1991z28L98

iTrader: (1)

OK Its time for me to put up my specs up and get some opinions and help.
383 4bolt main
4.030X3.75
Ohio crankshaft 4340 forged crank and 4340 6" H beam rods 2000 arp rod bolts
SRP racing pistons metric rings Spiro locks tool steel wrist pins -5cc two valve reliefs
and the pistons are .021 in the hole.
Comp cams xfi280HR13
2-6k (230-236 @.050" lift and 576-570 lift) 113° lobe seperation
scorpion racing series offset 1.65 RR
Green giant 42lbs injectors
TPIS Miniram fully ported throughout and matched to felpro 1206 gaskets, and a 58mm bbk throttle body ported to match the intake.

Heads are 222cc with 2.055/1.6 valves by Chad Speier (Speier racing heads) he starts with rough cores before extensive rework milled to 66cc to give me right at 10:98:1 with a fel-pro 1094 .015 MLS head gasket.
Holley HP EFI engine management system duel wideband O2's and MSD distributor with 6al2 box and Taylor wires

Backed by a Maddog Transmissions built 700r4 3600rpm Yank SS lock up stall and a Dana 44 with 3.73 gears 3" aluminum driveshaft.

PA Racing tubular front k-member ( Front motor plate no perch mounts) and control arms coilovers all the way around S&W subframe connectors and TQ arm umi adjustable panhard bar Founders panhard bar relocation bar Founders control arms with umi relocation brackets welded on.

How am I doing guys lol this is a street strip car some street racing running ET DR's.

Untamed Z

Personally I think with all the top notch parts you've listed, you should dump the LTR in favor of a mini ram. With your current setup, your intake and cam won't be working in the same RPM ranges. LTR is good idle to about 4800 and your cam is going to be good 2500-6000. In a nutshell, about the time your cam starts to come in, your intake will be falling off. On the positive side, it won't matter on the juice, but I don't think it will perform well on motor alone.

Untamed Z

And I apologize for not answering your original question, but regardless of what heads you choose, I don't think it will perform well on the motor with that camshaft and LTR's.

1991z28L98

iTrader: (1)

Trust me I wouldn't mind a mini ram or a mpfi set up but fact is I have the ltr set up And trying to find a Mini ram or MPFI set up as trade would be hard will I change it one day you bet but for now I'm stuck unless someone has a trade or a used set up for sale... thanks untamed z

1991z28L98

iTrader: (1)

OK so it may take me longer to finish my car but selling off my set up will help fund a mini ram and with all the money I've got in the engine trans and rear I should spring for a better intake. Posted in classifieds as TPIS big mouth

So that leaves me with the heads 210cc pro-filers from chad at SRH ???
will I be able to make it with .036 quench some say yes some say no ???
The cam will stay for now until I can afford to get a custom grind from mike Jones is 15 min down the road... anything else needs attention???

1991z28L98

iTrader: (1)

Updated alot of info I think I have all my bases covered

Orr89RocZ

iTrader: (20)

Strong combo. Hope the heads have good springs for that cam lol i know chad probably set them up well. That cam is aggressive with a 1.65 rocker and needs great springs for control over 6k rpm. Should be a monster tho, well over 400 whp

1991z28L98

iTrader: (1)

Springs are good to .680 and chad is good I was going with a set of profilers before he pointed me in the direction if these on his page a guy made over 500hp with these heads on a 383 street engine

1991z28L98

iTrader: (1)

Preview for my heads hope to have them by christmas

Chad Speier

iTrader: (1)

1991z28L08, look at this! A certain guys Dart CNC heads!

1991z28L98

iTrader: (1)

You are the man how did I not know you were on TGO

Chad Speier

iTrader: (1)

I've been checking in every once in awhile and decided to register.

Orr89RocZ

iTrader: (20)

Welcome Chad!

TTOP350

iTrader: (8)

Only 1 thing I see wrong, I think you should sell the dana to me and get a 12 bolt or 9".
lol
J/K looks like a nice setup, go get em.

1991z28L98

iTrader: (1)

Welcome indead chad its a real treat to be getting heads from you for my third gen this being my first big project I own I really look forward to bringing my baby to life!

And ttop350 I got lucky with that rear had it shipped from MD to NC a long way on a pallet lol

Chad Speier

iTrader: (1)

Thanks Guys, good be here!

