[logan1]

Originally Posted by ap72

They are pretty close with only a few subtle differences-
a hair less duration (better for lower RPM power)
a hair wider LSA (better for your heads and application)
a hair tighter lash (quieter and usually more durable)

Overall there's probably not even a 15hp difference between the two.


EFI is also something to consider, it really makes a hell of a difference on power, economy, and durability. You can cobble together a system with a bunch of used parts for a few hundred bucks, even a basic TBI system would be a good starting point.

Ive been toying with the idea of EFI but from what i can tell its pretty damn expensive to do. I see the systems selling for $1200 on craigslist all the the time.

Originally Posted by vinniekq2

You dont have to pick that exact cam,its just a guideline,what I would use.The dual plane will eventually come off and you will remember this thread.Your car is so light that the low end boost is really wasted on your car.Good luck with the car,hope to see a video of it soon.
There is a 240 in my area with a Toyota 6,probably makes 500 hp and sounds great.

Ya a lotta guys run the 2jzgte or the RB26dett straight motors and make a lot of power but since im on a rather tight budget but want a fast car. The SBC is were i find myself.

[vinniekq2]

2jz is a great engine,but a small block V-8 is no slouch and if its turbo ed then 800 HP is standard
I will some day convert to F.I. also. But it cost me $600.ºº for a custom built 950 so I will suffer with that for now

[ap72]

If you can soulder, Megasquirt PCB3 ECU Fuel Injection Injector EFI Kits | eBay

Get a harness to go with it, a junkyard throttle body, temp sensor, air temp tensor, and o2 sensor plug (new o2 sensor) and you have a very good EFI system that is quite capable- down the road upgrade your intake to a multiport EFI system for even better results.

BTW these can also easily control spark timing with a stock chevy distributor from a TBI or newer vehicle.

Your total will be around $400 if you don't mind going to a junk yard.

Here's a preassembled unit, though its not as nice, its a MS1 v2.2, still more than adequate but not as many bells and whistles as the PCB 3.0, megasquirt v2.2 I'd offer him $150 shipped.

Here's a preassembled MS2 unit, which is also a little better than both of th eprevious but a little more costly- Megasquirt II 2 PCB3 Standalone Engine Management ECU | eBay

BTW, these units are both upgradable to control COP ignition and sequential EFI if you really feel you need every last bell and whistle. All of them do nitrous control, dual fuel tables, boost control, fan control, etc in even their most basic form.

In the end it really makes you question buying a $650 carb...

[logan1]

In the future I will probably go to EFI but for now holley is my girl.

[logan1]

Originally Posted by vinniekq2

You dont have to pick that exact cam,its just a guideline,what I would use.The dual plane will eventually come off and you will remember this thread.Your car is so light that the low end boost is really wasted on your car.Good luck with the car,hope to see a video of it soon.

Vinnie I was researching your comment about the single plain intake and how it would be better for my application and i cam across this video that pretty much proves that the air gap is the one to go with. Thought you might be interested in seeing it aswell.

Edelbrock Intake Manifold Dyno Test :: Single Vs Dual + Air-Gap Vs Regular - YouTube

Edelbrock Intake Manifold Dyno Test :: Single Vs Dual + Air-Gap Vs Regular - YouTube

[vinniekq2]

Originally Posted by logan1

Vinnie I was researching your comment about the single plain intake and how it would be better for my application and i cam across this video that pretty much proves that the air gap is the one to go with. Thought you might be interested in seeing it aswell.

Edelbrock Intake Manifold Dyno Test :: Single Vs Dual + Air-Gap Vs Regular - YouTube

do the math or comparison on higher revving engines. Ive given away performers.
My Z-28 Camaro picked up 4/10s from just changing the performer to a victor Jr
Its true the performer responds at lower RPMs
With a mild engine,hydraulic flat tappet cam, Vacuum secondary middle of the road carb,heavy car,mismatched over size heads,and various other common mistakes,the performer will bridge the gap better.
when you step up,you will see
use the dual plane,some people are very very happy with that type of power delivery and I recommend the dual plane most of the time
I saw an opportunity in your car to show an example of what power is to be had,yours would be worth the improvement.

If you ever come to BC,call me,I will show you what a sports car can do

[logan1]

What are you thoughts on a Demon 750 carb compared to the holley 750 DP.

[vinniekq2]

Originally Posted by logan1

What are you thoughts on a Demon 750 carb compared to the holley 750 DP.

