[CarNDrvr]

It seems like all the fast guys on here all have 455+ inch engines. All I have to work with is a 400, so I an going build it similar to a built 455 and see what I can get out of it. Here is my build up...anyone care to guess what it will do in a full weight '75 T/A with the A/C removed (3800-3900lb. raceweight):


* Stock 400 shortblock with stock pistons
* Fully ported #48 heads with 2.11/1.77 valves (255cfm @ .500" lift with excellent low and mid lift numbers)...should be about 10:1 compression
* Summit 2802 cam...224/234, .465/.488, 114lsa
* Holley Street Dominator intake
* 800cfm Q-Jet
* Hughes 4000 Stall
* 3.42 gears
* Hooker 1 5/8" headers
* 3" exhaust with X-pipe

[CarNDrvr]

It seems like all the fast guys on here all have 455+ inch engines. All I have to work with is a 400, so I an going build it similar to a built 455 and see what I can get out of it. Here is my build up...anyone care to guess what it will do in a full weight '75 T/A with the A/C removed (3800-3900lb. raceweight):


* Stock 400 shortblock with stock pistons
* Fully ported #48 heads with 2.11/1.77 valves (255cfm @ .500" lift with excellent low and mid lift numbers)...should be about 10:1 compression
* Summit 2802 cam...224/234, .465/.488, 114lsa
* Holley Street Dominator intake
* 800cfm Q-Jet
* Hughes 4000 Stall
* 3.42 gears
* Hooker 1 5/8" headers
* 3" exhaust with X-pipe

[Z Code 400]

There are a number of quick 400's on here!!!

[78T/A462]

Well, im stuck with my 400 but I think for what it has it runs pretty good. The 400 is in my 81T/A that weighs 3650 with me in it.
400, stock crank and stock lightened rods
trw pistons in backwards
16 small valve heads with ram air IV valves 2.11- 1.77 valves, heat risers filled with aluminum, ported but I don't have flow #'s
Edelbrock Rpm intake
Hydraulic comp cheater cam 256-264@ .050 .516lft
holley 750 vac. sec.
hedman 1 3/4 headers with 2.25 flowmaster exh.
stock turbo 350 trans with a 10inch transking 3800 flash converter
3:42 gears(so I can still cruise on the highway)
28x12.5 et streets in the rear
I drive my car on pump gas and Ive only had it at the track once. No adjustments were made or tuning and it ran consistent 12.30's @ 110mph with 1.85 60ft's. A friend and I just installed a set of slide a links to try and better my 60ft's. Shaker455 just built me a 840cfm mechanical secondary Holley(great guy!)to try out. Personally I would go with a bigger cam and 1 3/4 headers. I would imagine your car would pull et's more or less near mine. Would you consider trying out a performer rpm intake?

[form406]

low compression...8.2-1
holley 750 vacuum secondary
edelbrock performer rpm
400 cu." .30 over 1970 block
new rod and crank bearings
RA IV cam .470/.470
96cc 4X heads w stainless 2.11/1.77 valves
comp cam springs
summit double roller timing chain
152 magnum roller tip rockers
summit lifters and push rods
balanced assembly stock rods/trw forged pistons moly rings
Summit (melling?)high volume oil pump
MSD HEI/ running without vacuum advance
cheap hooker headers into 3" pipes into 2 chamber flowmasters into 3" pipes ending at axle
torque-converter stalls around 2000rpm
t-400 trans w/ trans go shift kit
stock 342 gear posi rearend w/50 series tires
74 formula 400 with black deluxe interior
not exactly the right cam for me but not a slow car either...and very lopey and bassy...

[sixt8bird]

I think you would be better off with the super comp 1 3/4" since you have a 4000 stall and fully ported #48 heads. The other thing is that the 3:42 gears seem like a missmatch. I would go 3:73s. That cam is not a real high RPM cam so the 4,000 stall I believe you will loose alot of power under the 4,000 rpm curve. You are basically setting up your car like mine. I have the same cam with 3,000 stall and 3:73s, street dominator and holley 800 dp, 1.65 roller lifter . I dont have ported heads though and I am doing 12.60seconds on a high temp track. air around 90 with track temps way higher. These opinions are just mine and you need to find out how your car goes once built. when I first built it and was doing 13.7s. Changed to an auto and gained .5 secs so 13.2 . I had a small bog with my car so I changed to a 3,000 stall from a 2200-2400 and then went with 1.65 roller rockers and an 800 DP from a 750 and went down to a 12.92. My last changes were Aluminum rims, and drive shaft and now I do 12.60.

[CarNDrvr]

I thought about 3.73's, but I am only running a 26" tire, so I thought the 3.42's were a better match for that. I would run a performer RPM intake, but they don't fit under the stock shaker hood. I heard the strip dominator is next in line for performance if its ported to the heads, and it fits under the shaker.

[78T/A462]

Larry Navarro sells some kind of kit that allows you to run a edelbrock rpm intake and still run a shaker. I run my shaker with a small air filter. Would you consider a bigger cam? How fast do you want to run?

[CarNDrvr]

I would like to run 12.30's or faster and I would really like to get as close to rollbar territory (11.99 or quicker) as I can. I know you can run an RPM with a shaker, but it ends being bolted to the hood, and I hate that. I want to keep the stock appearance. I already have the cam, and I am on a TIGHT budget, so I am stuck with this one. Given past build ups, I think it will work well. Keep in mind that this car will look stock and be able to drive anywhere...including the track.

[78T/A462]

Well, what do you run for rockers? I would try 1.65 roller rockers, 1 3/4 headers and maybe see if you can possible advance the cam a couple of degrees. Who built the q-jet? Isn't the new rule for a roll bar 11.49 and quicker?

[form406]

larry navarro on the forum makes a beautiful drop base aircleaner for the shaker that will work with an rpm...

[CarNDrvr]

I live in TX and run at Ennis. 11.99 or quicker requires a roll bar here. The 1 5/8 headers were free and all I have to run. The Q-Jet is being built by a friend of mine who is a local Pontiac guru and really knows what he's doing there.

[CarNDrvr]

Also, it sure seems like I have seen a lot of people stating that the RPM needs milled to fit. Is this always the case?

[b-man]

I know you can run an RPM with a shaker, but it ends being bolted to the hood

Not true anymore.

Special aircleaner assembly available here.



To run in the low 12s you're going to need more cam and a lower gear, at least a 3.73 cog to move your heavy T/A.

If the car were a few hundred pounds lighter you might get there with the 3.42s, but at best I see 12.50s. Running your current combo of parts I see no better than 12.80s.

Lighter car, more gear and more cam will get you to the 12.30s or below.

[Dragncar]

With #48s it is going to ping on 91 unleaded.NHRA has had a rule change.Now 11.49 is rollbar territory.You can thank all of the new Vipers and Cobras.

[CarNDrvr]

Luckily, we have 93 octane here.

[Rugratman]

12.5 here. KRE Heads. 3 inch exhaust.

[slowbird]

We just ran a 7.32 at 94.5 (1/8 mile) in bad air and skating all over the track with our street 400. It was dynoed at 502hp at 6500rpm and 473ftlbs at 4400rpm.

[sixt8bird]

My tires are 25.6" Drag radials 275 50 15s