I got a 74 model 400 sbc. Its out of a 2500 pickup truck. I don't know much about it. Just curious about how much torque/hp it would make stock?

Until my bud has money to rebuild it, hes just going to clean it up and stick it under the stock 86 computer controlled carb-intake to get it running. I'm thinking 200 rwhp and 300 rwtq.

How would it run against a bolt on l98
New Magnaflow cat
Catback
GUtted box w/K&N's
Slp runners
AFPR

 

400's were pretty gutless stock.

 

Probably something like 135 HP stock, at the flywheel.

 

Stock 70's cars were severely inefficient. It sucked in the car it was in, and with his crappy tune, it'll blow even more. Have fun winning.

 

yep, might as well run an L03 if you are going to leave the 400 stock. More power, possibly more torque, with less fuel consumption. Considering with the right bolt ons an L98 can run 13s, I'd say you'd be trainlengthed immediately. Not even a holeshot to claim against an L98

 

Well I found out some more about the motor. he's going to be running a rebuilt, stock type bottom end. 64cc ported heads (L98), Aluminum Dual plane and prob the stock quadrajet with different metering rods. he's running shorty heads with true dual exhaust.

I believe with the compression bump from the small cc heads, better flow from the heads, larger, free flowing exhaust, and getting more air to it, it should be quite different than stock. He's also going to be using posi 3.23 gears, much better than his stock 2.73 open diff.

 

if he's running a quadrajunk and the same old trashcan cam the stock motor came with you'll still beat him by buses. Basically what you've described to me is a shamble of an engine. He's running L98 heads, which is fine, but so are you, so he has no real advantage other than the porting. He's getting more compression but if he didn't bother to change the cam, more compression with hurt him. Compression is only good if you can feed the engine with enough fuel and air to make the power it can support, and judging by the top end I wouldn't say he's done that. Stock quadraleaks and stock 400 smog cams aren't compression friendly. You'll land on him, hard.

 

Hes running a different cam also. 228/228 somewhere in the high .49x/.51x lift, can't remeber the exact. 110lsa.

 

Turns out he orders a holley performer intake, high rise design, holley 650 DP , still not sure about the cam, but its much larger than the stock truck cam.

I though he was going to run the stock intake/carb and stuff, but i heard wrong. he's just going to put them on the motor to make sure it runs, then hell swap over the intake/carb and fine tune it

 

Gutless about sums it up.From the factory most were low performance but I have seen some 430hp and 500ftlbs with vortec heads and a xe274.They love to make torque.

 

If he's gonna run l98 heads I hope he knows about the steam holes that have to be drilled? Or he's gonna have problems Don't underestimate a 400 though if it has different heads/cam/intake. I've built a few with with stock compression and they've ran pretty good.

 

a 400 small block oughta make hellified low end torque. Even under the stock LG4 intake and carb. It would be a great launcher, but thats about it.

 

Its going to be a wierd engine

his lg4 intake and low compression will help bottom end, but the cam and decent heads will want to rev higher. His hp curve is prob going to be flat as hell and max torque will be at 2000rpm. Sounds an awful lot like tpi.

 

I though he was going with a holley intake? It'll be a decent performer, not a bigblock killer by any stretch but I'd say it'll hold it's own. Gonna be a torque monster and thay's what get's ya going

 

I would say its going to make about 400 lb ft tq at the crank and 220 crank hp.

It will be fun.

He's just using the stock intake to get teh car running then hes gonna swap the holley intake on.