SprayedLT1

iTrader: (8)

I'm looking for some advice on a stroker engine I'm going to be building very soon, and I have a lot of questions here. The car will be a fair weather/strip car that will see some cruising and some street action. I shoot a 175 wet shot now, and may I add another stage for 200/225/250 total. I am going to get an Eagle fully forged rotating assembly.

What are the pros/cons of 383 vs 396? I recall reading something about the ringlands being weak on the 396 pistons due to the high pin location...is this right? I know that the more inches, the better, but I want this engine to hold up for at least a couple years.

I also haven't decided which heads I am going to use. It's a toss up between some ported out stock heads (stock valve size) and a set of out-of-the-box Trick Flows. Since I haven't decided on which heads I'm going to use yet, I haven't decided which pistons I should get with the rotating assemly; The -16cc dished pistons will give me ~9.8:1 cr with the Trick Flow's 64cc chambers, but what would the stock head's 54cc chamber give me for cr with the same piston? I'm sure the -5cc flat tops will be too much cr to run al the nitrous I want to, right? Which piston/head combination will give me the the best cr for what I want to do with the car? How about the best head gasket? I was thinking of using the Impala gasket to get the quench tight.

The cam I want to use is the XFI 468 (grind number 292XFI HR 13). Do box-stock Trick Flows or ported stock heads flow good enough to support the demands the stroker/cam are going to need? I know you make power in the heads, but I'm on a limited budget, and most of the money is going toward the shortblock.

Thanks for any help and advice you can provide.

speed_demon24

iTrader: (6)

Build a 355 with good pistons/rods and a stock stock crank and put a set of badass heads on it with a custom cam, and nitrous loves compression so the more the better. That combo will be ALOT faster than a 383/396 with heads that choke the motor.

redneck01

iTrader: (3)

i second that...however, a 383 with a decent custom cam and heads with nitrous would really work out well. remember a 396 will be tougher to cool down on the street, whereas a 383 would make a larger cam more streetable..the 355 will act like a monster cam is in it. just my $.02

SprayedLT1

iTrader: (8)

So you think that a set of fully ported stock valve sized heads would choke a 383 with that cam?

I wasn't too serious about the 396, but it was a thought, especially since for some reason, the kit is cheaper from Summit Racing than it is for the 383.

My reasoning for wanting the stroker now is so that I have a good platform to build on in the future. My engine is thrashed right now (something in the bottom end, probably a spun bearing) so a rebuild is necessary. If I do the stroker now, I will be able to drive the car, and it should run pretty well, even with stock ported heads I imagine. I can always do better heads next year, and when I do, I will have a good strong shortblock with more cubes.

97LT1

iTrader: (3)

Depends on the cam size and rpm, if he will choke the 383. It seems that you will have a lot more torque and it would be more streetable also. Just talk to Brett about cam pairing with stock head castings for 383 (strokerace)

I say stroke it and build you a bullet proof shortblock for the future.

SprayedLT1

iTrader: (8)

The problem is that I'm just not too comfortable running a 200 shot with heads and a nice cam on a stock crank, even with decent rods. So, if I have to upgrade the bottom end, I may as well just stroke it, considering the 383 kit is practically the same price as the forged 355 kit.

So if I had around $1k to spend on heads, would I be better off with re-worked stock castings, or out-of-the-box Trick Flows?

96capricemgr

iTrader: (1)

You are not giving the stock crank enough credit, more than a few heads/cam cars out there spraying 175+.

Your stroker is not going to perform well for now, simple as that. I understand why you are looking to do the shortblock now and think it a reasonable decision, you just have to understand your heads are going to be the choke and that you will very likely endup redoing them when money permits.

Despite what the bench racers will tell you the stock castings worked by a good shop will feed your stroker, but depending on who does what budget porting now they may not really be any good to send in for more serious porting later. Kind of a tossup here either choice will require more work down the road.

On the cam IMO too big and I have not seen the XFI grinds particularly performing though everyone loves to recommend them.

An Eagle "balanced" rotating assembly should be rebalanced, by the time you are done with all that cost I would look at a Compstar Speedpack end cost will be about the same but the Compstar kit will be balanced much better right out of the box. Think the piston selection is a little limited as I don't think Mahle has a nice d-dish offering so this might make the head decision Trickflow.

At least look into it at Summit looks like the Eagle kit is like $1970, and you should rebalance which I think will be $160+, the Compstar stuff I think retails about $2100 and is Mahle pistons if you look into Compstar it is basically a Callies "budget" line, select offshore forgings with final machining done here. If I had the budget to do a fully forged rotating assembly this is the one I would use.

