Rate my cam choice
Thread Starter
Drifting
Joined: Aug 2005
Posts: 1,289
Likes: 3
From: East Waterboro Maine
Rate my cam choice
Ok folks, the engine build combo is pretty much locked at this point, I just need to decide on the final cam specs. Here's what I'm working with:
1971 454 motor, bored 0.030"
Pistons: Forged Aluminum, 26cc Dome
Cylinder Heads: Airflow research 305cc Rectangle Port (as cast)
Intake Manifold: Edelbrock Torker II
Compression Ratio: 10.3:1 (approx.)
Carburetor: Not finalized yet, Probably 850 cfm
Exhaust: Probably 2 1/8" Primary Headers w/ dual exhaust
This is for a 4 speed car with 3.08 rear gears. Sometime down the line I plan to upgrade to a 5 speed tranny with 3:55 or 3:70 rear gears. I'm going for a street performance setup that will be good for both back road and in-town cruising. I also plan to make a trip down to the drag strip on occasion. I don't mind a slight lope.
Here's what I'm considering for a camshaft:
Hydraulic Roller, Duration @ 0.050" : 230° Intake, 236° Exhaust, LS 112°
Gross lift w/ 1.7:1 rockers : 0.595" Intake, 0.581" Exhaust
What do you guys think?
1971 454 motor, bored 0.030"
Pistons: Forged Aluminum, 26cc Dome
Cylinder Heads: Airflow research 305cc Rectangle Port (as cast)
Intake Manifold: Edelbrock Torker II
Compression Ratio: 10.3:1 (approx.)
Carburetor: Not finalized yet, Probably 850 cfm
Exhaust: Probably 2 1/8" Primary Headers w/ dual exhaust
This is for a 4 speed car with 3.08 rear gears. Sometime down the line I plan to upgrade to a 5 speed tranny with 3:55 or 3:70 rear gears. I'm going for a street performance setup that will be good for both back road and in-town cruising. I also plan to make a trip down to the drag strip on occasion. I don't mind a slight lope.
Here's what I'm considering for a camshaft:
Hydraulic Roller, Duration @ 0.050" : 230° Intake, 236° Exhaust, LS 112°
Gross lift w/ 1.7:1 rockers : 0.595" Intake, 0.581" Exhaust
What do you guys think?
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
That will be very mild on a 460 ci motor. It will make good over all power because of the 305 heads. I'm running the CC XE242/248 on my 427. Big cubes make real TQ monsters.
I'm just asking this. With 26cc domes, how do you get only 10 something compression? Your better off with flat tops and smaller cc chambers.
10.5 is about the limit with a 230 degree cam and 92 octane super unleaded
I'm just asking this. With 26cc domes, how do you get only 10 something compression? Your better off with flat tops and smaller cc chambers.
10.5 is about the limit with a 230 degree cam and 92 octane super unleaded
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
Actually with the TorkerII it will compensate for the poor bootm end of that intake manifold. I think you have a good combination with your chosen heads, a cam with higher lift specs would give more top end at the expense of valvetrain reliability. Your car should run very low 13's and high 12's in good conditions. You may want to consider a 750 or 830 annular discharge CFM carb over the 850 with the 3.08 gears (do some areodynamic work for your 160+MPH top end, Heh Heh!)
Thread Starter
Drifting
Joined: Aug 2005
Posts: 1,289
Likes: 3
From: East Waterboro Maine
Originally Posted by gkull
With 26cc domes, how do you get only 10 something compression? Your better off with flat tops and smaller cc chambers.
10.5 is about the limit with a 230 degree cam and 92 octane super unleaded
10.5 is about the limit with a 230 degree cam and 92 octane super unleaded
I didn't want to go with the flat tops and small chamber heads since I thought it would limit my my options too much. I didn't find too many heads with chambers small enough to boost the CR where I wanted it. Plus the AFR's will flow much better than those small chambers ever would.
My shop originally came back at me with some pretty long durations: 242/248 @ 0.050" w/ 112 LS but I thought that was too aggressive. I think the cam I originally posted will be a better fit - I sort of wonder if it would be too mild though.
Oh, and for that 160+ MPH top end, until I get the new tranny and rear gears I plan on adding one of these:
Last edited by Maine Vette; May 11, 2006 at 09:20 PM.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
My 427 has a 242/248 @ 0.050" w/ 110 lc h-roller cam that I installed Crane solid rollers on.
I'm not an edelbrock fan, especially some 30 year old TII design.
I'm not an edelbrock fan, especially some 30 year old TII design.
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
I've got a dual pattern solid Comp flat tappet cam that comes in around 240*. It's a fairly mild cam in a 468. I would go with what your shop suggested. The 112 LSA of that 242/248 cam will tame it down some, plus those squareport 305 heads should make some good power up top with the larger cam. Whatever you do, use a modern cam design and a better intake.
Thread Starter
Drifting
Joined: Aug 2005
Posts: 1,289
Likes: 3
From: East Waterboro Maine
Originally Posted by gkull
My 427 has a 242/248 @ 0.050" w/ 110 lc h-roller cam that I installed Crane solid rollers on.
I'm not an edelbrock fan, especially some 30 year old TII design.
I'm not an edelbrock fan, especially some 30 year old TII design.
Not a real fan of the TII either, but until I can buy an L88 hood it's the best I can do under the stock BB hood.
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Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I like it
with my .622 valve lift a single plane and free flowing exhaust DD2000 put's it right at 600 hp. H-roller and 112 LC with 454 ci would make it even milder.
It's fun car to drive. It makes enough noise that people notice, but it also has good around town street manners. You would have a 800 rpm idle. With probably about 12 inches of vacuum. My head lights are slow, but just a blip of the throttle and they pop right up.
I'm traction limited because your talking about way over 500 foot pounds of TQ.
I would not use less of a cam.
with my .622 valve lift a single plane and free flowing exhaust DD2000 put's it right at 600 hp. H-roller and 112 LC with 454 ci would make it even milder.It's fun car to drive. It makes enough noise that people notice, but it also has good around town street manners. You would have a 800 rpm idle. With probably about 12 inches of vacuum. My head lights are slow, but just a blip of the throttle and they pop right up.
I'm traction limited because your talking about way over 500 foot pounds of TQ.
I would not use less of a cam.
Melting Slicks
Joined: Jun 2002
Posts: 2,844
Likes: 99
From: Orrtanna Pa.
I ran a 230 degree flat tappet hydraulic in my 406 and it was way too mild for my liking.As George and others have said with 10:1 you want more duration,or you'll detonate under hard accelaeration.I now run a 254 degree solid and it's getting up there on the badd *** scale,but is still streetable in my opinion.I do run 3.70 gears which helps a bit,but if I had a 468 I'd be running a bigger cam than I'm running now for sure.