This is going on my 86 Camaro. Compression will be at 11 to 1 ,solid roller, scat 4.25 carnk, 6.385 H beam rods, cam specs269/278 at 050 698.700 107c , heads will be worked over 781s with 2.19/1.88 valves. I've got a 700r4 tranny warrantied up to 550 hp to the wheels with a 3500 stall that flash stalled to 4k with a 383 and 4.10 gears. Please offer pro's and cons. My main goal is going fast at the track but I want to drive my car there. It will see a weekend of usage once in a while.

Compression a tad high unless you plan on race gas all the time. Cam is a tad on the big side IMHO also. Converter will probably be a little loose with the major torque gain. Your tranny warranty will be over when you crank the new engine. :D Headers will be no fun to install and install if that is a factory chassis. It should run quite strong.

Steve

Since you are replacing the 2.06 intakes with larger valves, I would go.. all… the…. way (sorry had an NFL moment) with 2.30" valves.

The trany won't survive but a few passes so get your photo ops early, while you can.

You say 11.0:1 compression with what I am assuming are flat tops. Since this car isn't running supper stock with a 496cid, and you are already into racing fuel, I would bump the compression up to 13.0:1 with a J&E 118521 slug.

Don't forget while you are working over those heads to save time polishing, and spend more time pocket porting and opening up the exhaust roofs. I have also had success with epoxy wedges on the floor of the exhaust ports with those heads.


Larger Dave

I think you should nock the comp down to 10:1. Go 2.25 int. valves and
unshroud the chambers. Throw that trans in the trash can, or find someone
who can build you a 200-4r.
Stall is a bit loose, 4.10s will work with a tall tire.
What carb, intake? What exhaust and fuel system? Whats the wt. of the car?
How fast you wanna go?

Compression a tad high unless you plan on race gas all the time. Cam is a tad on the big side IMHO also. Converter will probably be a little loose with the major torque gain. Your tranny warranty will be over when you crank the new engine. :D Headers will be no fun to install and install if that is a factory chassis. It should run quite strong.

Steve
Yeah , the race gas thing is a given. I entered the cam specs on dd2k and this is what it gave me, 638 hp at 6500rpms and 595 peak tq at 5000rpms. Now grumyvette suggested this cam 269/275 at 050 714/714 and it gave 652 at 6k rpms and 632 at 4500rpms. I will look into getting a grind like grumpyvettes suggestion.

Since you are replacing the 2.06 intakes with larger valves, I would go.. all… the…. way (sorry had an NFL moment) with 2.30" valves.

The trany won't survive but a few passes so get your photo ops early, while you can.

You say 11.0:1 compression with what I am assuming are flat tops. Since this car isn't running supper stock with a 496cid, and you are already into racing fuel, I would bump the compression up to 13.0:1 with a J&E 118521 slug.

Don't forget while you are working over those heads to save time polishing, and spend more time pocket porting and opening up the exhaust roofs. I have also had success with epoxy wedges on the floor of the exhaust ports with those heads.


Larger Dave
I just bought my 700r4 from mad dog lou . Do you think this combo will give more than 550hp to the ground? If it does brake my tranny I think it will be problem I would love to have. Probably won't be saying that when it actually happens :D.

I think you should nock the comp down to 10:1. Go 2.25 int. valves and
unshroud the chambers. Throw that trans in the trash can, or find someone
who can build you a 200-4r.
Stall is a bit loose, 4.10s will work with a tall tire.
What carb, intake? What exhaust and fuel system? Whats the wt. of the car?
How fast you wanna go?
I have heard 200r4 handle more power than a 700r4 when built , but a 700r4 can be made to handle 550 rwhp. My tranny builder believes so, he warranted the tranny, or so I am hoping since I paid a good penny for it. Maybe I can sell it and get me a th400. Sorry for posting a new reply for it's quote ! should of done it in one reply.

If Race gas is what you plan to run all the time you definitely need to go ahead and bump the compression up to at least 12.5 to 1 or so. You are giving away a noticeable amount of power only running 11.0:1, and since you are already paying for the race gas its free power your losing staying that low. I would say a TH400 built would be a much better choice for racing.

Id be tempted to put better heads on the thing.
True, ported 781's can be made to work well. But it depends on how good the porter/machinest is.
RaceRites or AFR 305CNCs are basically goof proof.
With the rest of your parts you could be looking at 700hp plus with better heads.
Ron

Id be tempted to put better heads on the thing.
True, ported 781's can be made to work well. But it depends on how good the porter/machinest is.
RaceRites or AFR 305CNCs are basically goof proof.
With the rest of your parts you could be looking at 700hp plus with better heads.
Ron
I really should go with better heads but the budget at this point don't allow it:(. I would like to go with aluminum heads in the future . I just don't want this combo to be totally mismatched. I will definetaly upgrade later on .

I'll echo what some others have said...Ain't no way that 700 or even a 200 is going to hold up behind the torque of that engine. I'd only trust a built Turbo 400 with a Gearvendors unit, or the massive 4L80 behind that mill if you do not want constant drivetrain breakage. Remember, both the 700 and 200 were originally designed to survive behind 150 hp S10 V6 pickups, not what is probably a 700 plus HP Big Block with torque to match. If your tranny source is saying it'll hold up, some whoppers are flyin' and not the Burger King variety! Other than that, compression is about a point high for real street use, but should be one stump pulling engine without a doubt....:):)

I'll echo what some others have said...Ain't no way that 700 or even a 200 is going to hold up behind the torque of that engine. I'd only trust a built Turbo 400 with a Gearvendors unit, or the massive 4L80 behind that mill if you do not want constant drivetrain breakage. Remember, both the 700 and 200 were originally designed to survive behind 150 hp S10 V6 pickups, not what is probably a 700 plus HP Big Block with torque to match. If your tranny source is saying it'll hold up, some whoppers are flyin' and not the Burger King variety! Other than that, compression is about a point high for real street use, but should be one stump pulling engine without a doubt....:):)
LOL , yeah I get it , the 700r4 has to go. I have posted the trans here locally , see if someone buys it . If not I will figure out a way to get me a th400 . Or how about a th350??

Stick with the TH400, a TH350 can be tougher than the 700 but a built TH400 is your best durability bet provided it is built properly.

There are GNs runnin mid to low 9s with the 200-4rs so they can handle that kinda power, but it will cost a few dollars.