michael hilsabeck

Can you tell me how much hp this motor will have? Flat tops pistons bore 30 over. Edelbrock performer rpm intake manifold#7111 Edelbrock performer 750 carburetor. Edelbrock valve springs #5712. Edelbrock retainers #9736 . Edelbrock valve locks#9611. Stock #6 heads just had them redone. New timing chain and steel gear set#7813. Camshaft performer rpm hydraulic rpm range 1500-6500 duration at .006 lift intake290 exhaust 300 durationat .050 lift intake 224 exhaust 234 lift at cam intake.310 exhaust .325 lift at valve intake .496 exhaust .520 stall torque converter 2000 . Hedman exhaust headers 1.75 collector size3 in High volume pump new rocker arms and pushrods 10/10 onthe rod and main bearings clearance Distributor i no longer have points I am just starting to put it all togetter my 1st oldsmoble motor . Thank you for your help . I need all i can get!

Rickman48

In my estimation, I'd guess around 300-310, maybe more, at the crank.
I figure $10 per HP is money well spent and would've had the heads match ported to the manifold and 'pocket ported' as that's worth about 30 HP.
A friendly shop should only charge about $200.

f-85

I dont know, i would think that it woud make more HP then stock. Cam, intake, headers. I would think you should be getting 350 at least to the crank. Im sure someone else has a build like yours that they dynoed. Or Get that car to the track and get some numbers.


And like rickman said alittle porting would go a long way. More flo more go.

michael hilsabeck

i know port and polishing will get me more horse power on my heads and intake but i dont know my compreshen and i don't know how to figure it out. I don't wont to run high octain cuz it cost to much so doe's any one know the compreshen and how for can go thank you.

tonycpe

http://www.csgnetwork.com/compcalc.html

this will work

i had that cam with similar parts.it should run good.

guess is 345 hp at the crank

Aceshigh

750cfm Edelbrock is too much carb for that engine.

I just did a dyno on my '70 350 with around 300hp and trust me, it's too much.
I'd suggest a 600 - 650cfm Edelbrock.

z11375ss

I have a 750 dp Holley on mine and it's fine. It's a 4 speed though. I want gas NOW!. Could be smaller though. My advice? Build a 455, you'll be happier. I wish I had. My small block is built pretty stout and it has 347hp @ 5100 rpm. 388 torque at its peak. Watch the video in my link, it's pretty funny.

michael hilsabeck

Sorry I tried 650 holley before I started rebuilding my motor it was not what I wanted the 750 edelbrock and its works alot better. the holly you have have to know how to ajust it just right and I could never get it just right.the edelbrock performer intake manifold called for a edelbrock performer series carburetor 750 cfm #1407 because of my cam . I was trying to use the edelbrock performer rpm power package components for 350 c.i.d .they way the build sheet reads I could get 397hp in a 350 olds. i know my heads needs 2in valves and they need port and polished . but i can always do it later . I dont know if I can get 375hp? but I am on unemployment right now so the money is not there .

michael hilsabeck

added attachment for build sheet

J-(Chicago)

It's going to depend on your heads, valve job and compression ratio.

Rickman48

Carefull - match porting and pocket porting are a whole different thing than 'porting and polishing'!
Cost is about 25% less for the MP+PP and streetable, as you need the 'as cast' ports to keep fuel atomized at lower RPM on the intake side!
Porting and polishing refers to polishing the ports completely, only beneficial at WOT at the racetrack, and 4X the cost of above! NFG on the street!!!!

michael hilsabeck

I am going to get the gaskets porting intake and exhaust. had to get new retainers. the guy that is doing the heads cant put 2in valve in becouse i would have to put adj rockers in so i stayed with stock #6 valves . i hope this still give me good hp?

Aceshigh

I think you'll probably be close to your goal, and happy with that combo
Compression will play a decent factor according to desktop dyno. ~30hp
between 9 to 1 and 11 to 1

michael hilsabeck

So would i be close to my build sheet 397hp? compression ratio 9.7:1 this is what the build sheet says

Aceshigh

Depends on what work is done to the heads.

If you match the intake / exhaust of #5 heads info in that sheet, it says you'll make it. If you don't, you won't. I think 11 to 1 compression is what I got close with. Without I think it's closer to 350 on Desktop Dyno. I can post up a screen shot for you.

michael hilsabeck

The only thing is that i got #6 heads with stock valves the block was surfaced and the heads were ground. I dont know if it will make anymore compression i was toled of i put two inch valves that i would have to go with the ajustable rocker arms.

Aceshigh

Mind you , I'm NOT the voice of an expert on this one.
There are guys 10x more knowledgeable on head characteristics then I am.
From what I've read and learned tho....
Stock #6 heads flow like crap from everything I've read.

#6 stock heads VS #6 W-31 setups. etc.Both are 64cc
Small Block Olds 350 bored 30 over, 9.5:1 CR, 750cfm carb, RPM intake, headers.
Only difference will be the head flow #'s and valves.
Mind you if you bump up compression to ~11 to 1 it goes up ~20-25hp , and same for torque

Stock #6 heads = ~345hp / 380ft lbs
Intake 1.880 / Exhaust 1.567, Hi Perf Hydraulic cam


Uploaded with ImageShack.us

W-31 #6 heads -= ~380hp / 402ft lbs
Similar to what it looks like Edelbrock used with #5 heads & same valves.
Intake 1.995 / Exhaust 1.624 - Same everything else as above.


If someone see's an error, please advise and I'll correct the information.

michael hilsabeck

thank you for that that tell me alot

Aceshigh

I should have put large tube headers, but the increase is very small.

michael hilsabeck

i put headman headers 1.75 3in collectors 30in long

michael hilsabeck

Can i put 1.995 intate valves exhaust 1.624 in #6 heads without changing the rocker arms

michael hilsabeck

I am going to have to stay with stock #6 heads small valves. becouse he is just about done so i cant change the valves to 1.995 /1.624 i am going to find a set of #5 heads and have them done . but for now i will have to see how this runs. and do the body work need 1/4

Aceshigh

Your torque curve will be barely different with either head.
HP is where it will be noticeable more.

But technically torque moves your car off the line.
So mashing the pedal at a dead stop you won't know the difference.

These engines are great for beefy torque but they run out of wind quick.

michael hilsabeck

sounds like edelbrock 397 hp is a scam to bye there parts ? so how much hp do i have?