calling mopar small block gurus!!!!help needed

AJ is correct.

I know of 360s that run REAL hard with 1.88 int valves. They aren't turned harder than 6000-6200 rpm and they run juice cams with ported J heads, but they run real hard. I have seen them go high 11s in a loaded A body at 3300lbs. The 3.58" stroke is great on the street for usable TQ.

From my experience, they are'nt as sensitive to CR as Brand X but ARE sensitive to good cyl heads and exp exhaust as the J head exh port leaves a bit to be desired, esp in the floor of the port.

My own 360 has 9.5:1 CR, cleaned up J heads, 2.02/1.60 11/32" valves, 1.5 rollers, std stroke, KBs, prepped std rods, a Hughes solid cam (a bit too much duration @.050" for the CR, looking to swap) and is .030 over with 1 3/4" headers. Runs an Edelbrock LD340 (as good as an Eddy Air Gap) and a 750 DP Holley. Runs real hard and may be hitting the track in a month or so for a bit of fun.

On the 318 front do a Google search on "318 Mopar combos" and you will uncover 400+ HP 318 combos that work and won't break the bank.

Rat

 

Gary Pavlovich is a regular contributor to the 62-65 Mopar mailing list, if you want to ask any specific tips. He also comes across parts for polys occasionally.

 

well im not getting the engine after all
butttttttttttttttttttttttttttttttttttttttttttttttttt
i am trading my 75 chevy stepside and some cash for a 73 scamp with the all mighty slant 6 and use it as a daily!

 

Which engine is better to get more HP out of and which are easier to get the speed parts for ?

 

the engine(318 from 75) in the car now is the easiest for performance and parts so thats what im sticking with

 

I completely disagree; throw your 360 overboard into the ocean.

on "having 340 heads" in the OP it said has 340 heads WITH it not ON it. and yes if it IS a 318 and it IS a 65 it HAS to be a Poly! this engine went to 66 in US and 67 in Canada before the LA version replaced it.

 

either way im better off
im going to get a 340 block and build a stroker for my next build!

 

And you have something better? anytime you want i have a "anchor" that will prove you wrong!

 

If your planning on building a stroker small block Mopar, might as well start with a 360 block, they will be easier and cheaper to find then a 340. Once the original parts are removed and replaced with aftermarket parts, any advantage a 340 may have had over a 360 will be gone. Save the "block" money for important things. Been there, done that. Gene

 

i've got a 415 inch stroked 360. 4 inch crank from Ma Mopar, eagle rods, RPM intake, 292 cam, Indy valvtrain Edelbrock heads -stay AWAY from these heads if you want REAL power -unless you know a good head porter. They are only a "good" "street" head, an ok "hotrod" head- if you want to really use that mill get W2, W5, W9 or check Indy's Windjammer heads etc...

Eddy heads choked my engine down to 462hp/4800rpm and 520lbs/3800 on the dyno. 292 on a 108 cam is old school but still willing to rev much higher than the heads wanted to breathe.

I say go for it, new stroker cranks are CHEAP, put the money into GOOD heads and let 'er eat! -rick

 

Obviously, you haven't priced 340 blocks yet...Use the 360, as said many times, it will be the best bang for the buck.

 

well heres the numbers off the block
AAQA
2468230
10-7-65
and etched in near the waterpump B 318 1229 040

and on the heads on the back/side of the head theres a big L
but inside the head theres small initials MWJ

but im fixing the floorpans in the chevy and trading for the scamp but im trying to run the numbers for the guy anyway

 

so ive been reading up on allpar.com and apparently its an A 318 and the only real difference is the heads
so it looks like that engine is a good engine...but im still not sure
im more confused than ever about it
A-318 3.90625 3.3125 317.6 1957-1967
LA-318 3.90625 3.3125 317.6 1967-2002

 

Yep !!

Good 340 blocks are pulling good money.

