97 vortec 383 cam swap
07-31-2007, 04:15 PM
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97 vortec 383 cam swap
383 vortec efi
1997 3/4 ton silverado hd 4x4
csfi converted to to mpfi
383 vortec 4 bolt main
bassani headers 1 5/8 shorty's
dual exhaust 2 1/2 with high flow cats
64cc edlbrock e-tec's 170cc runner 1.94/1.55 they flow 20% more than the vortec's on the exhuast
9.8-1 compression forged pistons kb forged -18cc dished
6.0 H beam 4340 forged rods
3.75 stroke crank
current cam
the cam is a roller xr258hr 258/264 adv. 206/212 @ .050 .485/.493 with 1.52 112 lsa
cam i am thinking about getting
08-502-8 Comp Cams"Extreme" Hydraulic Roller Camshaft, 218 / 224, .495 / .502 112 LSA, High performance application, largest with stock converter, noticeable idle
would it be worth the extra cash?
i guess what i'm try to ask will i see a major performance.
1997 3/4 ton silverado hd 4x4
csfi converted to to mpfi
383 vortec 4 bolt main
bassani headers 1 5/8 shorty's
dual exhaust 2 1/2 with high flow cats
64cc edlbrock e-tec's 170cc runner 1.94/1.55 they flow 20% more than the vortec's on the exhuast
9.8-1 compression forged pistons kb forged -18cc dished
6.0 H beam 4340 forged rods
3.75 stroke crank
current cam
the cam is a roller xr258hr 258/264 adv. 206/212 @ .050 .485/.493 with 1.52 112 lsa
cam i am thinking about getting
08-502-8 Comp Cams"Extreme" Hydraulic Roller Camshaft, 218 / 224, .495 / .502 112 LSA, High performance application, largest with stock converter, noticeable idle
would it be worth the extra cash?
i guess what i'm try to ask will i see a major performance.
Last edited by ss383; 07-31-2007 at 11:29 PM.
08-02-2007, 02:28 AM
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Originally Posted by YenkoST
Is this 383 Silverado from GM Performance? This is sstruck383 from that site.....do it....u won't regret it. Just keep the lsa at 112 for a good idle.
ya its me. i didn't know that you were sstruck383 on gm performance. thats nice to know. then that means you are yenkost on fsc right ? well i got my engine out of my truck and it is being inspect over at http://koernerracing.com/ for internal damage. remember i was having problems with it knocking.the people who built the short block are picking up the bill.
i think i found the perfect cam for my heavy *** 4x4 3/4 ton truck. i spoke to roger over at vinci high performance and he recommended crane cam 104227 Crane LT1 Camshaft, 210 / 224, .479 / .518 112 LSA, Mild cam with extremely strong powerband...
Crane 210/224 -- This is a sleeper . This cam is a TQ MONSTER. Will pull like a freight train from down low all the way to the top. Won't make huge peak numbers, but will get you scooting just as fast as the others. Crane was really on to something with this grind. I'd have loved to see them add about 10-15* of duration to both sides and a little more lift; it would have been a monster.
Some things to consider. Look at the best performing LT1 cams. Nearly all of them have a solid 12-14* intake to exhaust split in duration. The LT1 heads flow characteristics like an exhaust biased camshaft.
look at post from 746 cid @ 6:57 pm and fastbird @ 7:24pm
http://www.speeddensity.org/archive/...hp/t-3444.html
In 1996, GM incorporated the port design from the very successful iron LT1 engines used in the Impala SS, which was improved over the aluminum LT1 Corvette and Camaro engines. In essence, the Vortec head uses the iron LT1 chamber intake and exhaust ports in a standard-water-flow iron head.
my e-tec's are basically the vortec's a with a .050 larger exhaust valve and their exhaust ports flows 20% more than the vortecs.
http://www.chevyhiperformance.com/howto/97458/
i found this info very interesting.
Last edited by ss383; 08-02-2007 at 02:36 AM.
08-02-2007, 10:10 PM
#5
Originally Posted by ss383
ya its me. i didn't know that you were sstruck383 on gm performance. thats nice to know. then that means you are yenkost on fsc right ? well i got my engine out of my truck and it is being inspect over at http://koernerracing.com/ for internal damage. remember i was having problems with it knocking.the people who built the short block are picking up the bill.
i think i found the perfect cam for my heavy *** 4x4 3/4 ton truck. i spoke to roger over at vinci high performance and he recommended crane cam 104227 Crane LT1 Camshaft, 210 / 224, .479 / .518 112 LSA, Mild cam with extremely strong powerband...
Crane 210/224 -- This is a sleeper . This cam is a TQ MONSTER. Will pull like a freight train from down low all the way to the top. Won't make huge peak numbers, but will get you scooting just as fast as the others. Crane was really on to something with this grind. I'd have loved to see them add about 10-15* of duration to both sides and a little more lift; it would have been a monster.
