View Poll Results: which motor to build?
- 37. You may not vote on this poll
22-11-2008, 02:25 PM #1
390 Mopar stroker or 355/383 Holden stroker???
hey have a dilema, i have for my 3rd year TAFE engine rebuils assesment to motors to choose from either a 318 small block chrysler which has had some hotting up in its life already or a 308 which i belive to be standard. both motors belong to my old man.
now my problem is not brand choice i love them both, but the cost of building one of them. if i was to go holden it'd have to be inject coz then i would put it in my VN. and if i was to got mopar it'd go in my old mans CK CxC or a one tonner. sacriledge i know but i've always wanted to do it
so please vote purely on cost and performance charcteristics. and please put down some cost effective performance ideas below.
and PS please vote unbiasedly towards brands
22-11-2008, 03:50 PM #2
383 you can use it when finished and no substitute for cubes.
22-11-2008, 03:55 PM #3
On cost (well mine didnt end up cheap) i would pro say 355 if you by a COME kit or something sim.... Prostroke or which ever... But i would also love to see or hear how some1 goes about stroking a 318 as im building 1 up for my old mans VF Regal only mild though cam and mild porting... And i havent realy got prices but i beleive the chrysler parts would be harder to come buy but dont hold me to that!! If any1 knows different let us know.
22-11-2008, 04:25 PM #4
holden vs chrysler strokers...........pfffffft dont have to machine reliefs for counter weights in engine block, higher camshaft to deckheight valve train, which equalls stability under RPM. 6.125 inch rods as standard. and the list goes on......Vn heads you say vs 318..... then ill say 318 Magnum heads which are standard heads from about 84 on its just chrysler was defunct in this country remember.... you say anything other ill say W2.... sorry no contest.....
22-11-2008, 04:36 PM #5
thats because they are all massive barges and need the performance.
22-11-2008, 05:26 PM #6
23-11-2008, 09:20 AM #7
- Join Date
- Aug 2008
360 block, 4 bolt mains mod, flat tops, solid cam, ported W2 heads, factory adjustable rockers, good set of extractors, Weiand tunnel ram & twin 425 mixers (keep the old school look).
Now that would be a nice motor
23-11-2008, 05:21 PM #8
26-11-2008, 07:33 AM #9
I already have a 355 motor for my car, but I have always had a soft spot for the pentastars, and a worked pair of W2 heads are a nice move as well, the 360 blocks were fairly easy to come by because too many paople thought they were a slug, but it sure as hell didn't take much to wake them up. I also must admit that I am still in love with the six pack carby setup on the Mopars as well, mind you I am also a firm beleiver in big blocks as well, but that is getting away from the subject.Если вы хотите власть тогда будет стоить вам везде вы идете.
26-11-2008, 07:42 PM #10
the 318 i have to use supposedly has a set of J heads on it how do they differ from W2 heads. and new question, how hard is it to retro fit fuel injection? providing i can get the factory ecu for a decent price from the states. aaahahahahahaha thats not gunna happen anytime real soon
also i was thinking straight gas
26-11-2008, 09:16 PM #11
J heads are an open chamber head, designed for 340 and 360 engines. W2 are a factory head and the most adaptable to all SB LA engines ( mag and pre magnum ) .........from there they increase from W2 to W8 which basically are a block of aluminum. in which you CNC your own combustion chambers and so on, and are found on the most power full SB engines in the world. at the price of your children. and arent compatible with pre magnum LA small blocks.
Retro EFI ??? Dont waste your time, Buy a Magnum 318 first time.... cheaper than an up sized burger at McDonalds. as production of then has really only just stopped now. same engine mounts as the LA blocks, and are same externally so its a bolt in, the valve train is different though, they can be adapted to LA engines but with the help of further machining. - Im not refering to the Chrysler 300 engine. this is something completely different, and i know nothing about it.
