[Skip Fix]

Ken looking at my IA I agree! But as slow as E heads drain some might be sitting up there too! My iron IA I drilled the "421 hole" on as well as all my street motors. That is right where my RAIV heads on a non drilled block blew a head gasket.

[slowbird]

Originally Posted by steve25

You seem to be really hung up on building a sub-performing 400 regardless of info presented to you.

Your posting in the competition section so if you want to run that cam in a 406 cid motor then get 12 to 1 into that motor, or pick a different cam.

What's wrong with his cam???

[steve25]

His cam is fine for a 400, just not with the resulting compression he will have from 72 cc aftermarket D ports.

[Stan Weiss]

Originally Posted by steve25

Stan here’s they dyno sheet from that motor that Pete sent me back then.

I will post it up in 3 photos so you can zoom in better.

In looking at the power anomalies from 5700 rpm on up I think I would really call that 400 a 467 Hp motor, what do you think ?

Steve,
Thanks. Interesting that the average for BSFC doesn't even include peak HP RPM.

Stan

[Stan Weiss]

What I see is that cam in a 406 ci engine with 315 cfm heads and 10:1 cr making around 625 peak HP at around 7500 RPM.

Stan

[PAUL K]

Originally Posted by Stan Weiss

What I see is that cam in a 406 ci engine with 315 cfm heads and 10:1 cr making around 625 peak HP at around 7500 RPM.

Stan

Sounds about right.

[performerrpm]

which cam @ 625hp? the solid roller cam? thats not horrible....dunno that the 400 block would care much for the 7500 rpms tho...wonder what the torque would be

[blueghoast]

UHM Impressive. Good luck with it.
GT

[steve25]

With a 400 that is Camed to make peak hp at 7500 it also comes down to more importantly and first where the rpm of peak torque would, then secondly how much torque is made.

[PAUL K]

Originally Posted by performerrpm

which cam @ 625hp? the solid roller cam? thats not horrible....dunno that the 400 block would care much for the 7500 rpms tho...wonder what the torque would be

The 271/279 cam you listed

[PAUL K]

Originally Posted by steve25

With a 400 that is Camed to make peak hp at 7500 it also comes down to more importantly and first where the rpm of peak torque would, then secondly how much torque is made.

The torque can be multiplied by gear ratio. The peak would be addressed with converter stall speed or clutch set up..... The deal is it usually isn't a street friendly set up.... As you know.

[Stan Weiss]

Originally Posted by PAUL K

The 271/279 cam you listed

Yes that is the cam.

Stan

[Stan Weiss]

Originally Posted by PAUL K

The torque can be multiplied by gear ratio. The peak would be addressed with converter stall speed or clutch set up..... The deal is it usually isn't a street friendly set up.... As you know.

Exactly. The people get really scared if you talk about a rear gear ratio that starts with a "5".

Stan

[Skip Fix]

FWIW the NHRA "Stocker" cam in Joihn Schloe's old RAIV FIrebird was 274/274 @ 0.050 but ran in the 10s way back when. SO not street friendly either, but he buzzed it 7000 through the traps with cast rods-before they allowed rod and block upgrades.

[Stan Weiss]

Since this is the race section, that is what I looked at putting together.

You can replace that cam with the 288 cam and the Victor with the T2, and it will produce more torque, but less HP, but both will be at a low RPM.

Stan

[Dragncar]

Just run the Victor, it will be fine. The T2 might run a little better on a 400 but no deal breaker IMO.
Like I said, my buddy ran one on a 400 with RAIV cam and home ported 62s and it surprised me. He was running 11 flats in a car just as heavy as mine and he outran me a bit. And I had a 455HO with roller cam.
T2s are known for working well on 400-428s but kinda ugly IMO.
I tried one on my 455 with 96s and the RPM and Victor ran a little better.

You can run that 4500 intake with 4150 carb with 1" home made spacer. Just get some 6" wide 1/2" thick aluminum flat bar and have them cut you 2 pieces 6" lond. Needs to be exact or a tiny bit longer as the 4500 bolt holes are close to the edge.
Take one piece and use a 4500 gasket and transfer punch the bolt holes and drill 5/16". Then you get a drill bit one size larger than a 5/16 Allen head bolt and with a drill press countersink them. Then mark a 4150 size square opening in the plate, drill a hole somewhere in it take a jigsaw and cut it out slightly undersized. Prep edges with die grinder.
Top plate. Transfer punch 4150 carb bolt locations and drill 1/4". Tap 5/16 and make sure they are straight. Then you need to drill some 3/16 holes around the edges through both plates and tap the bottom plate 1/4". Size up the holes in the top plate 1/4" and countersink them for 1/4" Allen heads.
I made one and it works great with a 4 hole Super Sucker on top of it.
You can see a couple marks on mine where it got away from me when I was using a big cutter on the corners. The bif marks do not effect performance on mine.
Had some time in this and I would have been ticked if I had to re do it.

[Steve C.]

Make sure to transition the air smoothly from the 4500 manifold opening to the 4150 carb.

Example: https://www.wilsonmanifolds.com/prod...0-mani-adapter

( Information provided in this post does not represent any endorsement of the concept and not based on personal experience and is offered for general interest only )
.

[Skip Fix]

Here is my adapter for transition but I put a Braeswell 4500 pattern base plate on his HP 1000

[Steve C.]

With the discussion of adapters, a tid bit for interest....

When I converted to fuel injection on my current 505 we used an old style 4500 Victor intake that I had on hand. It was previously runner blended and port matched to my cylinder heads.
In order to fit the 4150 style throttle body to the intake we used a Brodix HV300 4500 to 4150 carburetor adapter.
However the adapter was modified, it was cut down and blended for a smooth transition into the intake plenum/runners.


https://www.summitracing.com/parts/bro-hv300

.

[performerrpm]

i think for the 400s sake, i probably better go ahead and stick with the 288 cam. although i think my 65 backhalve car with jerico 4 speed would have sounded cool af @ 7500rpms. but i do have my original 455 with the same ross/eagle combo already machined and balanced so maybe ill hang the victor and 310 heads on that one instead with that sr cam. maybee the extra cubes might tame that power band a lil.