Deciding on replacement intake (318, details in post)

[273]

he's already mentioned finding a 360 here in the uk is much harder than in the states, hence the 318 build.
neil.

I understand that, just was agreeing with your basic premise.

 

[J1MMY]

who told you a stroker won't rev? at 3.95" bore and 4" stroke it's pretty much 'square' after all. revs are down to cam, heads, induction and exhaust as you know. the limiting factor with a higher hp/revving small block mopar is heads not stroke. the reason some say strokers won't rev is they don't know what they're talking about. yes a stroker can make the same power/torque at lower revs as a stock stroke motor, but you then have the potential for more hp/torque if you build it for revs.
lastly is your 318 already in a high state of tune? you say 'keep it a screamer' but a 318 was never that from the factory. did you say your intended useage of the car it's going in? unless it's a dedicated drag/race car how often (be honest) will you rev it past 6k anyway? if you build for best power at 7k and it's primarily a road car you may be dissapointed with it's road manners.
neil.
ps have you spoken to dave billadeau for advice and parts?

It’s your old Valiant.

It wont be seeing a 1/4 mile ever again, it doesn’t interest me. It may well wind up slung around tracks of a different kind though…

No I haven’t but the name rings a bell. Who is he again?

 

[junkyardhero]

lastly is your 318 already in a high state of tune? you say 'keep it a screamer' but a 318 was never that from the factory.

from post #1

Current engine/drivetrain in my valiant is as follows:

318
167 KB pistons
360 heads ported
Lopey Isky cam (exact spec unknown but it seems there’s only 2)
Solid lifters
273 rockers
HEI distributor
Tunnel ram w/dual 450 carbs
Long tube headers
4 speed
3.91 explorer rear w/locker

 

[J1MMY]

from post #1

Except it didn’t prove to be quite what was first believed (cam and pistons, heads only appear to have been ported to the gaskets).

Neil should know the engine, he put it in the car years back.

 

[273]

heads only appear to have been ported to the gaskets).

Ya I noticed that, that's the main power cork in your combo.

 

[mygasser]

It’s your old Valiant.

It wont be seeing a 1/4 mile ever again, it doesn’t interest me. It may well wind up slung around tracks of a different kind though…

No I haven’t but the name rings a bell. Who is he again?

he builds (for a living) and races mopars and has for many years. i've pmed you his number on here.
neil.

 

[J1MMY]

he builds (for a living) and races mopars and has for many years. i've pmed you his number on here.
neil.

Cool

 

[mygasser]

Except it didn’t prove to be quite what was first believed (cam and pistons, heads only appear to have been ported to the gaskets).

Neil should know the engine, he put it in the car years back.

ok, then i'd go 4" stroker for 395 cu in and decent ally heads. that 318 ran a 13.2 1/4 mile in another 68 valiant also with a 4 speed.
neil.
edit the 600 holleys got swapped for 390s by mark who bought the valiant from me.
neil.

 

[J1MMY]

Ya I noticed that, that's the main power cork in your combo.

Nothing worse than a cork in the combo!

Nothing to lose, everything to gain - and a job to add to the list.

 

[dirty white boy]

there's no replacement for displacement!! your planning on using good heads might as well use them to there full potential.....DWB

 

[273]

there's no replacement for displacement!! your planning on using good heads might as well use them to there full potential.....DWB

sure there is, RPM and or Boost and or Nitrous etc...

 

[J1MMY]

sure there is, RPM and or Boost and or Nitrous etc...

Oh don’t. I’ve had plenty of ‘helpful’ local enthusiasts nag about turbocharging the 318.

 

[J1MMY]

I’ve actually be

sure there is, RPM and or Boost and or Nitrous etc...

sure there is, RPM and or Boost and or Nitrous etc...

I’ve actually been mulling this over and it’s not such a mad idea. I’d want to build the bottom end (crank, rods, oil pump etc…got forged pistons) anyway regardless of the application and improve upon air flow.

Fuelling is easily enough taken care of - I’m not new to working with OE and aftermarket injection and management systems

Oddly enough there is a ‘kit’ for sale over here which was intended for SBC but I do have some Mopar header flanges and a welder….

I’d better make a cuppa and calm down.

 

[sireland67]

Well that changed, from a simple intake change, to an engine rebuild.

 

[J1MMY]

Well that changed, from a simple intake change, to an engine rebuild.

It did but I’m fine with that and it’s not just the engine, the whole car is being gone through. That way I’ll not only know it front to back and inside out, I’ll have rectified all the other little nuggets of tomfoolery and neglect that has been inflicted upon it. Do it once, do it right.

 

[J1MMY]

Well I only went and found a 360! Straight from the engineers - dipped, crack tested and inspected. Also came with some 596 heads (1.88/1.60).

Now to form a solid plan…

 

[mygasser]

sent you a pm jimmy.
neil.

 

[middleagecrisis]

Dammit, for the cost of getting a stroker kit landed here I could as well find a 360 and Magnum heads are no easy find either. Looks like I may have to rethink the stubborn desire to keep it 318.

Randomly stumbled across this whilst looking up the cam grind for the crane. Pokey!

Old School 340 Build

People are always going to bad mouth a 318 on this forum. There’s nothing wrong with a 318 that’s been properly put together. It comes down to more displacement from a 360 or 318. It sounds like the current motor met your needs, except you wanted to put a hood back on the car. If you’re happy with the way it ran before, then do as was suggested and put a Edelbrock RPM manifold on it and a 650 or 700 double pumper. You’ll go down a rabbit hole with money if you chase all the suggestions offered in this thread. Just my two cents worth. Edit: I still stand behind the above, but I see you went down the rabbit hole. I should have gone to the last page first

 

[Newbomb Turk]

Current engine/drivetrain in my valiant is as follows:

318
167 KB pistons
360 heads ported
Lopey Isky cam (exact spec unknown but it seems there’s only 2)
Solid lifters
273 rockers
HEI distributor
Tunnel ram w/dual 450 carbs
Long tube headers
4 speed
3.91 explorer rear w/locker

There may be other mods as well but these are not known to me, no idea on output but it runs healthily and pushes the car along very nicely.


It may seem mad to some but my intention is to remove the tunnel ram & 450s and replace with something I can either get under the hood or a low hood scoop.

Reading on intake choice has pickled my newbie brain - air gap, RPM, or an altogether different choice? Car is not a daily driver, weekend/sunny day fun and the odd trip down the strip.

Advice is always appreciated.

Keep the tunnel ram and sell those 450’s.

Drop two 600 CFM double pumpers on it and don’t look back.

Edit: old thread. You should have kept the tunnel ram. More power everywhere.