[charlie66]

I'm looking to make more hp with my engine. I'm not sure if where its at now is maxed out or not, With out porting and raising the compression . I will be willing to change the cam if it has to be... and if I did raise the compression and port what would it be worth. With my bore and stroke what is the limit on the cfms of the head that will be still usable?

461ci 4 bolt main (pro Gram) No block fill

Ross Forge flat top pistons 4.155 bore about 11:3 to 1.I still run pump gas...

Eagle H beam rod with L19 bolts

Forged crank 4.25

Edelbrock head cnc ported by Kauffman 334 cfm 75cc closed chamber.

Lifter bore brace.

Bullet roller cam 259/263 660 lift ,on a 110 .

Any help will be very much appreciated ..

[fasteddy]

In my opinion, you are pushing the pump gas envelope already. Higher compression will yield horsepower but you will need 110 race gas. Is this a race car only application/question?

[screamingchief]

There are always better cams for any given combo,but you gotta ask yourself if you are willing to potentially spend big $$$ on buying multiple cams to try on the dyno to chase after what may amount to minimal gains.

And as I understand it,the Eheads max out @ 340-350 or so CFM before going to a wide port configuration,so there may a minimal gain there too,but again one has to ask themselves if it would be worth the trouble to do such.

CR is the real challenge,agree you may be maxed out there to still run it on pump gas.

Tell us about the rest of it,intake & exhaust tracts,rocker ratios and the like.

Might be something there to be had.

Honestly,the dyno time alone to do something like this properly would be pricey.

IMO there's always something more to be found if you look hard enough,but it's a matter of ROI in terms of both time & $$$$.

FWIW

Bret P.

[demonic68]

Maybe. Time for nitrous? If that is an option

[David Holmberg]

You have enough motor to run low 10's IF the rest of your combo is right.

I'd make sure the converter, gears, exhaust, carb and suspension are dialed in first.

What intake and Carb? What header and exhaust size? Converter and gears?

[BruceWilkie]

A ported head and manifold/carb that can keep up can get you more power. However thats only if you are going to take full advantage of the increase in flow capacity. Generally that means you need to turn the rpm up. HP = (Tq x RPM) /5252 keep in mind the importance of rpm on that equation. If you make say 550 HP at 6000 thats 481.33...ft/lbs at 6000. If you increase your mass air flow and make changes that make the same 481.33... tq, but now at 7400 rpm your HP will now be 678.33... !

If you port your heads to 340 cfm and match the rest of your build to that flow capacity you are likely going to be able to make peak power at @ 7400 rpm or higher depending on actual VE. You can make more HP than that at 7400 IF you increased VE capability with header/manifold tuning/sizing, cam changes etc. that allow for it. A 340 cfm head should support at least 700 HP at pump gas compression and considerably more if its well refined.

[charlie66]

Originally Posted by fasteddy

In my opinion, you are pushing the pump gas envelope already. Higher compression will yield horsepower but you will need 110 race gas. Is this a race car only application/question?

Its a street driven car but, I want to get all I can get out of it. I would be willing to run e85.

Thanks..

[charlie66]

Originally Posted by screamingchief

There are always better cams for any given combo,but you gotta ask yourself if you are willing to potentially spend big $$$ on buying multiple cams to try on the dyno to chase after what may amount to minimal gains.

And as I understand it,the Eheads max out @ 340-350 or so CFM before going to a wide port configuration,so there may a minimal gain there too,but again one has to ask themselves if it would be worth the trouble to do such.

CR is the real challenge,agree you may be maxed out there to still run it on pump gas.

Tell us about the rest of it,intake & exhaust tracts,rocker ratios and the like.

Might be something there to be had.

Honestly,the dyno time alone to do something like this properly would be pricey.

IMO there's always something more to be found if you look hard enough,but it's a matter of ROI in terms of both time & $$$$.

FWIW

Bret P.

Ok, 4500 victor intake, mad dog 2" headers 3 1/2 collectors with Borla 3 1/2 muff turned down at axle, 1050 dom. Rockers 1:6 .

Sounds like maybe I'm real close to max power?

[charlie66]

Originally Posted by demonic68

Maybe. Time for nitrous? If that is an option

I have a plate on it. I was told that with the cam I have I shouldn't go higher then a 150 shot though. I wish I knew if that were true...

[charlie66]

Originally Posted by David Holmberg

You have enough motor to run low 10's IF the rest of your combo is right.

I'd make sure the converter, gears, exhaust, carb and suspension are dialed in first.

What intake and Carb? What header and exhaust size? Converter and gears?

I do have the comb worked out. That's why I want to step up the power.

1050 dom , victor intake, 2" headers 3 1/2 exhaust . Converter is a 10" continental 3500 stall , gears were 3:89 but changed to 4:11..

[David Holmberg]

Originally Posted by charlie66

I have a plate on it. I was told that with the cam I have I shouldn't go higher then a 150 shot though. I wish I knew if that were true...

With a stock block I'd limit it to 200 or less.

I went 9.90's with less compression, less cam, 4150 carb, less head and the wrong converter with a .73 jet @ 3700 lbs.

