http://www.gofastnews.com/board/tech...t-volumes.html

 

I did not read all of it looks like they were going to run a baby 276
duration cam

Your 355 bottom line its power range is going to be dictated by the high duration 246 .O50 cam probably around 3700 rpm on up, your throwing in another high rpm piece the single plane manifold. use heads that are going to make best power 3700 rpm on up.

I've had a bunch of 355s, 3.70, 4.11 with 12.5, 11.0 compresion 244 to 250s duration cams they can run good in there power range they are total dogs at lower rpm no matter what you do with this much cam timing.

I'm not knocking what your trying to do with the 355 but to make power with the 355 you have to do what your doing bring the power range up in rpm with the duration on the cam, you may as well have runners to feed the higher rpm range. If sometime in the future you get tired of keeping the 355 buzzing the heads will still come in handy for a little lower rpm big cube small block.

 

GURU - I just by the race motor machine shop. My original 79 L-82 39700010 high nickle 4 bolt is getting a new lease on life. It's been sitting in my garage for years as a short block with smeared KB hyper pistons .030 over. They said it would clean up at .040 and sonic tested to .060 safe if I want more cubes.

I have a friend drag racing only trailored and stored 1965 Nova with a 355, big solid cam just like you guys are talking 250/260 something with 108 LSA, VJ aluminum Heads, VJ intake, and Proform 800 ish CFM carb on two inch spacer. TH400, 4500 stall, trans brake, reverse shift pattern, full caged and tubbed.

I told him from day one 355 ci is going to be boring after a year or two. I advised "SPRAY" with a 150 or 175 hp shot and he said N/A only.

Well he knows that my Vette went 11.70 with a 383

Well he is a rancher and cattle prices were good and the herd sold for good money and now he ask me about my last forged 3.875 stroker crank and block sitting in my garage and what was I doing with it.


nothing!

Well 4.040 X 3.875 = @398 CI

I've got the crank and the block. The 6 inch bushed H beam stroker rods and Wiseco forged flat top pistons kit are about $1000. Machining and balancing.............. are not finalized on the total cost.

We are taking every else off the 355. cam, heads, pan, intake, ATI damper, hooker S/C 1 3/4 headers with 14 inch collector extensions.............................. .......


This comes down to machining and parts costs which is nothing compared to the performance gains and now he will have a three year old 355 ci kind of short block sitting in a corner some where just like me.

Ready to roll with somebody that wants a sub 100 pass 1/4 mile 355 hot short block in a bag

 

I wish I needed a shortblock.

 

What any motor build comes down to the HP per $

NASCAR or even 360 Sprint car or 358 ci circle track cars have cost limits rules.

IMO - hot H-flat and H-solid cams become unstreetable before the HP potential is reached.

Then you have to step up to the plate and say roller cams. The same HP is attained with drive ability.

since I have been on the forum I have always said that big heads and small cam work

 

I wouldnt mind a roller cam. might get one in a few years.

 

What I and few others I think are trying to get across: Years ago a small block was 355ci, period. The street guys were getting 350HP out of them and the track guys were making 450 -500HP.

Two different motors completly, you couldn't drive the 500HP motor on the street, or I should say you can but it is a pain in the azz. That's all were are doing is trying to help you so you are not dissappointed with the street manners of a 500HP flat tappet cam 355ci.

If you want a 500HP small block that you can drive on the street then you have to move up to a least a 383/396ci but a 406ci would be the best. Just trying to help here, I've owned them all and know how they all behave

 

I understand your concerns.

If it doesnt make 500hp, oh well. I mainly wanted the RPMs.

 

Oh well I tried, you will have to find out yourself

 

What i'm talking about is a non street 396 small block. But what my friend is going to have is cheap motor that just drops a .500 or so second in the 1/4 with 60 or so more foot pounds across the whole rpm range

 

Those wiseco pistons are what i am using in my 355. 1.0625" compression height right?

What size rings do they take(got mine used) 1/16 1/16 3/16 right?

 

You can make the 500 hp big runner iron heads are not expensive
solid flat tappits can do 8000 rpm lol. you already have some lightweight valves. think you said you had some strong rods. you have the best oil pump money can buy.

Just get those 4.56s back behind that M21 as a minimum lol.

Hey whats the difference between starting at 3700 and 4500 its only a mere 800 rpm lol.

 

Dart iron eagle platinum's 200cc are the head for me. I have definitely bought into their development process.

 

To this day I still want to build a really high rpm small block there is just something about the quick reving high pitched scream of a small block that I love.

You keep talking about this 355 your going to push me over the edge

 

Same here, always loved em. Should have mine fired up in a month or two, 7500 rpm 358.

 

This is fun
http://airflowresearch.com/articles/article072/A-P1.htm

The AFR Website has a whole list of 500hp 355s.

 

Correctly matched components are the key. This goes for the trans and rear end as well. In these AFR articles. they are using top of the line components throughout , carefully matched. Aerodynamic counterweights, thermal coatings, AFR 210 heads, Solid roller cam. This is not a budget build and with the cam specified you would need a low gear , close ratio trans and rear capable of handling that much power. As Motorhead and Gkull said, you hit a point where streetability suffers as you try to pull too much high rpm horsepower out of an engine without a roller cam.

 

I think the only thing I would change in my drive line would be to replace my M21 with a Super T10 with the hardened gears with the 2.64 first gear. Or if I fall into some cash a richmond 5-speed with teh 3.27 first gear.

I think in all realistic thinking 534hp would be a perfect world engine dyno number and around 10% less in the land of the real world.

I honestly dont think its going to be any worse to drive than the old solid lifter small blocks of the day.

 

You what fascinates me at the moment, are the 302s

The people that drove their old camaros around with the crossram and the BIG solid lifter camshaft (257/261). That was either the coolest thing in the world or a complete bitch (could it have been both?).

 

They are both and most had a 4.11 or 4.56 gear with close ratio manual trans.