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Discussion in 'High Performance Modifications' started by ULTM8Z, Aug 20, 2021.
Yes, I would guess that S-10 is stinky rich.
Mine is more like the 3rd gen in 7/8. I have Magna Flow mufflers with an X pipe, which throws another factor into the equation. I need to see if I can get a good audio/video of mine at idle.
Thanks guys... yeah, honestly I only want to do this once. The thought of getting it all re-assembled and then having to do a cam swap after that makes me cringe.
This guy is running the non-Marine version of the cam I'm running (I got the marine version for the 112 LSA, vs the 110 in the non-marine). But his car sounds exactly like mine did in terms of exhaust note. Fast forward to 1:15 where he starts it up.
I'm thinking I may do this cam...
Duration @ .050 (Int/Exh): 215/224; Gross Valve Lift (Int/Exh): .489/.489; LSA/ICL: 112/108;
Talked to Lunati this morning and they're saying this should do I what I want in a 383.
With my 1.6 rockers, it'll bump it up just a bit closer into the 217-218 range like the other cams I was looking at, but it still gives me the ability to back off for better idle quality (change rockers instead of the cam). Yeah, I'm picky, ok?! Lol...
His cam calculates out to 47° overlap, and has a 106 ICL. This Lunati cam comes out to 49.5° and 108. So a bit more overlap, and ICL 2° retarded relatively. In a 350, you'd expect a more noticeable idle. But I'd imagine a 383 probably should absorb most of that without a significant difference.
Ok, I finally made my decision...
I started remembering a discussion I had going with Lowend back when I was planning for my 1.6 rockers last year.
So going with Lowend's recommendation, I also talked to Crower today and they were also recommending a wide LSA for what I'm after...
What they recommended was their 00482LM
Part Number: 00482LM
Chevrolet Hydraulic Roller Camshaft
Chevrolet - 262, 267, 283, 302, 305, 307, 327, 350 & 400
Performance level - EFI, Forced Induction & NOSINT/EXH - Dur @ .050” Lift: 213°/221° RR: 1.5/1.5 Gross Lift: .505”/.525” LSA: 114° RPM: 1900 to 5900 Redline: 6400
The next one up was [email protected], which I think will be pushing it.
Understood it's very tame cam for a 383 and I'll give up some peak torque lower in the rpm range due to that wideLSA, but given I only want to do this once and I know I'll get a nice idle with this. I figure at this point I'll be far more unhappy with an unsatisfactory idle quality than if I end up with 430 ftlb instead of 440 ftlb (or whatever it is), so I'm going to err on the side of caution.
The 1.6 rockers will add a little more "oomph" on top of this cam profile, so I think in the end I'll be happy (I noticed a difference when I put them on the 350 with the 212 cam earlier this year before the spun rod bearing).
If you have someone you can talk to at Crower, bounce the 1.6 rocker idea off them if you didn't already. Would be nice to get their opinion on that change before you do it on your own.
yeah he was cool with the 1.6 rockers. I mentioned I was running those. He said it'd it make the cam just a hair more radical enough to not be totally drowned out by the 383, since the cam profile was more for a 350.
The AFR heads are evidently good for .600 lift up to like 6500 rpm or something like that (and my guess is AFR has some margin built into that number too).
BTW, the short block shipped today from Summit... just got the email.
though sounds like the cam is going to be long lead... talked to a number of cam companies and they're all experiencing shortages on cores these days...
Nice. Worth waiting for though, Crower is good stuff.
if all you want is a rowdy idle then get a remote timing retard & use it with an MSD or equivalent box...when pulling into a gas station or cruise in dial it WAY back...it'll be lopey as hell
He is looking for the exact opposite. Needs a cam with very little overlap and strong vac signal to heep his TPI happy.