Here is the data on the Dart head, v2.45DA/23º

Same CNC program that has made 655hp on 383 drag engines and 550hp on 383 street engines. Dedicated small bore.

4.060 fixture
Brezenski 1206 plate
1 7/8 pipe
2.055 w/30º BC
1.600 exhaust
90.5% throat
2.42in² pinch
222cc

.200 144/106
.300 205/144
.400 253/179
.500 278/206
.600 293/222
.700 297/234
.800 302/243
.900 305/250
1.00 308/255

1991z28L98

iTrader: (1)

Thanks chad for posting up the flow data on the heads I hope to get the rest of the engine Together and ready for the car as soon as the heads get here. and the car ready for the drivetrain this week

1991z28L98

iTrader: (1)

Hey chad do you happen to have the build specs on the street 383 that made 550hp?

Chad Speier

iTrader: (1)

He copied this but it had a Hurricane manifold.

http://www.1320techtalk.com/viewtopic.php?f=8&t=2616

1991z28L98

iTrader: (1)

Thanks for the info chad

1991z28L98

iTrader: (1)

Looks like I'm going to swap to end quay long tubes to complement my heads should work out great

DeltaElite121

Chad and I are also working together to get more Dyno information for his page on these heads. In my case, I have chosen to guinea pig my street/strip 355 because that is what most people on here have/can afford. We will also be looking at some direct correlational differences between the camshaft I have now (solid flat) and a solid roller cam designed for the heads, which I will also Dyno when I've got the extra change to push towards it. Research is awesome


Looks like you're on the right track. Just keep taking your time with things doing it right and you're going to be more than pleased with the results.

86LG4Bird

iTrader: (1)

1991z,
I know I'm late to the party here, but I'm curious as to why you picked that cam with such a wide LSA for NA operation. I understand that when the heads flow exceptionally well, you can do this and still make good power (a la the late-model LS engines) while keeping some level of emissions and idle acceptability, but there's usually more power to be had by tightening it up.

1991z28L98

iTrader: (1)

86lg4
I had this cam before I got my heads I'm calling this car my snowball build every plan I had for the car has changed along the way except the CI of the engine and keeping my 700r4. I agree there is much better cam choices and I plan to take advantage of that but right now I'm not to the point of getting the car on the road and seeing what she does on the chassis Dyno take all the info I have and have a custom cam ground mike Jones is here in town and I've got his input on this on cam options and have that in the works when a custom cam goes in so will the juice.

86LG4Bird

iTrader: (1)

Gotcha
Just so you know, I'm not a cam snob. It's almost comical how people agonize and argue over minute differences in valve events and then completely miss the boat in getting other parts of the build right.
Was just wondering what led you in that direction.
I'm sure it will still show some good power.

1991z28L98

iTrader: (1)

This car is by no means a dedicated drag car just a fun stock looking from 10ft anyway all factory interior even factory paint the only aftermarket part you can see is the shifter until you open the hood Im just building a hot rod with enough get up and go to shut my Buddy's up lol down the road I'll work on a cage and mini tubs and more serious weight reduction

1991z28L98

iTrader: (1)

Added a spohn bump steer kit to my front suspension and got a front motor plate Its a sprint cup style so fab work to come no traditional motor mounts for this build

1991z28L98

iTrader: (1)

ED Quay long tubes came in today 1 3/4 stepped to 1 7/8 fully tig welded and no complaints there 3 inch collectors with cones vbands go on next and cut the flanges test fit then off to be coated.

90camaro355rs

Like the build list, really like those headers! cant wait to hear it pur!

TxTtopZ

Sounds like a nice combo... keep us updated.

1991z28L98

iTrader: (1)

Back home where she belongs

VincentZ28

iTrader: (2)

I'm doing the same combo except I'm using fully ported Trickflow heads with 2.05/1.60 valves with the 280xfi cam and Miniram. Oh by the way. I have 2 Minirams. One is for sale. I using the 280xfi cause the other cam grinders offered very similar grinds. I could have went bigger like the ZZX cam in which I already have but I can't get pass the sniffer with it. Besides I'm driving a T5 Trans. The ZZX cam is not that good for street driving with a stick at low RPMs. I can pass smog with a 280XFI.

