LS7 427 build for a truck
05-13-2007, 07:14 PM
#1
LS7 427 build for a truck I'm building a 427 to replace my 408. The block is a Katech LS2 resleeved to 4.125" with billet mains and ARP bolts. The crank is a 4" stroked dragonslayer from Callies with their Compstar rods. The pistons are Mahle's with coating.
Heads are ETP41 with the 2.20" ti valves, Patriot extreme springs and Jessel shaft rockers (1.8). It will be topped off with a LS7 intake, 90mm throttle body and 1-7/8" headers.
I'm down to a cam selection and would like some opinions. Compression ratio will be around 12.6-12.7 and plan to shift it around 7000-7200. My first thoughts are something around 244/248 625/630 110 or 112 LSA advanced maybe 4*. Even thinking maybe solid roller. Give me your thoughts.
Heads are ETP41 with the 2.20" ti valves, Patriot extreme springs and Jessel shaft rockers (1.8). It will be topped off with a LS7 intake, 90mm throttle body and 1-7/8" headers.
I'm down to a cam selection and would like some opinions. Compression ratio will be around 12.6-12.7 and plan to shift it around 7000-7200. My first thoughts are something around 244/248 625/630 110 or 112 LSA advanced maybe 4*. Even thinking maybe solid roller. Give me your thoughts.
05-13-2007, 08:30 PM
#2
That's a fairly mild size cam for the application. I would recommend the 112LSA with 0 advance with the compression you're talking about.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
05-13-2007, 09:36 PM
#5
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Originally Posted by 67SS509
I'm building a 427 to replace my 408. The block is a Katech LS2 resleeved to 4.125" with billet mains and ARP bolts. The crank is a 4" stroked dragonslayer from Callies with their Compstar rods. The pistons are Mahle's with coating.
Heads are ETP41 with the 2.20" ti valves, Patriot extreme springs and Jessel shaft rockers (1.8). It will be topped off with a LS7 intake, 90mm throttle body and 1-7/8" headers.
I'm down to a cam selection and would like some opinions. Compression ratio will be around 12.6-12.7 and plan to shift it around 7000-7200. My first thoughts are something around 244/248 625/630 110 or 112 LSA advanced maybe 4*. Even thinking maybe solid roller. Give me your thoughts.
Heads are ETP41 with the 2.20" ti valves, Patriot extreme springs and Jessel shaft rockers (1.8). It will be topped off with a LS7 intake, 90mm throttle body and 1-7/8" headers.
I'm down to a cam selection and would like some opinions. Compression ratio will be around 12.6-12.7 and plan to shift it around 7000-7200. My first thoughts are something around 244/248 625/630 110 or 112 LSA advanced maybe 4*. Even thinking maybe solid roller. Give me your thoughts.
I also think it is a pretty mild cam for that setup. If you request that lift, will that be for the 1.8 rockers? With 1.8 rockers, lift will increase of course over the 1.7's. I assume when you spec out a cam, you will tell them that you have 1.8's. With that said, I wouldn't go any smaller then .650ish, but keep it around that. Here's what I would probably spec out for my fantasy 427, 250/258 .650 .640 on a 110-112 lsa @.050 0 advance with high compression. I havn't heard of those heads though, so I could be a little off. I would actually go 110 lsa or less if I were to shift at 7000 or more.
05-14-2007, 07:52 PM
#6
Looks like my thoughts on advancing the cam are a little different from everyone else. My thinking is with a heavy truck and streetable converter (3600) to move some of the power lower in the rpms. My present cam in my sig pulls to 7000+ with 4* degrees of advance. And that's with the truck intake.