[David Holmberg]

Originally Posted by charlie66

I do have the comb worked out. That's why I want to step up the power.

1050 dom , victor intake, 2" headers 3 1/2 exhaust . Converter is a 10" continental 3500 stall , gears were 3:89 but changed to 4:11..

I wasn't trying to imply you had or did anything wrong.

So you're looking to run 9's in street trim? More power is subjective when you've not given a dyno number or ET.

[charlie66]

Originally Posted by BruceWilkie

A ported head and manifold/carb that can keep up can get you more power. However thats only if you are going to take full advantage of the increase in flow capacity. Generally that means you need to turn the rpm up. HP = (Tq x RPM) /5252 keep in mind the importance of rpm on that equation. If you make say 550 HP at 6000 thats 481.33...ft/lbs at 6000. If you increase your mass air flow and make changes that make the same 481.33... tq, but now at 7400 rpm your HP will now be 678.33... !

If you port your heads to 340 cfm and match the rest of your build to that flow capacity you are likely going to be able to make peak power at @ 7400 rpm or higher depending on actual VE. You can make more HP than that at 7400 IF you increased VE capability with header/manifold tuning/sizing, cam changes etc. that allow for it. A 340 cfm head should support at least 700 HP at pump gas compression and considerably more if its well refined.

I was wondering if I changed the cam to a larger one and left the heads and compression the same and raised the rpm up ,is there enough power there to gain to make it worth doing all of this? I know it peaked hp @ 6600. I had the car on a chassis dyno..

[charlie66]

Originally Posted by David Holmberg

I wasn't trying to imply you had or did anything wrong.

So you're looking to run 9's in street trim? More power is subjective when you've not given a dyno number or ET.

I didn't think you were. I just wanted to let you know I had it for what I think pretty close.

I have been to the track with a different cam in it then there is in it now. The old cam was a hydraulic 248/253 @ 0.050 lift was 585 on a 108. I made 507hp to the tire on a dynojet chassis dyno an car weighs with me in it 3380 car has been 10.23 @ 129.6 when it was hurt. 60' was 1.43. I think it went 6.50 in 1/8 but not sure anymore . it was in 2010.
Now with the new solid cam it made 540 to the tire but I never have been back to the track to see what it will do. I was hoping for some 10.00's or maybe even a 9.99 lol.. All I know is now with the new cam it wants to keep revving higher and higher...

[charlie66]

Originally Posted by David Holmberg

With a stock block I'd limit it to 200 or less.

I went 9.90's with less compression, less cam, 4150 carb, less head and the wrong converter with a .73 jet @ 3700 lbs.

That's good to know. I'm always worried about the block.. Thank you.

Is a 73 jet a 180 shot?

I put a 63 in it and the car fly's.. I just have to get it to the track and see ...

[blueghoast]

I Believe more cam will get you there.
I got my camshaft from Scott Brown and that makes all the difference
In my application, My heads flow less then yours do and I think with
A cam like mine you would make a lot more power. As for as the n20
Try more you won't know intill you do, It's not like it won't make more
It's how much more (will) it make with more. The only thing about
running more camshaft is you'll need springs to handle the cam also.
I do believe with a better camshaft you will make quite a bit more power.
I am at more compression 12:1 and still pump gas. Hope this helps.
My LSA is at 113.

GT.

[grandville455]

Originally Posted by blueghoast

I Believe more cam will get you there.
I got my camshaft from Scott Brown and that makes all the difference
In my application, My heads flow less then yours do and I think with
A cam like mine you would make a lot more power. As for as the n20
Try more you won't know intill you do, It's not like it won't make more
It's how much more (will) it make with more. The only thing about
running more camshaft is you'll need springs to handle the cam also.
I do believe with a better camshaft you will make quite a bit more power.
I am at more compression 12:1 and still pump gas. Hope this helps.
My LSA is at 113.

GT.

seriously 12.1? and pump fuel wow! You running the eldys too?

[charlie66]

Originally Posted by blueghoast

I Believe more cam will get you there.
I got my camshaft from Scott Brown and that makes all the difference
In my application, My heads flow less then yours do and I think with
A cam like mine you would make a lot more power. As for as the n20
Try more you won't know intill you do, It's not like it won't make more
It's how much more (will) it make with more. The only thing about
running more camshaft is you'll need springs to handle the cam also.
I do believe with a better camshaft you will make quite a bit more power.
I am at more compression 12:1 and still pump gas. Hope this helps.
My LSA is at 113.

GT.

Yes , all guys are helping a great deal and I want to thank everyone for there input so far..

Do you have any time slips or dyno numbers?

Could you share your cam spec's? If not I understand..

[David Holmberg]

You're at the same stage I was at, any more and the streetability would suffer.

In order to make more power and keep it pump gas and lower RPM's you need more cubic inches.

To keep it simple I'd send the heads to a quality porter for work then let them pick the cam. There are some good choices up in your area.

[66bonne]

What torque convertor and stall ? I may have missed it but what is the rear gear ratio ?
What tires do you plan on running ?
Sounds like you got a good thing going.

Jim