..out here in Cali you gotta keep it smog legal
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Joined: Oct 1999
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From: Guinness Its whats for B'fast JAWGA
CI 3-4-5-9 Veteran
100rwhp from where? A bone stock LS1 ~310 rwhp?
If so my plan would be:
243 heads
02-04 LS6 cam with 1.8 rockers or LPE GT2-3 cam stock rockers with a bushed trunion uprgade (CHE or Straub)
Valve spring to handle the cam/rocker above
Dorman LS2 Intake or FAST 92 Intake, LS2 TB
Cold air intake of your choice
Catback of your choice Z06 Ti if you want quiet
C6Z manifolds have been used in California and get very respectable gains. I would take them over shorty headers.
https://www.corvetteforum.com/forums...t-in-a-c5.html
Also do the supporting mods outline by Bill Curlee injectors, bolts, balancer, tune etc.
You may not get the full 410rwhp but I would expect ~380-400rwhp.
I am not an expert on CARB rules so you would need to consult local shops. If you can go bigger on the cam I would and not go with the LS6 cam 1.8 rockers or LPE GT2-3 stock rocker.
If so my plan would be:
243 heads
02-04 LS6 cam with 1.8 rockers or LPE GT2-3 cam stock rockers with a bushed trunion uprgade (CHE or Straub)
Valve spring to handle the cam/rocker above
Dorman LS2 Intake or FAST 92 Intake, LS2 TB
Cold air intake of your choice
Catback of your choice Z06 Ti if you want quiet
C6Z manifolds have been used in California and get very respectable gains. I would take them over shorty headers.
https://www.corvetteforum.com/forums...t-in-a-c5.html
Also do the supporting mods outline by Bill Curlee injectors, bolts, balancer, tune etc.
You may not get the full 410rwhp but I would expect ~380-400rwhp.
I am not an expert on CARB rules so you would need to consult local shops. If you can go bigger on the cam I would and not go with the LS6 cam 1.8 rockers or LPE GT2-3 stock rocker.
Last edited by 93Polo; Aug 27, 2018 at 11:11 PM.
Racer
Joined: Nov 2014
Posts: 390
Likes: 58
From: Columbus, OH
Made 456/420:
AI 241 HCR heads
223/235 113 + 2 Cam
Fast 92/ls2 TB(not ported-plan to port over the winter)
55 LBS injectors
LG 1 1-3/4 catted headers
Also did all the reliability stuff, caddy lifers new oil pump, chain, prods etc.
Paired with 3.90s its a surprisingly quick car IMO.
AI 241 HCR heads
223/235 113 + 2 Cam
Fast 92/ls2 TB(not ported-plan to port over the winter)
55 LBS injectors
LG 1 1-3/4 catted headers
Also did all the reliability stuff, caddy lifers new oil pump, chain, prods etc.
Paired with 3.90s its a surprisingly quick car IMO.
Last edited by Joepro95; Aug 28, 2018 at 01:00 AM.
jobberone
Joined: Aug 2003
Posts: 2,062
Likes: 8
From: Kailua Kona HI
Go with an iron block 6.2 and forced induction. You can run low boost and get to 550-600 depending on boost number. At low boost you can run a LS3 or LS7 with the proper internals but the block will take 600 rwhp. High boost and methanol gets you to 800. If you are going high HP go iron or an aluminum dart block. It will cost less money in the long run. I've run turbos but a SC will do if set up correctly. Your stock couplers are good to 1000 but they probably need to be replaced. Reinforce the tranny mount with a kit. The rear is ok if you use radials. If you try to stick with biased drag tires then you need to reassess your drivetrain. I've run 800 rwhp thru an AT with NEW stock couplers, a brace and an Eaton carrier with drag radials. That's not taking it to the strip every week or beating it up constantly. Heads aren't as big a problem with FI but they need to still be good and ported to your manifold.
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
the op can meet his goals with the aluminum block already in his car, there is no reason at all to go with an iron block in this case... it will just add more weight and run hotter
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jobberone
Joined: Aug 2003
Posts: 2,062
Likes: 8
From: Kailua Kona HI
What kind of tires do you have on your car? My C5 could spin the tires in 2nd with the all-season tires that the previous owner had on it, but with the mild summer tires that are on it now (Hankook Evo2) it will barely even spin in first. That's at 370whp, but I'm hoping for 450ish next year (heads, cam, intake manifold) and wondering what to expect.
Are torque tube couplers going to be a problem at 450whp for someone who doesn't drag race?
Are torque tube couplers going to be a problem at 450whp for someone who doesn't drag race?
jobberone
Joined: Aug 2003
Posts: 2,062
Likes: 8
From: Kailua Kona HI
Le Mans Master
Joined: Oct 2002
Posts: 6,799
Likes: 11
From: dudley MA
Check my sig. I did 450rwhp plus with afr 205 heads, 90mm fast, a 228 232 111 and 4.10.s Great driver. I havn't changed my setup in ten yrs!!
Last edited by pdd000; Sep 10, 2018 at 10:13 PM.
Advanced
Joined: Aug 2018
Posts: 66
Likes: 6
From: QC AZ
Made 456/420:
AI 241 HCR heads
223/235 113 + 2 Cam
Fast 92/ls2 TB(not ported-plan to port over the winter)
55 LBS injectors
LG 1 1-3/4 catted headers
Also did all the reliability stuff, caddy lifers new oil pump, chain, prods etc.
Paired with 3.90s its a surprisingly quick car IMO.
AI 241 HCR heads
223/235 113 + 2 Cam
Fast 92/ls2 TB(not ported-plan to port over the winter)
55 LBS injectors
LG 1 1-3/4 catted headers
Also did all the reliability stuff, caddy lifers new oil pump, chain, prods etc.
Paired with 3.90s its a surprisingly quick car IMO.
How is driveability around town?
Racer
Joined: Jan 2016
Posts: 280
Likes: 21
From: Austin TX
A cam and spring swap with full exhaust can get you 100 extra but I don't believe it will be emission legal in Cali. You may have to go with some spray or a blower kit.
Last edited by Millennium FRC; Sep 14, 2018 at 11:55 PM.