ok i am building a 318. sofar the block is bored 40 with basic rebuild kit pistons with 4 valve reliefs ,stock crank and rods,360 non smog heads ported and polished with1.88 1.60 valves shaved 20 to keep compression close to stock as i dont want to have to run high octane gas, edelbrock sure seat springs .444 lift torque cam, headman 1and 5/8 headers,stock 340 iron 4 barrel intake, and a 325 cfm avs carter. i am goin to run a stock set of rockers for now and try to go with some 1.6 roller rockers later on when i get the . i just want an estimate of what kind of horse power im lookin at with this setup, im shooting for around 300 to 325.

 

Sounds liike you have a good build going on. Good post. Plenty of info in there.

Couple more questions: Are these parts in hand or are you still doing a theoretical build?

You CAN meet your goal of 300plus but I dont know what a torque cam is? And are you class restricted to the 325Carb?

 

mad -

First thing you have to do is define HP as at the flywheel or to the ground (rear wheels). The difference can be 100 HP.

With what you're describing, seriously doubt you'll be anywhere near 300 HP, even at the flywheel. You're basically building a stock engine with improved breathing (head work and headers).

You're going to have to look at cam specs and possibly a better induction system for the HP you're looking for. You also didn't mention balancing short block.

Archer

 

http://www.hotrod.com/howto/113_0304...d/viewall.html

Here you go Mad.

All bone yard used parts.. No high tech anything.

 

yes the parts are ready to be put together the heads are back from the machine shop the short block is built and no its not balanced its just a basic rebuilt bottom end bored 40 over. and im looking at flywheel hp i understand it is different at the rearend and i do have other carbs laying around i have an edelbrock and a few old holleys all probably need rebuilt and im not sure what cfm they are. the 325 cfm carter is ready to go tho and this is a budget build so my is limited right now.im just tryin to figure how much this is going to help when i press the pedal.

 

mad -

Don't put a lot of weight on that article that PK linked, Hot Rod and most other "sports" magazines have a habit of either trying to sell you everything on the market or telling the reader what they want to hear. It's all about marketing. We did a lot of basic rebuilds back in the day, and you had to do a bit of work to get a 318 over 300 HP, or at least be fairly lucky.

The only way you're going to "know" for sure the HP your getting is with an engine or chassis dyno. Most guys are pretty surprised when then actually try that. Again, you can easily loose 100 HP between the flywheel and the rear wheels.

Sounds like you're going to end up with a good solid and drivable motor. The carb is usable, but probably not optimal, just something else to think about down the line.

Archer

 

ok thanks i was just trying to get a ballpark figure on what i was looking at im going to start trying to get the motor installed tomorrow. it is going in an old pickup that i will mainly use for towing hauling and playing in. i may try a different carb later on. i also want to ditch the points and get a ready to run hei distrbutor and possibly some 1.6 roller rockers later on, a lot of people seem to like this upgrade when running a smaller cam like i am. other than that i was just tryin to figure how much bang im getting for my buck. i also have a 96 ram with a stock 360 magnum engine to compare it to and my father in law just bought a 2012 ram with the small 345 cid hemi but i havent drove it myself. if the old 318 la block will hang with these newer engines i will be pretty satisfied.

 

mad -

I think your initial thoughts were correct about using a "torque" cam, meaning one that makes power early on in the rpm range. For towing, you might want to confirm what your diff gear ratio is.

Archer

 

dont spend money on a 318 to built a performance engine, take the money and buy a 360 and you get more power out a stock like that..

 

love to see some info of your project in pics dude?

 

i meant 625 cfm carter not 325 i dont know why i put 325 but the truck is running now and i wound up using a 600 cfm edelbrock performer and it gets down the road pretty good

 

What do you have for a tranny? Is the truck 4wd or 2wd? 1/2 or 3/4 ton?

Also, when it comes to towing/hauling, you shouldn't be worried too much about HP. what you really want is torque. That is what is going to help you "get up and go". It sounds like you built a good motor for that too.