|07-12-2008 06:57 PM|
Hey Guys Ive been lookin and lookin at the vortecs and one thing bothers me.
I know these heads were designed for truck motors (ie lots of torque) and damn near every dyno I seem of them, they do Amazing down low but not so well up top.
I could really care less how much torque this motor makes as long as it makes good hp, do you guys think there could be a better choice for around the same price for heads for a top end motor?
The vortecs Im lookign at are the Patriot versions. The already come with screw in studs, and bigger valves.
Or do you think that most peopls powerbands is due to their manifold and cam choice, I know those playa big part but do yall think that isky cam with the patriot vortecs will make a good top end motor?
|07-12-2008 04:49 PM|
It doesnt really require exotic or all that expenisve parts, just a little more in key areas.
I helped build a cammed Lt1 to last at 7K it pretty mcuh just involved better bearings in the bottom end, and ARP rod bolts. Thing is still chuggin 30K miles later.
|07-12-2008 04:40 PM|
|Blazin72||Just trying to give you ideas to help save a little money. You're looking for a "cheapy" engine right? A high rpm engine that is built to last a long time is not going to be cheap...|
|07-12-2008 04:23 PM|
That could make a good fun street engine but it would absolutely blow for a strip only motor.
|07-12-2008 03:52 PM|
Opti, want to keep costs down? Build the 383 with very good low-mid range torque and run a slightly higher gear. Lower rpm keeps wear and tear down and you won't have to be as concerned with the expensive high strength parts that is needed for higher rpm engines. Building an engine that doesn't have much torque down low and combining that with lower rear gears means you're going to have to spin the engine higher. Higher rpms means more stress on engine parts which, in turn, means you're going to be spending more money on expensive parts to keep from grenading things.
Just something to think about.
|07-12-2008 03:31 PM|
|07-12-2008 03:07 PM|
Ive only seen two stock Lt1 pistons fail. Both were on decent size shots fail (200 an 180) the others were on cheaply build 383 and 388 where they skimped on pistons (hyper) and thought they could still run big shots.
Id still prefer to run forged stuff but I will reconsider some of the hyper sutff.
|07-12-2008 03:01 PM|
Althou the vortecs certainly work very well (I run a ported big valve set on my 406SBC)
The summit heads I recomended will make more power out of the box in this motor and have room to grow. The valve train is ready to rock for the Isky Cam
If you want forged pistons, just substitute/+add the L2256F-60 pistons for the ones in the summit kit.
You'll find another use for the left over pistons.
You find this motor gets the job done for you the first time, either way.
The hyper pistions in your friends LT-1 motors are not the same as the KB/Summit or Federal Mogul stuff. They are fitted much tighter and do not have the same heat treat. They are not a performance piston and are not for any nitrous use. Do not compare.
If you set the pistons up correctly with generous ring end gaps, set the nitrous fuel system up for proper fuel delivery and use 100% race gas when spraying and don;t get carried way you'll be fine with any piston.
You're going to find that any n2O shot over 150-180 hp get $$too expensive over time$$ any ways.
Keep the whole thing reasonable and tune it correctly and it will not give you issues.
|07-12-2008 02:51 PM|
I run around with mostly Late model guys since I own an LT1, but I have seen first hand Quite a FEW of them fail especially the hyper ones. Most of the forged ones I seen fail are from major tuning issues on big boost or spray cars.
Its more justa piece of mind thing. I mean if I throw the vortecs on a hate them no biggie just replace them when I have money, If I dont liek the pistons then its a ***** to replace them.
On a side note I got my dad on board. Ever since I sold my 69 Firebird (43K miles, bought it as an investment) hes wanted another project to work with me on and I think me and him can have some fun on a junkyard build liek this.
|07-12-2008 02:46 PM|
One piston was replaced and the motor was freshened and put right back into service.
Cheapy cast H345NP pistons.
The only time I've ever seen a cast piston fail (or a forged piston fail for that mator) is from pure abuse like using the wrong fuel.
Even on nitrous. Have run many cast piston motors on the spray with no problems. You do need to open up the ring end gaps thou. Most people have a lot of trouble getting their head around that. Thats why they have problems.
TRW/speedpro L2256F-60 forged pistons are you next best cheap step up if it will make you sleep better at night.
|07-12-2008 02:41 PM|
Do you have experience with those guys. The verter was one thing I didnt want to cheap one.
Ive seen alot of guys by the cheaper stalls and have a lot of problems with them.
Will these guys build it to my specs, like tr, stall speed and everything.
|07-12-2008 02:37 PM|
If you set the carb and distributor up properly with vacuum advance you'll find the street cruising and fuel mileage accepable for a racey motor.
These guys in Texas
have a great transmission- racing torque converter package for you.
|07-12-2008 02:34 PM|
|Opti||I will not run cast or hyper pistons.|
|07-12-2008 02:28 PM|
|07-12-2008 02:14 PM|
You really like that cam dont you.
That son of a ***** is huge. I really like that its ground on a 106 though, I always hated that all the EFI guys run these wide LSA cams cause the big cam grinders think a 106 or 107 will not work with EFI. BS.
As far as im concerned a 106 is the only way to go on a SBC.
Do you have experience with this cam. The car will be very very occasionally street driven (probably just to and from the track).
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