Thread: 383 build-Something Caught My Eye

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I read where Jerry said on a 454 build that a engine at 9.0 compression given the wt of I think it was a truck would be a real"dog".Been yrs since I heard that term and I am saying that much to Jerry's credit showing the yrs of engine building.It was certainly a awake up call to me.I had posted a thread about my 383 build intent and despite Pat's,Jerry's,Dave's and everyone's else best advice insisted I wanted to build a 9.0 383 to the extent I wanted to special order Mahle inverted dome pistons at a little over $700. to run 87 gas for my towing/toy/conversion 1989 Astro van.

So all that said above,It is my way of saying a big I'm very sorry to all of you for not listening.

Later today I have the gun loaded to purchase pistons to get this build on the road so to speak.With Jerry's comment and I looked at the price difference between 87 and 95 gas beening only on average $.13 to $.15 cents convinced me I should look at doing this another way.Lastly this is likely my last build at the age of 64 and surely don't want to disappointed and be stuck with it.

The only two things I am saying is I will not buy anything Eagle and the heads I think I want to use are RHS Pro Action cast iron heads.

The block I have is a L31 four bolt roller.I want to buy today the pistons,rings,pin and would need part numbers and source.I need a set at a compression ratio that I won't have to worry about pinging using 95 gas

With hat in hand guys,

Thanks,

Gary

Oh maaaaaaan-you want to see a old man cry??.Really guys I am sorry I didn't listen and take the advise given.

I went back and did a search to see what we had talked about this before.It might be there,but I can't find it.What I was thinking was to move up from a 9.0 c/r to a 9.5. static c/r Comments??.


Again guys,it wasn't here or anywhere else on the forum my intent to offend anyone at anytime.If that is the case,I am very sorry and just want to get be in the good graces of the community.

You need to think of the whole combo before ordering anything.
What cc heads are you planning to use is a must know. I see this head comes in different volumes.
Camshaft?
If you're looking for torque and low revs a mild cam is in order.

Thank you for your reply.I am having doubts about the whole concept of what I thought I wanted to do to build my 383.

This is what at first the cam I thought of using:

GM part number 14097395 hydro roller

288/308 duration @ .050 tappet lift

196/206 max lift 1.5.1 rocker ratio

431/451

with a centerline of 109

Is that the wrong cam??.Too small??.Suggestions??.

The heads I am thinking I wanted to use is:

RHS Pro Action cast iron

180 intake runner

72cc chamber

Too large of a chamber??.Should I look at the 64cc's and a bigger intake runner like the 200cc??.

The pistons I thought I wanted are:

Mahle special order dish part number SBC42530I26.That would work out with a .040 head gasket and not 0 deck to be 9.0.

Costs is

$693.95 plus $18.00 S&H.Everyone has told me I do not need that for what I want to do.I agree.

Pat told me about SRP's and I can't find that ref anylonger.

What I was able to find on SRP's was in Competition Products and in one case it didn't include rings and in another one it did,but the costs of both wasn't far off in the price of the Mahle's.All of the pistons are forged and for what I am doing here I don't think I need that.But I certainly am open to suggestions.

So I looked at the hyperutectic's.

Speed Pro and Sealed Power seem to offer the same piston.Coated with moly rings. and a .110 dish.Question here is are they both owned by one company and just named differently???.I am guessing they are both owned by Federal. I am not sure if it is at 0 deck would be with 64cc heads 9.6.1 c/r and that is a ref in comp's catalog and I am not sure what head gasket they are using.

The rest of the info is a tranny that is a 700r4 with a stock converter,a Ford 9" 3.70's rear end ratio with a van who's wt is in the low 4,000lbs.It is a TBI injection.


I don't want to make mistakes and end up spending my hard earned dollars building a dog hating it for the whole time I own it without a easy fix buying the wrong pistons,heads,cam and still want to run it on pump gas without needing to use a additive.

i told you not to build it with a 6 inch rod and the short skrit mahle piston s as you were looking at a race piston for RV use and they are a wast of money for this build . has for the CR you do not want much if your pulling with it. the gm cam works good it a TQ cam and that is what you need but it may not like to much CR there is cams that can be made or shelf cams out there that could work abit better

Thank you for your reply Pat.My question is what c/r should I shoot for and maybe which pistons I should buy??.

Given a piston choice,which RHS cast head should I get??.180cc or 200cc-64cc or 72cc??.

I would be interested in hearing more about a cam that is a little better.A shelf built or maybe you could PM me with one of your custom builds and costs.

Again,Thank You.

what is the RPM of the engine if it is low rpm i would stay with a smaller runner no bigger then 180s as for cam it would be late in the week end or first of the week for cam s or custom grind numbers . the pistons i would look in to the KB I con s and the RHS pro torkers are a copy of gm v heads and 170.. i would used this head see if you can get in the 72cc chamber i would have to run the number 9.8 cr with a 64 cc head is abit more then i would build in to it if going to pull a load less you putting good gas in it all the time ? this is a carb engine or tbi?

