Ok I talked to the guy again we have some things set up for a shortblock, price seems pretty good. I just need to know after he sets up my 383 shortblock with 6" rods is there anything I need to to tell him so my ported heads and cam I get elsewhere will work, or so that the people that port my heads need to know so it will work with the 383 he builds? I want the cam and heads elsewhere so the 383 will already be complete before I get the heads.

Here is a rough sketch of what the shortblock will contain, any ideas are welcome (he said he will use 6" rods instead of 5.7 and I beam instead of H beam as I have been adviced in a previous thread)
> speed pro forged pistons
> eagle forged crank
> speed pro moly rings
> eagle forged i beam connecting rods
> clevite 77 h series rod and main bearings
> fel pro gaskets
> roller lifters
> timing set

That should be good for a 150 shot without any problems right? (dont really need to go higher, but I want 400rwhp before spray)

Also im planning on going with LE3 heads I guess, lloyd will use my lt1 heads as the core right? And that includes a cam but he doesn't give cam specs, does he custom build the cam?

 

Yeah the set-up will handle a 150 shot of nitrous here and there really well.

I like the set-up you are using , its not "top of the line" stuff , but is proven to work very well. Which Speed Pro pistons did you use?

You will have to ask LLoyd about the other stuff.

I think you'll make your goal easily though.

 

Thanks, the guy needs my cam to finish the job and im short on budget in the short-term so I have to find out about the cam situation. If i need it to be made custom for the heads to get the best results, and if so, maybe I can get the cam made to an "estimate" of what the heads will flow so I can send the cam to my builder to complete the engine. Let me find out the series of pistons hes using so you guys can give your 2 cents.

 

talk to Lloyd, he can get a custom cam to fit your LE3 heads he is making for you and grind it for NA/n2o (NA being primary of course ) You also want to decide your compression ratio before you start all this, cus the amount of material you take off the heads and block will effect your CR. CR also determins what fuel you will be running. I will be going with a 11.0-11.2 CR and will be running 93 or 94 octane fuel. I am using a set of -16cc dished pistons, 54cc stock lt1 casting heads ported.... If you use flat top pistons you mite be to high on your CR, but then agian not sure when the CC of your heads will be after lloyd gets done with them....Best advice I can give you is, dont jump into it all at once, build it once.....the cam is the least of your worries and comes LAST.......build the bottom end first and then travel up. CR is very important....PM me if you have any questions, like i said im building a 383 also and will be running n2o, and its a street motor, its almost done...PM me or email me, I am on AIM also.

 

Well I do beleive he was going with flat top pistons, how will I be able to predict the CR? Will it mostly depend on the heads? better flow heads mean less compression ratio? I plan on geting the LE3 from lloyd. Let me know asap so I can have him start building it, thanks. Also what is the highest the compression ratio would be with flat pistons apposed to dished? Should I request dished pistons instead?

 

The engine builder should tell you what you need for your target CR. better flowing or less flowing heads have nothing to do with CR per say, its the amount of material taken off of the heads, the head gasket and the dome, flat, or dish of the piston.... its the less space between the head and the top of the piston...dish piston will lower CR, flat will raise it, and dome will raise it more.....gotta find out the CC of the heads first (prob 54-56cc) depends on how much has to be taken off to deck them, and with a .036 gasket you will be where I am 11.0-11.2 or so CR with -16cc dish pistons....Ask lloyd what CC his heads are after his LE3 port....cus with 54cc heads, -16cc dished pistons, and a .036 cometic MLS head gasket I am like i said, about 11.0-11.2, with flats, those heads, and that gasket you will prob be in the 12's prob, way to high to be running pump gas....there alot of static CR calculators on the net, search google for one, put the info in and you will see what u have to play with..

 

well our pumps here have 93 in them, if thats not good enough then I guess I can try to get dished pistons, problem is the block will be done before the heads, should I play it safe and ask for dished pistons ahead of time? or think I will be ok with the compression?

 

If its close to 12:1 with a standard gasket (dont go skinny) and you get a cam with alot of overlap the working compression ratio will be more manageable and with a good tune the 93 should work. But if it is much over 12:1 it will be very very hard to run 93.

Have you already purchased the heads? If not I would look into some alternatives, a cheap bigger chamber head is the trickflow, if you have lloyd port them you will probably be out another 800$ , but it will prevent you from taking the motor apart again to change pistons.

 

What do you mean by it will prevent me from taking apart the engine again? Were you referring to if I got lloyds or the trick flow?

I was going to go with lloyds anyway, does trickflow lower the compression or something? I don't know, but im going to have to purchase the engine before the heads, I just hope I can manage the CR afterwards.

 

Since you have flattop pistons your compression ratio will be on the high side with a 53-58cc chamber, the trickflows have a 64cc chamber which would lower it about a good point.

A good cam can lower your working compression ratio though. Ask your engine builder what he thinks about the compression.

 

Figure out your DCR with your advertised cam spect's NOT@.050.
The static compression don't mean s*** it's the DCR that makes it rattle.
You CAN run 12.5 on 92 octane depending on the cam.

 

The bottom end is the least of his worries.
There are not many people that are up to speed with LT1 motors. When I tell people the car, stock, has 10.5 :1 for compression, they all say that I have to run race gas. The lt 1 with better combustion chambers and reverse cooled heads can easily handle the higher compression.
Your Dynamic Compression Ratio is very important. Who cares where you are at with static, granted don't build a 14:1 CR engine.
Lloyd can do a custom cam for you in the package price. Before he will design the cam, though, he will need to know PISTON CC, ie. flat top, dished, etc...) and what your deck height is going to be. I have a perfect quench of .036 which is going to make more power and torque than a quench of, say, .062.
I see you are still asking some questions about Lloyds heads and cams, so I take it you have not called him yet. I can not stress this enough but CALL HIM!!!!!! If you are indeed going to go with the LE3 package, he will design a cam for you. Let him recommend the parts, i.e. piston cc, flat top, dished, etc. So lets say he says to use a 12 cc piston dished. When your machine shop puts the engine together, they will most likely deck the block to tru up the head surface. He will then need to measure how far in the hole that the piston top sits from the deck surface. From that point, you pick your gaskets to get you the ideal quench and do your final calculation for static compression, unless alot must be taken off your heads to tru them up or you WANT higher compression.
With all this info, the cam can then be designed. This is how they can change the dynamic compression ratio to what is best for the engine. 9:1 is going to be really good on pump gas. Buying taking into account the valve timing events you can bleed off cylinder pressures, hold it closed longer, add a little overlap, etc. Between the cam and heads, thats where the real power is going to be.
You mention nitrous, this will probably be a factor in your cam selection as well. Do your self a favor and call Lloyd. He can and will point you in the right direction. Bret Bauer (sstrokerace)is another guy on here that knows his stuff and works with Lloyd. In fact he designed my cam thru Lloyd. I have spent(wasted) money buying parts that would work, but not work well together. Every part needs to compliment each other and work based on your intentions for the car. Do your homework and get the head and cam stuff taken care of now before you commit to the pistons. A phone call is all you need and you'll be on your way.
This has been all based on my experience by working with Lloyd and to hear the "testimonials" of others on this board about Lloyd and his work.

 

9/1 DCR is about the limit on pump gas not 9/1 static.

 

Thats what I said, or wrote or ....meant