[JLBIII]

461 engine in 68 Firebird. 2004R trans and 3.36 gears. Engine currently has stock '68 #16 heads, factory manifold and 800cfm carb. Cam is 230/236, .572/.578 lift, 112 LSA. Makes peak hp @ 5340 rpm and peak torque @ 4450rpm on a chassis dyno. Car ran a best of 12.68 @ 107.8. It currently weighs in at 3690lbs with driver. Recently picked up a set of KRE heads. I'd like to put on an aluminum manifold along with the heads. Currently looking at either RPM or possibly Torker II with spacer. Car will still be used on the street and at the track. Thanks

[steve25]

With your rear gears the TII should not even be considered.

[Dragncar]

Of the two, T2 all the way.
BTW, I just do not like duel plane intakes on a car that is used at the track. No cylinders go lean with a single plane like they can with a duel plane..
Also, a Tomahawk will run better than both of those to. And they are cheap.
Stick a single plane and a 850-950 HP on her.

[Steve C.]

D-port KRE heads ? Any port work done to them ?

A tid bit... IF a Tomahawk intake is used. Note, as cast for marketing reasons they not have large port exit openings in order to be used on 'factory' cylinder heads. Depending on the size of the cylinder head intake ports a Tomahawk intake might need port work and runner blending for a proper gasket match and use.

[JLBIII]

Originally Posted by Steve C.

D-port KRE heads ? Any port work done to them ?

D-port heads as cast. No port work, yet.

[Half-Inch Stud]

Stick with the factory iron, port-matched to the KRE. And run it awhile for 60foots and MPH. Then try a bigger carb.

[ta man]

Originally Posted by steve25

With your rear gears the TII should not even be considered.

I've had decent results with a Torker 2 and 308's...For the OP..maybe just run what you have now...and swap later

[steve25]

Good results and the best results are two very different things!

[PunchT37]

I`m going T2 with open spacer. I have never used the RPM, so can`t speak on that one.


BUT, I have only run 2 different cams with the T2 and they were/are in the mid 240`s on intake duration.


So, I`m not worried about the gears so much as the small`ish cam. I still say, go for it.

[slowbird]

Originally Posted by steve25

Good results and the best results are two very different things!

TA MAN ran 10.7-10.8s with 3.08 gears and T2, I'm guessing that's best results

[OCMDGTO]

I've run the T2 on the street for the last 15yrs on 2 different engines with 3.23s and 3.50s. First was a 400/16heads with a 236/242 hr cam and the one in my sig. I also know guys with similar combos using the RPM and they are happy, too.

[64speed]

I ran both of them on the street. I saw no difference between the two on a 468. Low speed driving around town was not a problem.

[PAUL K]

Depends on the converter. At the OP's weight the RPM will be the winner if the converter locks up below 3500.

[PAUL K]

Originally Posted by slowbird

TA MAN ran 10.7-10.8s with 3.08 gears and T2, I'm guessing that's best results

I wouldn't argue but Kinsler went 10.4 with an RPM and iron heads like twenty years ago using 3:55 gears.

[JLBIII]

Originally Posted by PAUL K

Depends on the converter. At the OP's weight the RPM will be the winner if the converter locks up below 3500.

Here's the info on the 9.5" Ultimate converter:
"UCC. 95 D SS086. That is a "D" (aggressive) pump with a 086 stator. A tight unit, we have more room to go tighter if need be. I didn't want to get too excited and bind it down too much. We should be in the lower 3k area, looking upper 2-3k so it's tight, but not locked up tight."

[slowbird]

Originally Posted by PAUL K

I wouldn't argue but Kinsler went 10.4 with an RPM and iron heads like twenty years ago using 3:55 gears.

Wasn't pump gas or a smallish cam.

[ta man]

Originally Posted by PAUL K

I wouldn't argue but Kinsler went 10.4 with an RPM and iron heads like twenty years ago using 3:55 gears.

But did he get almost 20 mpg on pump gas..

[PAUL K]

Originally Posted by ta man

But did he get almost 20 mpg on pump gas..

Maybe unless he recalibrated his speedometer.

[PAUL K]

Originally Posted by slowbird

Wasn't pump gas or a smallish cam.

Not sure what fuel was used or how that affects manifold choice.

Define smallish? I put a pump gas 455 together and ran 10.71 on the third hit off the trailer using 3:42 gears and weighing around 3900 lbs. Went back a couple weeks later and ran 10.60 @ 127 then sold that engine. Put together a similar 455 with a bigger cam and ran 10.8 @ 125.... Bigger doesn't always mean faster.

[geeteeohguy]

Originally Posted by Half-Inch Stud

Stick with the factory iron, port-matched to the KRE. And run it awhile for 60foots and MPH. Then try a bigger carb.

I agree. The factory intake is superior to the aftermarket offerings for most purposes.