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Cam spec for 450 LS

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Old 03-13-2018, 05:45 PM
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Default Cam spec for 450 LS

Get ready to buy a cam for c6 corvette . New RHS 450 short block 11.50 compression with 260 TF LS 7 heads hollow stem valves crower shaft system. Looking @ LLSR solid roller maximum effort for the street . Car has a 4.10 gear with 15inch conversion . Need input . Thanx for your help .
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Old 03-13-2018, 10:47 PM
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I'd say 250/260-114+4
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Old 03-14-2018, 01:27 AM
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Originally Posted by Darth_V8r View Post
I'd say 250/260-114+4
I'd go with a bit more exhaust duration and less advance.

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Old 03-14-2018, 06:25 AM
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Would imagine Mod Speed Tigger should chime in soon
Max effort and street cam are like looking for a blonde AND a brunette
I agree with Darth with the 260-ish intake lobe. Guess some more info from you on transmission clutch/converter and intake/TB plus intended RPMs too
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Old 03-14-2018, 07:52 AM
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Originally Posted by Last 1 View Post
Get ready to buy a cam for c6 corvette . New RHS 450 short block 11.50 compression with 260 TF LS 7 heads hollow stem valves crower shaft system. Looking @ LLSR solid roller maximum effort for the street . Car has a 4.10 gear with 15inch conversion . Need input . Thanx for your help .
What intake and what exhaust system? Auto or manual?
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Old 03-14-2018, 03:26 PM
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The car has AR 1 7/8 headers m6 trans 266 first gear Mcleod RXT clutch / most likely I will be running Tony MSD intake. Car has a ls2 with cnc ls3heads with a Kaotik cam 235/[email protected] lift is 623/625 113+3 . The car has good driving ability after I installed the 410 gear

Last edited by Last 1; 03-14-2018 at 03:38 PM. Reason: Changed
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Old 03-14-2018, 08:13 PM
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Old 03-14-2018, 08:19 PM
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Car made great power as an LS2 with LS3 heads. North of 520whp if I recall.

Now he's decided to add cubes in efforts to destroy driveline components.

Great fellow here guys, appreciate you all chiming in with recommendations. Mike and myself have bacame good friends over the past couple of years and chat weekly and ahoot the ****. We both love cars and get tired of listening to our old lady's.
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Old 03-16-2018, 06:50 PM
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Originally Posted by brobinson216 View Post
Car made great power as an LS2 with LS3 heads. North of 520whp if I recall.

Now he's decided to add cubes in efforts to destroy driveline components.

Great fellow here guys, appreciate you all chiming in with recommendations. Mike and myself have bacame good friends over the past couple of years and chat weekly and ahoot the ****. We both love cars and get tired of listening to our old lady's.
Thanx for your help my friend looks like something 250/260 700/700 @113+3 may be Mike Jones cam or Cam Motion
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Old 03-16-2018, 10:05 PM
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Originally Posted by Last 1 View Post
Thanx for your help my friend looks like something 250/260 700/700 @113+3 may be Mike Jones cam or Cam Motion
I had Mike Jones spec a cam for my last SBC. It made exactly the power he said it would and at the RPM I asked for. Great guy to deal with. I would trust his recommendations.

Just to throw something out there. I don't think it needs a tight lobe center, you have enough cubes to make torque down low.

I'll throw my un-educated guess out there for a MAX effort "street" car as something like this:

Intake - 265 @ .050" - .420" lobe lift (.756" w/ 1.8:1)
Exhaust - 278 @ .050" - .400" lobe lift (.720" w/ 1.8:1)
LSA - 114 +6
ICL - 108
ECL - 120

This would require different valve springs than those that come with the assembled head if you are buying them that way. Also, a set of good shaft rockers.
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Old 03-17-2018, 03:31 PM
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Originally Posted by ColeGTO View Post
I had Mike Jones spec a cam for my last SBC. It made exactly the power he said it would and at the RPM I asked for. Great guy to deal with. I would trust his recommendations.

Just to throw something out there. I don't think it needs a tight lobe center, you have enough cubes to make torque down low.

I'll throw my un-educated guess out there for a MAX effort "street" car as something like this:

Intake - 265 @ .050" - .420" lobe lift (.756" w/ 1.8:1)
Exhaust - 278 @ .050" - .400" lobe lift (.720" w/ 1.8:1)
LSA - 114 +6
ICL - 108
ECL - 120

This would require different valve springs than those that come with the assembled head if you are buying them that way. Also, a set of good shaft rockers.
Looks good Cole. There’s a guy on Corvette forum who did a 454” build along with MMS 265’s recently. Tony spec’ed him a 264/276 on a 112. He made 685 at the tire, N/A of course. The 112 filled the cylinders a tad better.
Very streetable system in a C6Z.
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Old 03-18-2018, 06:45 PM
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Originally Posted by ColeGTO View Post
I had Mike Jones spec a cam for my last SBC. It made exactly the power he said it would and at the RPM I asked for. Great guy to deal with. I would trust his recommendations.