1991z28L98

iTrader: (1)

With the 280xfi cam we installed it at 0° instead of 4° retard should add a few hundred rpm to the power curve and I'm not worried about sniffer test

1991z28L98

iTrader: (1)

V-bands for the slip fit collectors

1991z28L98

iTrader: (1)

1991z28L98

iTrader: (1)

-=Z28=-

iTrader: (3)

Getting closer!!!

cardo0

Some one help me out here. What does LTR mean? Mini rammed LT1? Thats
not what im seeing in the pics. I see a mini rammed GEN I block.

1991z28L98

iTrader: (1)

LTR = long tube runner, factory style tpi when I started my project I had a highly modified long tube runner design then swapped to miniram intake by TPIS.

cardo0

Ok got it. Thx.

Another Q is why did u go TPIS instead of HSR? That mini ram aint cheap (though the HSR isnt much cheaper is it). But i read better results with the HolleySR. BTW if u get the chance can u measure the mini ram runners. I measure only 5" on the stock LT1 intake (and only 5.5" on the short turn of an Edelbrock Victor Jr BTW).

1991z28L98

iTrader: (1)

There is another thread about this its old but the info is the same stock lt1 is 3" runner lt4 is .100th longer and the miniram is 3.5. HSR I'm not 100% but they are longer than that, longer runner= lower rpm range in these style intakes due to having a plenum (upper intake area) Victor Jr (single plane I take) places everything in the center and work completely different than the intakes were talking about. I went with a mini ram because 1 I needed port work regardless and didn't like the 2 part intake of the holley for this or for future N02 plans. My intake ports are felpro 1206 and a factory lt1 or lt4 intake can't go that big and the hsr would be pushing the limits. The amount of time and machine work I would put into the lt1-lt4 was unappealing as well along with not enough room to port and Im a Machinest lol. I'll eventually sell my miniram and go single plane intake more room to grow different cam options that I like better and better fuel and N02 distribution. (I also bought my miniram and fuelrails used due to needing the port work, traded a few things too. I have maybe $800 in it including full professional porting that includes 1206 runner matching TB area 58mm and bad casting spots in the plenum also included some light porting of my bbk TB.) Keep also in mind I tried to do every little thing I could that would help me now and down the road to make the best power i could. The miniram and its one piece casting made for a better match for the direction I am going and my heads. Hope this helps

cardo0

Thx L98 your advice did help. I guess i didnt recall correctly. Im reading else where the LT1 is only 3" long. Hmm, i need to get my spare out of storage and measure again. Interesting stuff though and i think i can spend hours on the internet just reading about them.

Well i always felt that GM copied the TPIS mini-ram for the LT1. TPIS says it still out performs the LT1 intake. But there are a lot of happy HSR owners out there - it just looks plain bad azz too. I think how much cam u run and rpm u make compliments one intake or another. With my small cam i would rather run a converted to EFI dual plane intake using an air horn/elbow inlet. And just for the fun i may try it someday but it looks like i need to get my traction problems fixed first - i dont need any more low end right now.

1991z28L98

iTrader: (1)

My Dana 44 only has to last a little while I've got most of my parts together for my ford 9" jig I can by a fab 9 kit weld it in my jig with 3.5" or 3" axels back braced choice of length and axle flanges, backbraced and its jig welded with the ends alighned with center bearings. 1/4" or 5/16" thick brackets for tq. Arm and control arm relocation brackets and coil over brackets or spring pads. Of course my car will be a test dummy for a chromoly version first one I make.

cardo0

So u have one of those vendor Dana 44 rears that GMPP sold and then sold by Summit and others? U should get a few bucks for that if u try and help offset the cost of the 9". I think installing with your own fab kit makes it a very reasonable swap.
Now one of the camaro parts vendors is selling an Ford 8.8" for the 3rd and 4th gen camaros. Very competitive price also and thats the route i will go when i upgrade my 4th gen. Im surprised my stock 10 bolt has lasted this long but i did put a T/A cover with tension bolts on it. And i was looking for a Dana or even a Australian 9 bolt rear but everyone that has done a 8.8" conversion loves them.

Good to read your project is moving forward with some heavy duty parts.

1991z28L98

iTrader: (1)

I have a friend that's doing a 4.8ls turbo build along side my car about the same amount of progress, he did his own 8.8 with what he calls a mini link its kind of a cross between factory control arms and ladder bars. And my dana44 came as factory GM replacement from a dealership in the 80s before GM sold the Surplus to SLP. I spoke with the owner of the car it was in and he originally replaced it through the dealership when he roasted 2 10bolts. Back Then it was a few hundred extra bucks on top of the warranty claim for the 10bolt.