26-11-2008, 09:45 PM #12
so which is better for performance? j or w2? where would i find w2 heads? which ones don't i have to touch for flow characteristics
27-11-2008, 10:17 PM #13
ok so far this is the only 390 kit i have found but its only the bare rotating assembly no bearings or gaskets. if anyone knows what involved in stroking a mopar small block i would like to knwo before i start buying parts for it.
21-01-2009, 10:42 PM #14
how did you get on with your build. I was surfin around and a link took me to your question
22-01-2009, 09:45 PM #15
Theres about $1800 Oz in parts in that kit, and there are better options than those expensive Diamond slugs
Putting aside the more exotic stuff, to build a strong 390 (like any stroker) you need heads that will flow well, aim for around 230- 260cfm depending on your cam, and a port volume that is no more than about 170ccs or you'll lose velocity. I'd be wary about using a valve bigger than the Hemi tulip 1.96, but some reckon the 2.02 is OK in the 318 bore.....(Some reckon shrouding is a problem......although it isnt in an LS1 and their bores are tiny.)
Eddies, ported cast 360s (Js tend to yield better results) or EQs will all work, but all will need some $ spent on them, depends on your budget.
There are three off the shelf slugs available - the Diamond Forged (which are big $$) or the KBs 846 or 847 forged slugs. (Campbell enterprises sell them all)
Mopar factory 360 rods are good to 500 HP so you dont need to swap out your rods if they are the 360s....318 rods are a little lighter so some Eagle I beams will cover you, or buy some NOS 360s off Ebay for $50!!US.
ARP rod bolts and main studs are a mandate. No need for a 4 bolt cap, the Mopar block casting is good to 6500 rpm/ 500 HP (probably more) before even thinking about it...
A splash tray and deep pan are also a must if you're racing.
Eagle 4" crank from $299 US represents good value. They're cast but because they are a Mopar bearing size, good to 500 FWHP.
You will have to notch the bottom of the cyl bores slightly if you run factory 360 rods, I beams will clear no problem.
Running 240cfm heads (Eddies are probably the pic of the bunch for $ value), and a cam thats 242@50 with .520 lift will see around 440 FWHP,
Pick a cam from a company like Hughes, Scott Brown or Comp who profile their sticks to take advantage of the wider fast ramp Mopar lobe profiles.
Factory Mopar shaft adj rocker gear will be fine, but use Crane lock nuts or lockable adjusters and match the springs to the cam makers recommendations (around 120 seat, 320ftlbs open with my suggested profile)
You'lll need a 750cfm carb, and either a very good DP (Air Gap or M1 DP) or a SP, depending on what you're chasing and your gearing. A HV mechanical pump or better, a 120 GPH electric Carter. The factory fuel line will be at full stretch, it depends on the cam.
Pacemaker headers and a twin 2.5" system will be fine...but use Magnaflo mufflers, Flowmasters are for the Cheb crowd and they flow 25% worse than Magnaflos......(Flows also sound like crap)
Minimum 3.9 gears using a Fud 9" or better still, the 742 case 8.75 Chryslerr from a 68-70 Dodge Charger will slot right in your CH. (Thicker pinion shaft than the Ford)
This is a basic summary of my current build in progress, the ftlbs make the SB strokers devastating on the street, and Ive been reliably informed that a similar 390 build to above (with a 244@.50 cam with .540 lift) runs high 11s in the US...no gas or FI.
The up side to the Mopar is the strong bottom end, and strong rocker gear.
The down side is cost.
The car below ran high tens with a 360, no gas, with modded factory J heads through Magnaflos and a CAST crank and factory rods........just so you know how tuff Mopar stuff is (it has to be because our cars are such barges....)
YouTube - Theo 360 Mopar runs a 10.8
PS - I do some parts importation on the side so if you want to go ahead..IM me and Ill see what I can do to beat up the taxman.
Last edited by Rat Patrol; 22-01-2009 at 10:09 PM.
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