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la motor against 604 crate shivvveyy????

Discussion in 'Performance' started by geezer, Jul 28, 2015.

  1. geezer

    geezer New Member

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    going back dirt late model racing...limited class on flat 3/8...2300 lbs...main completion would be 604 crate chevy.....I raced 360 in imca car with almost stock junk heads and still ran midpack against chevy 350s with much costlier heads....in this deal 362" is limit so a 360 is out unless I sleeve or get a new block...all costly...so a 318 at 30/40 with the cast 3.58 crank would be safe under the limit...with off the shelf big valve heads with limited porting give me 400 hp or would the new x/w2 heads be needed? flat tappet cam...750 holley....any thoughts? 340 blocks are available but 318 stroked seems to look the best to me
     
  2. GLHS60

    GLHS60 Well-Known Member

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    Do you follow Engine Masters Magazine?? The editor is a real Mopar fan and did several LA builds over the years trying various combos and even his low buck 318 made 400 H.P. He did a rocker arm comparison and found the stock light shaft rockers to were stable for a few hundred RPM more than quality rollers on hydraulic lifters, approx. 6600 as I remember. Your post reminded me of my dirt track days !!

    Good Luck!!

    Thanks
    Randy
     
  3. geezer

    geezer New Member

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    I had forgotten about that engine masters...been out of the game awhile...I may just try it...now I need to find a charger/challenger nose for my toy!!...thanx
     
  4. dana44

    Ad-Free Member

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    The stroker 318 will get you to the 400hp range without any problem, and you can throw 2.02 intakes in there, too (318 bore can handle them), get the compression up and remember with the 360 stroke crank, external balance, 318 is internal balance, so when it comes to balancing the crank, throw the harmonic balancer and flex plate on it. One thing you can think about is the 5.2 over the 318 is the roller cam. You can get a whole lot more aggressive with the roller cam than the flat tappet, you have 1.92 intake valves (or Aeroheads and a few other aftermarket heads that port really well, although I do like the W2 but there is a lot of extra parts needed so it gets really expensive to set up), and isn't there a small block Commando head, a cheap W2 head of sorts, takes all stock stuff with 2.02 valves (they port out realllly nice). Yeah, 400hp is an easy goal actually. You don't need no stinkin' 604 chivvy.
     
    jerseyjoe likes this.
  5. PCRMike

    PCRMike Well-Known Member

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    The Iron Ram head (LA-X) is a great aftermarket, high flow, stock looking head. About 600 bucks assembled at last check.
     
    MoparDanno likes this.
  6. dana44

    Ad-Free Member

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    Yes, them and I believe it is Aero, makes a good cast iron aftermarket head that outflows stock, ported is also wonderful on top of it. There is good power to be made from some combustion chamber mods, an easy 75hp out of that work alone, done it several times myself.
     
  7. pt006

    pt006 Active Member

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    Geezer; I'd go with a 71 or older 340.
     
  8. thatoneguy

    thatoneguy Member

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    Mopar does have a Commando head. I also looked into that option. The flow for the commando is superb but when I called a local dealer here they said price would be $1200 per. So my budget says thats a bit pricey compared to the EQ option but EQ's are gonna use pedestal mounted rockers if I remember correctly... So I hear the stock LA Rocker shaft is better in some respects due to not limiting the overall lift potential that the mag 318 heads have before running into collision issues. In that case it depends on which is prefered...If using LA w/ roller cam machine work i've been told is needed, for the Mag head machine work would be needed if going over .500" lift. Unless you go Edelbrock I think they tap out at somewhere around .600". EQ's run about $340 ea bare so budget wise they are one heck of a good option.
     
  9. GLHS60

    GLHS60 Well-Known Member

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    I found the Engine Masters magazine with the 318 build, Winter 2006, vol. 9, no 4. They built a 302 Ford, 305 Chevy and a 318 LA and the 318 was easily the winner at 415 H.P. and could rev 6600 RPM.
    Nothing exotic, zero decked the block with KB 167 pistons, XE275HE flat tapper hyd cam and early 360 smog heads with 2.02 intakes and a clean up. Great build with torque/HP charts from 3600 to 6600 RPM. It seemed like they hit a good combination, later builds with roller cam and better heads only increased 10 H.P.

    Thanks
    Randy

    http://www.magazineexchange.co.uk/engine-masters-magazine-winter-2006-issue.html?&cat=4684
     
  10. dakota21

    Supporter

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    Being a dirt late model fan, I've always wondered about running a modern hemi engine in a late model. I'm sure it would be expensive but, anyone ever heard of doing this? Is it even legal?
     
  11. pt006

    pt006 Active Member

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    Geezer; a 360 bored .030 over would yield 365.+ cu in. I would lobby for a 366 cu in limit. Or better yet. Add a rule that a .030 overbore is allowable on a stock block with under 362 ci from the factory. But why 362 ci ??? It doesn't seem right that 350 chevs and 351 fords can overbore their motors but Mopars can't.

    dakota; That is the question I too would like answered.
     
  12. awyseguy

    awyseguy Well-Known Member

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    I know our local dirt track for years had NO HEMIS in large print in the engine rules. They were as adamant about that as the Derbies were to NO CHRYSLER IMPERIALS. But I agree, that I'd like to see a 5.7L Hemi in a class like that, put a set of 6.1L Heads on it with a better cam and unravel some bow ties
     
  13. mr5racing

    mr5racing New Member

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    we built a 365 for our Pro Stock division. after extensive testing on the dyno with stock heads, many stock intake manifolds and a handful of exhaust manifolds we got to 380hp with a 4412 500cfm carburetor and 1.925/1.60 valves. so is 400hp attainable with a 360, which is the block I would use? without a doubt. id run the W-2 heads as well and get another 360 block.
     
  14. Moparm880

    Moparm880 Member

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    There are plenty of 360/5.9 out there that the stock bore is fine..
     

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