Some things to consider. Look at the best performing LT1 cams. Nearly all of them have a solid 12-14* intake to exhaust split in duration. The LT1 heads flow characteristics like an exhaust biased camshaft.
look at post from 746 cid @ 6:57 pm and fastbird @ 7:24pm
http://www.speeddensity.org/archive/...hp/t-3444.html
In 1996, GM incorporated the port design from the very successful iron LT1 engines used in the Impala SS, which was improved over the aluminum LT1 Corvette and Camaro engines. In essence, the Vortec head uses the iron LT1 chamber intake and exhaust ports in a standard-water-flow iron head.
my e-tec's are basically the vortec's a with a .050 larger exhaust valve and their exhaust ports flows 20% more than the vortecs.
http://www.chevyhiperformance.com/howto/97458/
i found this info very interesting.
i think i found the perfect cam for my heavy *** 4x4 3/4 ton truck. i spoke to roger over at vinci high performance and he recommended crane cam 104227 Crane LT1 Camshaft, 210 / 224, .479 / .518 112 LSA, Mild cam with extremely strong powerband...
Crane 210/224 -- This is a sleeper . This cam is a TQ MONSTER. Will pull like a freight train from down low all the way to the top. Won't make huge peak numbers, but will get you scooting just as fast as the others. Crane was really on to something with this grind. I'd have loved to see them add about 10-15* of duration to both sides and a little more lift; it would have been a monster.
Some things to consider. Look at the best performing LT1 cams. Nearly all of them have a solid 12-14* intake to exhaust split in duration. The LT1 heads flow characteristics like an exhaust biased camshaft.
look at post from 746 cid @ 6:57 pm and fastbird @ 7:24pm
http://www.speeddensity.org/archive/...hp/t-3444.html
In 1996, GM incorporated the port design from the very successful iron LT1 engines used in the Impala SS, which was improved over the aluminum LT1 Corvette and Camaro engines. In essence, the Vortec head uses the iron LT1 chamber intake and exhaust ports in a standard-water-flow iron head.
my e-tec's are basically the vortec's a with a .050 larger exhaust valve and their exhaust ports flows 20% more than the vortecs.
http://www.chevyhiperformance.com/howto/97458/
i found this info very interesting.
With the E-tecs, I would really go with a 6* duration split. Probably at the most 8*. Your heads flow 70-75% intake/exhaust ratio. 14* is a bit much but I've seen it done. The new XFI grinds are blowing basically everything out of the water right now from Comp and its a 6* split and most pair them up with AFR heads or something equivalent. With the LT1 cam, you will have to grind the dowel pin off to about .300". I would look at the 214/220 from Crane with .452/.465 lift on 1.5 rockers. Upgrade to the 1.6s and that would be a great cam for you.
08-02-2007, 10:33 PM
#6
I think that yenko hit it about right somewhere around 214-220 duration should retain low end and pull mid rang as well. The 383 should and higher compression will both help out your low end. Should be fun to drive once it is all back together. So are you staying with the stock converter or is it a manual?
08-03-2007, 12:01 AM
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it an automatic. would you recommend a higher stall if so what size 2500
yenko look at post #18 same cam more valve lift i think i am going with this one crane 109821 214/224 .488/.509 112 lsa but thanks for pointing me in the right direction.
http://www.hotrodders.com/forum/new-...tml#post844319
yenko look at post #18 same cam more valve lift i think i am going with this one crane 109821 214/224 .488/.509 112 lsa but thanks for pointing me in the right direction.
http://www.hotrodders.com/forum/new-...tml#post844319
Last edited by ss383; 08-03-2007 at 04:00 AM.
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08-03-2007, 02:58 PM
#8
According to Crane, its a 214/222 but so that's a 8* split. That's much better than the 14* split you were looking at. That would be a good cam.
I would retain the stock converter for your truck, since its lifted and 4x4 it looks in your sig. The most I would go is 2200 stall rating.
I would retain the stock converter for your truck, since its lifted and 4x4 it looks in your sig. The most I would go is 2200 stall rating.
08-03-2007, 05:00 PM
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you are right yenko it is a 214/222 i was comparing it to the gmpp / crane # 12370845 that is a 214/224 they both share a .488/.509 lift with a 112 lsa.
so my engine will make more power than this 350 ho i found with the 109821 cam . by more power i mean 20 hp and about 40 ftlbs. i'm not looking for more than 400 hp because i know thats where the vortec's fuel system max out.
350HO Vortec dynoed finally, 385hp@5200-5400rpm, 450ft.lbs@3300rpm.
Modifications to crate engine; Crane 109821 roller, SpeedPro H345 pistons, FelPro 1094 head gaskets, measured CR 9.3:1, RPM Air-Gap, BG 650dp, T-Bolt ignition w/24`box, total timing 34`, dynoed w/headers, 87octane gas, Stainless Marine exhaust instead of GLM, that was first choice for boat. Final assembly of new drive, and finishing engine, hope to get boat ready for test drive in a week...
http://www.offshoreonly.com/forums/a...p/t-81600.html
so my engine will make more power than this 350 ho i found with the 109821 cam . by more power i mean 20 hp and about 40 ftlbs. i'm not looking for more than 400 hp because i know thats where the vortec's fuel system max out.
350HO Vortec dynoed finally, 385hp@5200-5400rpm, 450ft.lbs@3300rpm.
Modifications to crate engine; Crane 109821 roller, SpeedPro H345 pistons, FelPro 1094 head gaskets, measured CR 9.3:1, RPM Air-Gap, BG 650dp, T-Bolt ignition w/24`box, total timing 34`, dynoed w/headers, 87octane gas, Stainless Marine exhaust instead of GLM, that was first choice for boat. Final assembly of new drive, and finishing engine, hope to get boat ready for test drive in a week...
http://www.offshoreonly.com/forums/a...p/t-81600.html