I dont like the small A N fittings on the Demon and the 830 demon I had on my small block didnt have as good as response as the 950 HP I have now. Demon is a good carb with good factory support(not sure about now)
You can buy a custom H P holley for a very reasonable price

[F-BIRD'88]

Keep the RPM air gap. Upgrade the 700carb with a holley/proform 750HP carb body kit.
Get rear jet extensions and holley float bowl whistle baffles for road racing.
Get a Crane F278-2 cam with 1.6 rockers
or a Crane F280-2 cam with 1.5's or 1.6 rockers.
Both either are fine with power brakes. Nice powerfull street strip/road racer mechanical flat tappet cams.
But tame enough for street driving.
Crane Cams | Automotive Home Page

[1Gary]

Logan,
Are you in Ohio??. There is a user name of Logan on one of the Astro forums. He owns Mr Bee appliance service.
Too bad you couldn't swing a full solid roller and kit from Howards.I've bought a number of cams from them and they certainly build nice stuff.Never had a problem with them.
I can I.D. with your project.Yrs ago we built a 1952 MG TD with a SBC,IRS,rocker crusher close ratio 4 speed,it was a 327 with Man-A-Fre induction,Isky solid lifter cam,12.5 SCR,Mondello heads.A riot to drive.Would go around corners like it was on rails.Yep-your project brought back some memories,

[logan1]

Originally Posted by F-BIRD'88

Get a Crane F278-2 cam with 1.6 rockers

How much gain will i see using the 1.6 rockers?

Originally Posted by 1Gary

Logan,
Are you in Ohio??. There is a user name of Logan on one of the Astro forums. He owns Mr Bee appliance service.
Too bad you couldn't swing a full solid roller and kit from Howards.I've bought a number of cams from them and they certainly build nice stuff.Never had a problem with them.
I can I.D. with your project.Yrs ago we built a 1952 MG TD with a SBC,IRS,rocker crusher close ratio 4 speed,it was a 327 with Man-A-Fre induction,Isky solid lifter cam,12.5 SCR,Mondello heads.A riot to drive.Would go around corners like it was on rails.Yep-your project brought back some memories,

[IMG]http://i172.photobucket.com/albums/w33/garysgifts/other/1951_MG-TD269104219_std.jpg

No i am not from Ohio. At some point down the road ill probably build a roller motor for this car but right now money is tight but i really want to finish my project. Dont what it to become another unfinished project like the millions on craigslist.

I've always been a big MG fan but being that in 6'5" tall MG's are not cars i fit into. The reason i bought the datsun us because it was the only affordable 2 door sports car that i could fit into. I bet that MG was a blast to drive hopefully mine will be fun once its done.

[logan1]

Originally Posted by F-BIRD'88

Get a Crane F278-2 cam with 1.6 rockers

Originally Posted by logan1

How much gain will i see using the 1.6 rockers?

Ok from what i have read the 1.6 rockers will only give me 10hp more than the same cam with 1.5's. I also read a few posts that said that they wreak havoc on the valve train; not sure if this is substantiated info or not but at this point im not too inclined to run em.

Also i saw that thread posted by landshark and the problems he is having with 1.65.

[Hogg]

Originally Posted by vinniekq2

do the math or comparison on higher revving engines. Ive given away performers.
My Z-28 Camaro picked up 4/10s from just changing the performer to a victor Jr
Its true the performer responds at lower RPMs
With a mild engine,hydraulic flat tappet cam, Vacuum secondary middle of the road carb,heavy car,mismatched over size heads,and various other common mistakes,the performer will bridge the gap better.
when you step up,you will see
use the dual plane,some people are very very happy with that type of power delivery and I recommend the dual plane most of the time
I saw an opportunity in your car to show an example of what power is to be had,yours would be worth the improvement.

If you ever come to BC,call me,I will show you what a sports car can do

From a Performer to a Victor Jr, no wonder your car did better. Unless you are speaking of a Performer RPM to a Vic Jr. I dont think anyone should ever pick a Performer intake over a Performer RPM intake.

peace
Hog

[Hogg]

Originally Posted by logan1

How much gain will i see using the 1.6 rockers?

Guys see about a tenth in the 13-14 second car range going from conventonal baal/stud stamper rockers to full roller pivot/tip 1.6:1 rockers.

peace
Hog

[F-BIRD'88]

Originally Posted by logan1

Ok from what i have read the 1.6 rockers will only give me 10hp more than the same cam with 1.5's. I also read a few posts that said that they wreak havoc on the valve train; not sure if this is substantiated info or not but at this point im not too inclined to run em.

Also i saw that thread posted by landshark and the problems he is having with 1.65.

10 HP is 10 HP. Not a bad gain for just a rocker ratio increase.

1.60 rockers do not tear up the valve train.

Landshark is having problems for other reasons.
Like the funky pushrods he is using. Not hard to see why the guide plates are getting all carved up, by using those fubar pushrods.

People have valvetrain problems for various reasons
usually incomparable parts or lift interference or improper geometry (pushrod length)
1.6 rockers on a SBC are not a problem, when installed right.

That Crane cam has modest valve lift especially on the intake side.
1.6:1 rockers is a good way to effectively get more net valve lift.
increases the rated valve lift (w/1.5 rocker) by a factor of 1.0666.

EG: .480" x 1.0666 ='s .512" net valve lift

When ever using aftermarket heads you need to pay attention to valvetrain geometry.