408 cam ideas
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From: vicksburg ms
408 cam ideas im fixing to pull the trigger on a tsp 408 long block with prc 225s but im a little lost on what cam I should put in it. its a dd 6 speed trans am ill never spray or boost it I want to make atleast 450 to the tire and have decent manners whats a good cam? hows the texas giant its made for 402+cubic inches hows the drivability will it beat my valvetrain to pieces if I dd im wanting to build it right the first time but im on a budget any ideas or comments are welcome
I would recommend you look into a 240/248 .605/.615 for a setup like that. We have used that a number of times in street driven 408s and been able to make the power you are asking for while retaining good street manners. The Texas Giant is a very large cam, it won't beat the valve train to death but you definitely notice how large it is. I think something like the 240/248 might be a little more friendly on the street.
I swapped my 234/242 114 .600/.610 LG G5X3 that was in my 418 to a 234/242 117+2 .600/.615. As I couldn't put up with the surging & bucking at light throttle/low rpm.
The new cam drives 10x better as my overlap is now 4* vs 10*. This cam still has great low end, and gained some mid range to top end power.
Russ Kemp
The new cam drives 10x better as my overlap is now 4* vs 10*. This cam still has great low end, and gained some mid range to top end power.
Russ Kemp
Your tuner couldn't get a cam with 10 degrees of overlap to drive nice in a 416? Time for a new tuner...
8 degrees can be daily driven in a 347. A 416 can swallow up a whole lot more overlap.
8 degrees can be daily driven in a 347. A 416 can swallow up a whole lot more overlap.
Thread Starter
On The Tree
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From: vicksburg ms
I was wanting to go as big as I could don't want to change cams down the road that's why I was looking at the Texas giant cam. I got a good tuner if I can dd a bigger cam I would like too I don't mind some surge with a big cam
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Iv had the giant. Not something I would want to deal with on the street for dd use. It has alot of overlap. It will buck in the lower rpms. not a nice cam if your in traffic alot with a 6spd. Pulls hard uptop but not so much in the lower end. I swaped it for a custom cam. Less dur with more lift. Less overlap as well and it ran 1000times better and make a **** load of power in the lower/mid range. Car idle smooth as well. Didn't lose any power and gained tq. The giant is a old grind. Been around for years. There are better stuff out nowadays but the giant still has its place.
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the streetability aspect is all in your tuner. MAKE SURE TO GO TO A REPUTABLE LSX TUNER! I have a 235/242 635/615 112+2 in my 408 and i have no surge/bucking issues. But o what 06Sierra2 said, get a custom grind cam to match YOUR setup. Martin at Tick is great as well at Pat G would did mine!
For a DD 408 with PRC 225's I'd grind:
237/242 .622"/.615" 114lsa
Nice under the curve and average power with 11.5 degrees of overlap. Those 225 heads will make great average power on a 408 and with a little bit of an early EVO you'll get some top end out of it as well without having to close the intake valve excessively late.
If you have what I consider the "normal" off the shelf 2-3cc flat top Wiseco/Diamond/Mahle piston from TSP you could get the 225's in a 68cc chamber, run a .051" gasket and be right around 11.4-11.5:1 static compression. With the cam I mentioned it would make for a very nice driving and performing combination. With a Fast 92 or 102 I don't see why it couldn't make 500+rwhp/480rwtq.
We made 506/444 with those heads on a stock bottom end 6.0 with the V.2 Polluter cam and a Fast 92 and 11.45:1 compression. I don't see why with a slightly less aggressive cam you couldn't make the same amount of hp and much more torque with the 4" stroke crank.
237/242 .622"/.615" 114lsa
Nice under the curve and average power with 11.5 degrees of overlap. Those 225 heads will make great average power on a 408 and with a little bit of an early EVO you'll get some top end out of it as well without having to close the intake valve excessively late.
If you have what I consider the "normal" off the shelf 2-3cc flat top Wiseco/Diamond/Mahle piston from TSP you could get the 225's in a 68cc chamber, run a .051" gasket and be right around 11.4-11.5:1 static compression. With the cam I mentioned it would make for a very nice driving and performing combination. With a Fast 92 or 102 I don't see why it couldn't make 500+rwhp/480rwtq.
We made 506/444 with those heads on a stock bottom end 6.0 with the V.2 Polluter cam and a Fast 92 and 11.45:1 compression. I don't see why with a slightly less aggressive cam you couldn't make the same amount of hp and much more torque with the 4" stroke crank.