I can call RHS early next wk for Pro torquers.Actually that is how I found the Pro action heads with a 180cc 72cc and got a part number for that.It wasn't listed in any catalogs.The main trailer's wt is for my vendor trailer and that max is 3500lbs.With a 700r4 I can't tow in hilly area's in O/D.So it would used in third most of the time and I plan on a Ford 9" conversion using a gear ratio in the range of 3.70's with a 29" tire.I was thinking of a torque range starting in the 2,000's and hoping to have as broad a torque band as I can.I thought I wanted everything peak wise(torque/hp) below 5,000/5,500.I read that com cams put together a spider lifter system to replace the O.E.M. units because the OEM are very limited in RPM.I don't know if that is true or not.I was thinking I wanted to use a TBI/TBI Chips Inc unit.The cam spec's I can wait for a little bit as long as I have mapped out a game plan,but would buy to have on the shelf to have when needed.

Pat,I'll look at the KB's.I am guessing you opinion is the KB's are a better route for me than the Speed Pro's or Sealed Power coated.
-110 dished.Am I right??.I do want to order the pistons as soon as I know which ones so I can get the machine work started.I'll go with your suggestion on the KB's.Just curious about the Speed Pro's or Sealed Power.


Thanks Pat.











Thank You Pat.

I can call RHS early next wk for Pro torquers.Actually that is how I found the Pro action heads with a 180cc 72cc and got a part number for that.It wasn't listed in any catalogs.The main trailer's wt is for my vendor trailer and that max is 3500lbs.With a 700r4 I can't tow in hilly area's in O/D.So it would used in third most of the time and I plan on a Ford 9" conversion using a gear ratio in the range of 3.70's with a 29" tire.I was thinking of a torque range starting in the 2,000's and hoping to have as broad a torque band as I can.I thought I wanted everything peak wise(torque/hp) below 5,000/5,500.I read that com cams put together a spider lifter system to replace the O.E.M. units because the OEM are very limited in RPM.I don't know if that is
true or not.I was thinking I wanted to use a TBI/TBI Chips Inc unit.The cam spec's I can wait for a little bit as long as I have mapped out a game plan,but would buy to have on the shelf to have when needed.

Pat,I'll look at the KB's.I am guessing you opinion is the KB's are a better route for me than the Speed Pro's or Sealed Power coated.
-110 dished.Am I right??.I do want to order the pistons as soon as I know which ones so I can get the machine work started.I'll go with your suggestion on the KB's.Just curious about the Speed Pro's or Sealed Power.


Thanks Pat.

I almost forgot.You asked me about the good gas.If I ended up running the 95 gas over the 87 gas,I looked at the pricing and I would run 95 gas if needed.

If the post shows up weird,I had a problem with my computer for a edit.

72 cc heads with a 12 cc piston, zero deck, .040 gasket will give you 9.37:1.

Here's a calculator:

RSR Static Compression Ratio Calculator

Keith Black:

KB Pistons for Automotive Applications

Originally Posted by 1gary

I almost forgot.You asked me about the good gas.If I ended up running the 95 gas over the 87 gas,I looked at the pricing and I would run 95 gas if needed.

Gary,
Can you still get 95 octane gas in your area? Around here, and through much of the surrounding area the Premium is 91, and occasionally 93. Lots of stations only carry two grades, and many that do carry three have 87, 89 and 91; some 89, 91 and 93. Just saying you may not get your 95 octane as you travel too far away from your home base.

Thank you 123 pugsy to the ref.

Roger-I was assuming that 95 gas was still around and you are probably right that I don't have that even here.I'll have to look.Good point.

Given what we have talked about here without a custom grind cam but with the GM cam,could anyone ballpark the torque/hp numbers for this engine?.I am going with Pat's spec cam and whatever it is,it is, because it is the type of build I need,I am just curious what those numbers would look like.

Thank You guys.

i am a dealer for RHS now let me look and see if they show that head in a72 cc head as for a custom grind you looking less then two weeks from the phone call it they have the core . ever thing would be drop ship to you . the stock lifters should do fine at 4500 if going past that then better lifters .low rpm max Tq lower cr so you can run so/so gass .tbi is going to be hard to run any cam you do not need big DUR any way s the map will not like it i do think we talk about this before ? i have been abit under the weather .so it some one wants to work this up i under stand. i will give you numbers monday the Kb I cons are a nice piston for the money .seal power in a coated hyper would be fine i used many. they work fine now they got all the bugs work out from shipping the piston line to inda

The KB's I looked at on their site with a -12 dish that they call a 383 is for a 4" bore.Actually pretty common term to call that a 383 too.The part number they used is KB193.With that the c.i. given borex10746666666666667x3.75x8=376.991.Mine is going to be a 030 over which =382.667.So I took that volume for a static compression ratio and plugged that in at 0 deck with a .040 head gasket.It worked out to be 9.4867.

Engine Compression Ratio (CR) Calculator

That is getting closer to the 9.5 C/R.Should I be concerned about that??.Pat would that be acceptable??.Should I drop the 0 deck cut and just have the machine shop square the deck for a good ref point??.

Thanks guys.

Hope you feel better soon Pat.