Street89vette

10.70-1 CR , HSR, 210cc, w/ 383 build ,with 3k stall.

XFI with 113 lsa?

Comp 291THR7 with 107 lsa?

110 lsa for 2-6500 rpm
108 lsa for 2-6500 rpm?

236/240 duration?

cardo0

You want a wide LSA like at least 112 to work well with the computer. Search a dynamic compression ratio calculator you can use to select a cam with the duration to match your desired dynamic compression ratio.

You are making this to difficult unless you want someone else here to do all the math for you. You built the motor and your calculations will only be as good as the static compression ratio you measured - if you bothered to do so. No one else can magically determine you head chamber volumes and the above piston volumes included the gasket compressed height.

Or well you can take best guesses from the faceless internet all day long. Good luck with that.

Dirttracker

Would a 108 lsa be more streetable?I don't want to have to use a stall and a 12:20 car is all i want.

Beach Bum

If all you want is a 12.20 car.... then sell the HSR, put on some ASM long tube runners or a used superram intake, put a tight 2400 rpm converter, hence streetability will be docile..... you could run the LPE 211 or 219 cam, both very friendly and on a 112lsa..... your car would drive smooth and pleasant no matter the situation.

And quite frankly, you'd probably still run in the 11's.

good luck with whatever direction you go in.

Pwnage1337

I run a setup like yours, 11:1 CR 383, HSR, 200cc heads, 3200 RPM stall, 280XFI.

Spin it to 6000 and love it

Dirttracker

I have been out of the racing scene for 20 years and decided i need the speed.HSR stands for?I have 2 motors that just need to be machined and put together...350 flat top motor with 6" rods and a 408 flat top with 6" rods.I want to be able to cruise 30 miles without problems and have street racing power.Any help is mucho appreciated

KSA Aaron

Beach Bum - you are still around? I haven't seen you post in ages.


My old screen name was AKS Racing and you used to offer advice when I was in the deep 10s. Assuming you moved on to bigger and better vettes judging by your pic.

Street89vette

thanks cardo0, measured .022 deck height, ring gaps avg .014-.016, 4.030 bore, 3.75 stroke, 64cc, 210cc, calculator 10:7-1 cr, .030 head gaskets .0020 mains, .0030 cam to rod clearance with oe base circle and .500 lift @ 1.,5rr degree wheel and push rod geometry next week. I actually love the math but i know racers are The source of Knowledge on great setups. OCD but ok with it. ps: for dirttracker: HSR "holley stealth ram" OCD "obsessive compulsive disorder" lol;: laughing out loud.

cardo0

That helps but there is no information on the piston valve relief's or dish or done. And head chamber volumes can vary alot from advertised. Best method is to measure both the head chamber and above piston volumes with liquid.

Next step would be to find a dynamic c.r. calculator that you can use. Expecting someone else to crunch the numbers for you on the faceless internet is begging for error. Now you could ask someone to verify your choice and discuss how to determined what you got. Myself I don't have that much free time and wouldn't try it even if paid to do it as I just have more interesting things to do.

Good luck.

ddahlgren

You could both crazy and obvious and call the cam co. and ask for a recommendation and how much converter it needs.

Wheel Stander

My 383 has 11.2 to 1 compression, LE 2 heads, Lunati cam 231*/239* duration .571"/.589" lift, A4 trans, 3400 stall, 4.10 gears and lousy Nitto tires but still runs 11.70s all day even with a ridiculously poor 1.9 second 60 foot time. Better tires and better driving should give me 11.30s or better. That said, she is still very easy to drive on the street.

Street89vette

Just finishing short block torque and clearance specs tonight. Building heads and intake next weekend.
Cam clearance on stroker rods should be ok under .600 lift but have not found cam.
here is my exact setup on summit compression calculator. not sure if it is static or dynamic ?

Bore: 4.030
Stroke: 3.75
Heads: 64cc
Piston: +5
Deck: 0.024
Gasket: '020 still pending.

Compression Calculated @ 11.0-1
Stall: 3000-3200rpm
Auto: new rebuild 700r4 + shift kit 700-2-3 (oil cooler)
Header: long tube
Intake: holley stealth ram

210cc heads 2.02 int
Flow Numbers
Lift Intake Exhaust
0.100 67.9 52.2
0.200 142.2 110.8
0.300 193.6 160.2
0.400 238.9 197.7
0.500 272.7 223.9
0.600 295.1 235.8

flowKooler water pump
cchampion 3row
high pressure oil pump
7qt moroso pan
dual fans 2800cfm
1.6 roller rockers

Camshaft :??? xfi280? Lpe219? xfi292? any suggestions appreciated

GREGGPENN

Wow....a 1/4m track racer recommending long tubes. Wonders never cease!



And here I was thinking of pulling my mega-ported semi-siamesed SLP runners in lieu of an HSR!!!

Street-only 383 application with a 6-sp, AFR 195's, and SR cam.

KSA Aaron

What are the SR cam specs? It is not often that you hear of someone running a solid roller cam with long tube runner TPI set-up. This is a first for me.

cardo0

Well when I use Summit's c.r. calculator using your specs I get 10.74 static c.r.! That's quite a difference. And what I've been trying to say is that since you have the block on the table/stand you could get very accurate volume measurements (using liquid) instead of using published specs that can be unreliable.

If you must I suggest a simple dynamic calculator to try several different cam profiles for the dynamic c.r. that you want. I found this calculator by United Engine Machine that looks to be as simple as it gets: https://www.uempistons.com/index.php...3c8dd514d00dd2

I hope the link works for you. Good luck.

GREGGPENN

An 89 isn't solid roller. Did I miss something? Looked again and didn't see "solid" listed in this thread until your post.

Here's the official link for the SR cam specs...
https://www.lingenfelter.com/PDFdown...L210035087.pdf

Street89vette

yes, re-calculated and used the one on your link... works better. Are you using water or oil or special gel for the cc measuring? finished short block tonight and mock build to check intake ports matching. start cutting hsr down to fit under hood next week. LPE219 really as good as forum says?
moroso pan hits against oil pickup... 8.25 pan... 8.25 pickup. lol

cardo0

I use alcohol with food coloring in it. If you can find 1/4" plexiglass you can make your own cover and drill a hole with a nice wide chamfer on it. I'm still using the plexiglass plate I bought decades ago and I think it was a Comp Cams kit but you can find the graduated (ml) cylinder on line. I asked the pharmacist at Target for some graduated syringes (no needle) and got a handful of 5cc for free.

I use petrol jelly to seal the plexiglass and a thick grease to seal the crivece between piston and cylinder wall. Don't expect everything to seal w/o bubbles the first try. Keep working with it until you get it where you can repeat it accurately. Clean parts should be easier to work with than used parts. Here's a link to my camaro's LT1 liquid measurements with pix: https://camaroforums.com/forum/lt1-l...mes-ccd-81437/

That HSR looks pretty bad azz and your motor is looking great to. Almost to good looking to install and run . I would hate to get that one dirty.

I think you will have alot of self satisfaction once you get it done.

cardo0

BTW I need to ask what are the holes on the back of the HSR plenum for? As far as I know the HSR doesn't have EGR provision. But what else can bolt on there??

GREGGPENN