Built LT1

iTrader: (3)

I just picked up my new 388 cubic inch (4.060 bore 3.75 stroke) LT4 stroker. I decided not to go with the larger crank (3.85) because I heard it was less realible for longevity and huge power production. I have a TNT nitrous kit on the engine already and plan to spray a 250 shot; this will only be for the track with jetting for the street no higher than a 150 setting. I have taken precautions to run that much nitrous. Aside from possibly using a Minimizer program to lessen the shock on the motor, I have an LT4 Block with 4 bolt mains rather than 2 bolt mains. I have a forged nitrated and heat treated Cola crank with forged Manley H-beam rods and custom forged nitrous pistons from JE.

As far as your top end and cam selection, it depends on your head flow, compression, and cubic inch. My cam is a Comp solid roller with a .650 ish lift, 248-254 duration @.050, and ground on a 110 lobe seperation. I don't street race and I am not secretive about my combo, so I have no problem sharing my specs with others on the forum. This cam may not be for you. My AFR heads after serious porting flowed 313 cfm and my compression is closer to 12.0 than 11.0. The heads have a 3/4 inch deck height and use Cometic head gaskets.

If I were you I would go with the 383 setup. Forge the bottom end and select a cam based on your head flow and compression. You should have no problem reliably spraying a 175 shot and going with a larger broken up shot on occasion.

Good luck with your build.

96capricemgr

iTrader: (1)

LT4 block is the same as the LT1 just machined for factory straight 4 bolt and for a serious motor I would sooner go with a two bolt block and fit it with aftermarket splayed 4 bolts which will provide better alignment and a stronger cap. But I just look for results rather than wow factor and a good marketing campaign so what do I know.

For now we already know your heads are going to be the choke in the system because of your budget so don't let anyone tell you you have to match the cam to the heads now, buy the cam that should work well with the later head upgrades if possible. We already have a pretty good idea of what the various LT1 head options flow at what lift so the "match the cam to the heads measured flow" is grossly overrated, anyone helping you pick the cam should know enough to make reasonable assumptions on what the eventual heads will flow and at what lift.

Or you could just blindly throw money at whatever sounds cool .

94Z396

Question! So your saying a 396 or 398 cubed LT1 will wear out within a year?

Built LT1

iTrader: (3)

Who are you asking?

redneck01

iTrader: (3)

I wouldnt think so...it depends upon the cooling system, driving conditions, and oiling system..but i'd say the same as any other engine, depending upon how you drive it.

BlackScreaminMachine

iTrader: (17)

Short-Block- I ran Eagle H-beams, no issue, didnt run the crank due to rebalancing issues Big Block T/A ran into that issue, I would just be prepared to spend more money on balancing. As for pistons run a JE piston, no silicon in the construction so it will resist detonation better and not shatter as easily. As for rods (if your running -16cc dished slugs), then your running a 6" rod. I work just for the sake of the ring land location the wrist pin, run a 5.7" rod.

Heads- Trick flow are good peices, I would have them milled good, Lloyd elliot does good work and when I was deciding on reusing my cnc ported lt1 castings there was an issue with the -16cc pistons and the combustion chamber of the heads, you should be able to run with a 5.7" rod, flat top pistions and a little milling to give you a comp in the 11 to 1 range which is good for juice anyway.

In would contact Lloyd about the cam, since he works with Bret on the grinds, he can find you a good heads and cam combo that will work well with the 383 block.

SprayedLT1

iTrader: (8)

Hey Aaron, it's Aron (BlueN2OCamZ from Fbody.com).

Thanks for the info guys. I think I'm going to just go to a few local machine shops and talk to them about what I should do. If I can put together a solid shortblock with the stock crank and just use good pistons and rods, and save a lot of money compared to the stroker, that's what I'll do. But, if the stroker is only going to cost a couple hundred more, I may as well spend the extra $$. Whatever I end up doing for heads, they will be re-done next year anyway, which is why I'm leaning toward TF's for now. I just don't have the funds to do an awesome head now, and if I did, they would just be sitting on top of an engine bolted to an engine stand. At least with shitty heads, the car will be running...maybe not as good as it could, but I'll be able to drive it.

BlackScreaminMachine

iTrader: (17)

I knew it was you I saw the sig pic If money is tight, thats the way it goes but i'll say this, I dont know your time frame but my 383 is coming up for sale, I plan on putting new bearings (cam, main and rod), rings and possibly pistons which will be SRP -16cc dished units, the same I had before, im still figuring out a price the piston alone are like $550 But I dont sell junk, its got 4 bolt splayed main caps, eagle h beam and callies dragon slayer crank.

let me know what your planning on spending on the short block.

My short block is close to this.... http://www.golenengineservice.com/sp...383compsb.html
which goes for $3600 not including shipping.

Something to think about, just putting feelers out there If I get someone hot, ill put it back together to ship.

I just got my headers for the transam and I am putting the 12 bolt in

97M6Formula

iTrader: (6)

Just to give you a ball park my 383 Had stock home ported heads and a 236/245 114lsa cam 11:5:1 compression and made 392/392 rwhp through a 9 inch and a six speed. It took the juice very well too the most I sprayed was 150 but I gained almost 180 ft lbs from it