318 combos?

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318
360heads
kb 399 pistons
erson.488 .510 same spec. as the edelbrock rpm.
rpm airgap
650 dp holley
it put my sons dart into the 12s 12.90.
 
my 318 -( wanna b 340) has 273 heads for better(smaller cc) qwench with enlarged ex/ports- a 69 340 factory cam & lifters & correct springs - newer flattops - 30over -Bal&Blu- heads 10 off with an eddy RPM & tweeked factory carb with K&N on top all lit up with hidden -pertronix ignition- zapper coil - 904 with shift kit -391 suregrip turning 275's x15,s - ported the hi flows heads helping add flow with 2.5 in dual exhuast -dynamax trac pak free flow mufflrs and she whistles dixie all the way down the trak - faster than any stock 340-- YUP.... plus the BONUS --she still passes aircare emissions =that SH%&69$FNKbc moneygrab regs ---without messn with detune tinkerinyeh= SB rules when done rite= dont chase the competition - i think i could have stepped up the pistons 4 better compression - but what the hey - it aint broke and is some supr fine fast runner.. Udont have 2 do just what i did - many doors are there to open - my build was done on a "poor mans" budget 4 about 3K and dont need to look 4 a BB conversion -its either build it yor way or get that crate 360-stroker 408 ? - good luck either way C U this summer -
 
There are a TON of threads on this. Look in the SB subsection of the engine forum for some, or do a search.

300-350hp is pretty easy to accomplish with a rebuilt 318. The basic formula looks like this...

Bore and zero deck the block

Select pistons to get you around 9.5 or 10:1 on the compression ratio (kb167's are a popular choice for a street engine)

For 300 hp you can have your stock 318 heads fitted with some 1.88/1.60 valves, and have them port matched to the intake. A little clean up on the ports would be good, but I wouldn't waste money having them ported (see below)

For 350hp or more, look at a set of magnum heads, or the new rhs x heads (400+ hp)

Edelbrock performer rpm or rpm air gap for an intake

Lunati 60402 or 60403 or similar on the cam, depending on your brand preference.

Dual exhaust if you don't already have it, manifolds are fine for 300 hp, headers if you're going bigger.

Here are a couple magazine articles on 400 hp 318 builds...
http://www.moparmusclemagazine.com/techarticles/mopp_0409_318_engine_build/machining_process.html

http://www.hotrod.com/howto/113_0304_318_small_block_build/index.html

And seriously, do a search. Good luck!
 
bluNblu is right on. That's the recipe.
 
LandonE said:
I've got a 318, and i wanna get more HP/Torq out of it.
I wanna make around 300-350hp.
Thanks!
Click to expand...

here's the setup that i ran for several years, ran a 14.00 in a full interior, 74 dart on motor.

9.75 to one KB pistons
elelbrock performer intake
lunati 520 lift cam, hydrolic
750 DP holley
port/polished heads
flowtech headers
2.5 exhaust through flowmasters
and i used a holeshot B&M (although i'd advise a TCI 3000+ to you
3.91 gears with a posi.
electric fans.
full manual valve body in trans.

14.00 is very good for a full interior, street trim dart...
i ran a 12.90 with a 125 shot of nitrous...the guy above that claims 12.90's on motor, possible, but very unrealistic for your typical build, my 318 might have run 12.30's with a 4000 foot stall converter on the bottle..but again, very unrealistic for your build..a street dart that can turn 14.00 is very respectable fun, realistic build that i had fun with for years...enough to have fun at the track, mess with some ricers on the street, and make some noise.

but take our advice for what its worth and good luck and have fun ; )
 
Thanks everyone.
I wanna try and go with the stock heads, and if i don't have to, not pull my motor. Although, I'm going to do a compression test soon, and depending on the compression, i may pull it, and rebuild it to how i'd like it.
 
My 318 that I'm in the middle of building consists of:

-factory shortblock that was bored .060 over with stock cast pistons about .060 down in the hole...LOL (again, it was a stock rebuild by the previous owner)
-RHS heads with a 62cc chamber and 202/160 valves to bring the compression to about 8.9to1
-hughes 1.5 roller rockers,
-edelbrock performer RPM manifold
-edelbrock performer RPM cam & lifters 234/244 dur @.050 488/510 lift (not the best cam but using what I have)
-holley 600 spreadbore carb
-comp cams double roller timing chain with a chain tensioner and a MP windage tray and MP viscous fan
-Dougs headers with 2 1/2" exhaust with flowmaster mufflers

the limiting factor on my engine is of course my lousy compression, and the lazily ground edelbrock cam....id be happy to get about 325 horsepower out of it...what do you guys think?
 
mopardude318 said:
the limiting factor on my engine is of course my lousy compression, and the lazily ground edelbrock cam....id be happy to get about 325 horsepower out of it...what do you guys think?
Click to expand...

If you're compression is really at 8.9:1, its not that bad. Obviously a little more would be better, but with the pistons .060 in the hole that might be hard to do. What thickness head gasket is that with? Mopar is reproducing a .024-.028 compressed thickness gasket now, Mancini has them. Worth almost a half a point over a standard .039 gasket.

I think you're in the ballpark hp-wise. The biggest limitations of the 318's were a stock compression that was actually more like 8:1 or less, and anemic heads. The RHS heads flow VERY well, and a compression ratio at 9:1 (or even close) is still better than stock. You might be able to do a little better with tuning, but the cam is going to limit how much advantage you ultimately get out of the heads. Cams aren't that horribly expensive, if you've already bought the heads you might as well bite the bullet and get a decent cam to run with them.
 
72bluNblu said:
If you're compression is really at 8.9:1, its not that bad. Obviously a little more would be better, but with the pistons .060 in the hole that might be hard to do. What thickness head gasket is that with? Mopar is reproducing a .024-.028 compressed thickness gasket now, Mancini has them. Worth almost a half a point over a standard .039 gasket.

I think you're in the ballpark hp-wise. The biggest limitations of the 318's were a stock compression that was actually more like 8:1 or less, and anemic heads. The RHS heads flow VERY well, and a compression ratio at 9:1 (or even close) is still better than stock. You might be able to do a little better with tuning, but the cam is going to limit how much advantage you ultimately get out of the heads. Cams aren't that horribly expensive, if you've already bought the heads you might as well bite the bullet and get a decent cam to run with them.
Click to expand...


Hey thanks. Brian at IMM told me not to use a thinner head gasket. Wouldn't help as it would create other problems, too much velocity in the heads I think? I don't remember...But the engine is already together and ready to be installed....I will run it for a while, and see if I like it...Its already a tired block bored 060 over that was done previously and I just did a hone job, and cleaned up the old pistons. lol.

Sorry to hijack this thread about my post, but maybe my engine specs (and shortcomings) will help what and what not to do....(don't use edelbrock cams! lol) I shoulda went with a comp mild solid flat tappet. :)
 
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