Just to throw something out there. I don't think it needs a tight lobe center, you have enough cubes to make torque down low.

I'll throw my un-educated guess out there for a MAX effort "street" car as something like this:

Intake - 265 @ .050" - .420" lobe lift (.756" w/ 1.8:1)
Exhaust - 278 @ .050" - .400" lobe lift (.720" w/ 1.8:1)
LSA - 114 +6
ICL - 108
ECL - 120

This would require different valve springs than those that come with the assembled head if you are buying them that way. Also, a set of good shaft rockers.
Already bought a crower shaft system and bought the heads bare . Set up for shaft system stainless hollow stem fearra valves waiting to buy a cam before buying spring thanx ColeGto for your input
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Old 04-22-2018, 06:16 PM
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What do u guys think about these spec for a maximum effort street and strip cam 260/263 @.050 660/660 lift 114 lsa for 450 cid/ tx
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Old 04-22-2018, 07:07 PM
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I have not seen many LS7 cams that did not have
at least +12-14* Exhaust Split let alone "Max Effort"
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Old 04-22-2018, 07:58 PM
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Originally Posted by NAVYBLUE210 View Post
I have not seen many LS7 cams that did not have
at least +12-14* Exhaust Split let alone "Max Effort"
That is y iam asking questions?thanx for your input
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Old 04-22-2018, 09:55 PM
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Most LS engines, Gen IV in particular, need lots of help in the exhaust department, as the intake ports are HUGE and the exhaust ports are NOT. Therefore the exhaust duration should far exceed the intake duration.
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Old 04-23-2018, 01:52 AM
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Originally Posted by Last 1 View Post
What do u guys think about these spec for a maximum effort street and strip cam 260/263 @.050 660/660 lift 114 lsa for 450 cid/ tx
Like the others have stated/indicated.....more exhaust duration. I would look at something from 274* to 278*.

114* LSA + 2* or 3*.

That said.....see what Cam Motion would recommend.

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Old 04-23-2018, 11:02 AM
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Default Ls-482 rhs

Hi ALL, I did not know there were SO MANY here with experience in the RHS block engine.

My RHS experience is in Off Road racing engines, a common build for a LS-482
My Experience is with shared "tech" from Wegner Automotive, the ones the TAUGHT COMP HOW the machine their RHS blocks.

I use a Calles 4.5" Crankshaft, Calles 6.350" Rods, Racetech Pistons

My engine has a MAX REV of 6500, with a 6200 Shift Point.

I run a 242/256 Cam of .600"/.560" on a 116 C/L
I too fit Crower Shaft rockers, Crower Cams cam.
This is a Dry Sump engine (pan) with External Three Stage Pump.

AGAIN, thanks Jake as you ARE SPOT ON !

The REASON is the CAM RPM TORQUE BAND must MATCH MAX Piston Speed.

What stroke will your crankshaft have ?

Problems found :

Oil pressure, my spec is an external pump.
You could fit a Crower Copper cam with Roller Bearings.

Pin Boss area INCREASE as the LS uses a "short" pin.
I have used a .990" pin in some, regardless ALL .180" + wall (M-350)
DLC Pin coating is a requirement.

Spark Advance VERY Low at 2500 RPM (18 degrees as common)

A 2" exhaust is fitted OR LARGER (required) Step Header

THUS, Last1 NO as to that cam spec 265/278

I would welcome you to call (949-250-1797) there is MUCH more to share.

ONE SUCH is that you will need to "sert" the short end bolt of the Crower cast steel Rocker mount OR the plate will break !

Lance
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Old 04-23-2018, 06:50 PM
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Thank everyone for their input . I appreciate your help I just trying to do it right the first time . Lance I will be calling you . Crankshaft is a 4.125 stroke and 4.165 bore -11 domes wiseco

Last edited by Last 1; 04-23-2018 at 06:59 PM. Reason: Changed
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Old 04-23-2018, 09:04 PM
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Originally Posted by Last 1 View Post
What do u guys think about these spec for a maximum effort street and strip cam 260/263 @.050 660/660 lift 114 lsa for 450 cid/ tx
My daily driver mild cam for a 416 is 237/245 .625/.,625 114 LSA as spec'd by Darin Morgan. It has 8 degrees split so for max effort, I think at least 10 degrees split would be desired.

Best bet is to get an expert like Pantera EFI, Mike Jones or similar to custom spec a cam for you.
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