[adantessr]

Hi guys. I just built a 454 for my buddy's dually for pulling his car hauling trailer. He wants to know the horsepower and torque for the engine. Here is all the build information.

454 performance passenger block bored .030 oversize
H518CP pistons (should be 7.4 to 1 comp.)
stock 14092360 peanut port heads
Weiand 8122 intake
Edelbrock 1406 carb
flowtech headers
Comp cam .505 lift intake & exhaust
intake open 21 BTDC close 55 ABDC
exhaust open 66 BBDC close 15 ATDC
duration @.050: intake 210 exhaust 218
lobe lift .297 intake & exhaust
lobe seperation: 111
65K HEI distributor
Will appreciate any help . He asks me everytime I talk to him.

[454C10]

I'll make a guess.

360 hp at 4500 rpms
480 ftlbs at 3000 rpms

make sure to run an oil additive if that is a flat tappet cam. www.zddplus.com.

BBC's tend to eat cams and that cam has lots of lift for the amount of duration so an oil additive is a good idea on flat tappet cams.

I would get a better carb. a 3310 holley 750cfm should get the job done.

also consider getting a set of 820 heads. early 70's 402 heads. They have 110 to 112cc chambers and would add a little more compression (8:1 cr) and more flow over the peanuts (maybe 20hp more).

[adantessr]

Originally Posted by 454C10

I'll make a guess.

360 hp at 4500 rpms
480 ftlbs at 3000 rpms

make sure to run an oil additive if that is a flat tappet cam. www.zddplus.com.

BBC's tend to eat cams and that cam has lots of lift for the amount of duration so an oil additive is a good idea on flat tappet cams.

I would get a better carb. a 3310 holley 750cfm should get the job done.

also consider getting a set of 820 heads. early 70's 402 heads. They have 110 to 112cc chambers and would add a little more compression (8:1 cr) and more flow over the peanuts (maybe 20hp more).

From what I've studied before actually building the engine the peanut heads are supposed to have increased flow velocity because of the small runners and give the most torque and HP at low rpm (peak hp and torque at 4000 rpm) and according to Summits cfm calculator on the page with the intake, I only need 558.3 cfm @ 5000 rpm. If he ever decides to put this engine in a performance car we would definitely change the heads and intake and go to the 750 cfm carb. We had the rods sized and ARP bolts installed so we are ready for just about anything as far as the bottom end goes.. Thanks for the response .

[454C10]

here are a couple of 454 builds with peanut heads.


http://www.carcraft.com/techarticles...ild/index.html

http://www.superchevy.com/technical/...ing/index.html

[starnest]

I concur with 454C10, the guess on HP/tourque is about right (maybe a little generous).

Also, the 820 heads are a good choice, I'm building mine using the 820 heads. However, few things are different, first I have 25cc dome pistons so my static CR is just a tic below 10.5:1. My heads were bought after the pistons, (I could have used a little more volume than the 113cc) and they were already prepped with the larger 2.19/1.88 valves and the right springs for my Comp 280 magnum cam. All said and done, I'm a bit high in compression, and the tune will be very tricky.

I'm not sure on your pistons, but if your down to 7.4:1 CR you have a lot of room to work with, look for closed chamber aluminum heads (smaller CCs = more compression). The idea is to get your compression up and if your going to spend money on heads, spend it on aluminum (unless you find 820 heads for next to nothing and you have a machinist that works cheap).

As for where you are now, the only thing that doesn't ring true is the cam selection. You have more lift than you can use with those heads, and the long duration may decrease your dynamic CR, thus decrease horsepower/torque.

[matts37chev]

this is the best app. for peanut port heads there is.
and the fact that you are using a peanutport intake manifold will only be better.

[adantessr]

Originally Posted by starnest

I concur with 454C10, the guess on HP/tourque is about right (maybe a little generous).

Also, the 820 heads are a good choice, I'm building mine using the 820 heads. However, few things are different, first I have 25cc dome pistons so my static CR is just a tic below 10.5:1. My heads were bought after the pistons, (I could have used a little more volume than the 113cc) and they were already prepped with the larger 2.19/1.88 valves and the right springs for my Comp 280 magnum cam. All said and done, I'm a bit high in compression, and the tune will be very tricky.

I'm not sure on your pistons, but if your down to 7.4:1 CR you have a lot of room to work with, look for closed chamber aluminum heads (smaller CCs = more compression). The idea is to get your compression up and if your going to spend money on heads, spend it on aluminum (unless you find 820 heads for next to nothing and you have a machinist that works cheap).

As for where you are now, the only thing that doesn't ring true is the cam selection. You have more lift than you can use with those heads, and the long duration may decrease your dynamic CR, thus decrease horsepower/torque.

The guy at the machine shop called comp cams and told them what we were building and what the application was and that is the cam that they ground for us. Hmmmm. Hope they know what they are doing.