71-73 360 blocks are real good as they are supposedly thick wall castings. Ive seen a few go to a 4.100" bore no sweat. .030" t0 .040" is better - leave room and stiffer cyl bores.

Rat

 

Here is my 360 block.

 

OK, once more. The A-318 is the Poly block. It has wider heads and a wider block to accomidate the wide heads. They were good engines, but many parts from the newer engine will not interchange. The stroke and bore are the same as the LA 318 engine, and some bottom end parts interchange, things like cams, heads, rocker gear, and exhaust and intake manifolds do not.

The LA-318 is the newer 318. It is a more compact design to fit into the mid 60s smaller car engine compartment. The LA engine series first began with a 273, then grew to the LA 318. The 273 went away shortly after the LA 318 arrived on the seen. About the time the 273 went away, the performance orentented 340 came into existance. The 340 came factory equiped with many high performance parts and larger port heads. It was based on the LA 318 block and had a larger bore with the same stroke as a 318. The largest small block engine was a 360. It has a smaller bore and longer stroke then the 340 it was designed to replace. A 360 bore is between a 318 and the 340 bores. A 360 was designed as a smog engine with low compression, smaller valve 340 port size heads and a large main journal cast steel crankshaft. The La series 318 and 360 (except for a couple year absence for the 360) carried on until the Magnuim engines began.

Because the 340 was an optional factory performance engine and had a realitive short production run, it brings a much higher price then a 360 which was produced in large numbers for many years.
Hope this clears this up for you. Gene

 

So...going back to what i said in post #2, you have a 318 Poly. You'll need to find 318 Poly heads & top end stuff. Depending on a sonic check, you can stroke & bore it from 349 to 402(apx). You won't have a SBC belly button engine!

 

The 318 LA could be had in '66, not prior. My '66 Fury had a 318 LA and it was the original mill.

Set a head on the block it may be that the fella you got the mill from was mistaken as to the year. There is an awful lot of that going around.

400 HP from a 318 is a stretch. Bored and stroked it is possible. We used to run 'em with a 360 crank on the short track cars. They got pretty healthy but I'm not sure that there were 400 ponies hideing in there. Lots of torque though.

Throw a straight edge on the block and on the heads to see if they need to be straightened, decked would be what gets done to the block and the heads would be milled or shaved or???

 

we tried to put the heads on and they didnt fit for crap
the guy who he got the engine from has the original heads that were rebuilt..i told him to go get those and then rebuild it all

how much are j-heads worth?

 

As George, and others, have said, you have a 318 Poly. Interesting that it has a very similar date to one I have in the shop right now...

The poly is an excellent engine. Chrysler changed the design to save money on the manufacturing side, not because it was a bad design. The same reason that the Hemi was replaced. MONEY.

Yes, they can make 402 inches; yes, they can make 402 hp.
No, you will not have, 'just another small block'...

Go Here: http://autos.groups.yahoo.com/group/318poly/

Talk with Gary Pavlovich. Tell him I said HI.


.

 

Wrong, wrong, wrong. The LA-318 came out in the 1967 model year. Period. Dot. It could not be had in a 1966 anything, because it was not available then. Poly 318 only. NO LA 318 in 1966.

Again.

That Poly 318 can be built to be a screamer, as stated above. The Poly heads flow much better than the factory LA-heads. And Gary Gavolich can set you up to get that Poly engine like you've never seen a Poly before! Think...402 cubes from what the uninformed consider a boat anchor.

 

well when i to,d the guy the news he was gonna sell the j-heads ands scrap that block
should i try and buy the block and such off of him for cheap?

 

I'd try to get it, if it was me.

 

Hey Mak, how manny 318's you want? got quite a few A & la's.

 

Looks like I found this one a little late... maybe that's not such a bad thing.

~Jason

 

Hey Jason where you been-asleep?? All the OTHER Poly experts have sorted this one out without you LOL

swifty

 

LOL!

Asleep, or sitting this one out just to see just what the "experts" have to say!

~Jason