Today, dollar for dollar, is the 318 faster than the 340 ???
- Thread starter 318willrun
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Well, you seem one dimensional.... as in how fast can I pass through the 1/4 mile. I like that also, but I don't like all my car rides to end in a mere few seconds. We venture out for hours.. and sometimes days. We just got back, by the way...
It’s just a cam and intake on a truck long block 5.9l, air gap and a 230 .500” ish cam should get ya close.
Or cut guide for more lift, more cams to choose from.
448Scamp
Running Free
That’s a cool car, even with the two extra doors. I could cruise that from coast to coast and enjoy doing it.
I would have too, back in the day. I'd rather jump in my wife's Durango RT for the road trips these days.
True don’t know if I’m right or not but always felt going a bit over your gonna spend more average time in the top 90% of the flow like if you have peak flow of 200 cfms @ .500” lift and around 180 cfms @ both .480” and .520” a .520” or so would give more average flow plus you go through the peak twice, could be wrong.
448Scamp
Running Free
Dave_J
Well-Known Member
UTAwesome has a TECH page where he has spent a lot of time flowing and Dyno testing a 5.9 with CRACKED stock heads. He's only getting 397 HP out of a slightly modified 5.9..... 397 HP At the rear Wheels of a 4X4 Ram, not crank
UTAWESOME PERFORMANCE
UTAWESOME PERFORMANCE
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Who is UTAwesome ?
They can do 400HP, but it's not gonna be anywhere near as easy as it will be with a 360. Now....a 325 honest HP, you can do pretty easily and is enough power for a reasonably quick street car if it's a light A body. In fact, I'd go so far as to say it'd fare well in most street battles with the right gearing. Problem is most guys are too pussified to use the gear it would take.
Is this 318 thing limited to LA motors? What if I put 3K into a poly and mop the floor with all yall yahoos?
Does anyone grind decent poly cams anymore?
Oh hell yeah. Camcraft will, Scheinder will and there's one other company that specializes in them. Ken Heard at Oregon of course will, too.
Chit....I tell you what I would do. The 360 crank is a direct drop in I think with the exception of the main journal size.....so that means the 4" arm will slap right in it. ....and several have been built. That Gary Pavolich dude is the poly guru and has done it. MEGA stump puller with ported heads and big valves.
Read all about it.
Building a Polyspherical (Poly or Polyhead) 318 Mopar Race Motor
Sounds like a good combo. Now if I remember correctly? Poly heads will bolt onto a la block and vice versa but the poly heads have to have a poly cam and la heads have to use la cam. And if memory serves correct the poly oils through the pushrods
No, I am almost 100% positive the Poly heads will work off an LA camshaft as long as the pushrods are correct. I see no reason why they wouldn't. Valve arrangement and firing order are the same.....of course with the exception the valves are splayed on the poly. Unless I'm missing something, I cannot think of any reason why the LA camshaft would not work in that situation. I think they are each block specific. I could be mistaken, but I think that's right.
@Bighead440 might know. He's pretty sharp on that stuff.
I don't know.....after a quick search, it appears the heads will not interchange.
I think you may be right about having to use the poly camshaft, too. Hell, just build the poly and bee did wif all dat, yo. lol
dirty white boy
50 yr old Juvenal delinquent
i know the cranks will change back in forth...thought them heads did to!
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I think the poly heads have 2 water passage holes about an inch in diameter that you have to plug up to go LA.
Just put the 340 4 inch stroker crank with 360 Pistons that would be 4 inch Pistons in the poly block. The 318 poly can be bored to 4 inchs without a problem
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