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So it's mainly on the gasket surfacers that's the problem ?

Just curious I get what porosity is, but exactly does do to the head ? Leaks ? brittle ? chucks fall off ? poor surface in the ports ?

At least it's a cheap fix :)

All stock Mopar V8's already have great rod ratio's, if stroking which you said your probably not, does lower the ratio, would be worth while ($$$/hp) to correct ? probably not especially on a sub 8000 rpm engine.

All factory 2.02 heads are 340, 360 only had 1.88.

Stock 1.88 valve 360 heads are good for 350-375 hp with reasonable cam and cr, eg.. a comp xe268h and 9:1 should = about 350 hp with the rest of the combo being a match. If wanting more power especially while keeping cam mild some head work will be needed, it all depends what your after.

I Have to do the same. Seen you dig the car out, What's the 1st step to less slow ?

But I'm happy to see your still alive and kicking, hopefully everything going well for you.

Can get pretty hot & humid up here too especially July to mid September.

I thought he meant EQ's isn't 318b part of there number ?

how they do power wise ?

All depends what you want ( where you want the powerband to live) I could see a stroker with ported j heads, to me displacement is more of an rpm & gearing thing (less & higher for similar performance) than a performance mod.

My car was an original 273 car, thought about putting a turbo/blown 273 back in :)

I showed a 500 hp 307 build in this thread, same bore as a 283 and wasn't too fancy pretty much what you would do making 500 hp with any other engine and size, just had too spin it up too 7,400 rpm.

Shouldn't need to, say you squeeze 550 hp and make around 1.25 lbs-ft per cid and 90% of that torque at peak hp. 408 x 1.25 x 90% = 459 lbs-ft @ peak hp 426 x 1.25 x 90% = 479 lbs-ft @ peak hp 550 hp x 5252 / tq @ peak hp = peak hp rpm 408 = 550 hp @ 6,300 rpm and 510 lbs-ft @ 4300-5300 rpm...

Most are running a 2.02 valve or less, a 318 bore is more than capable, is it costing you a few hp, more than likely but under 500 hp I wouldn't lose any sleep over it. And if rebuilding with a .030-.060" overbore your so close to being basically 4". If people really cared about bore size they...

They can if the drivetrain is factored in, engines of similar power eg.. 300 hp, but vastly different displacements (rpm, powerbands), if each geared to take advantage of each's powerband they generally will be putting similar torque to the ground.

I had to defend my wanting a 400 hp ish 273 against all the 360/408 guy's probably why I'm defending the 273, 318's etc.. all the time. That's what I originally wanted to build was around 375-425 hp 273 at 6500-7500 rpm, for a Time Attack 65 Cuda I was trying to build, but never happened...

The easiest way if we assume similar VE% and efficiency is Just times Cid and rpm / New Cid = New cids rpm, 360 x 5500 rpm / 273 = 7,253 rpm, 318 = 6226 rpm. Or divide by desired rpm to see what cid you need. That's if VE% and efficiency is the same less efficient = more rpm, higher...

Picking on my namesake :(

100% plus the 318 guy's aren't anti 360 or 408 or whatever (maybe 2 are :) ) and trying to get people to build a 318 instead were just more openminded, if what the OP wants can be accomplished with a 318 or whatever engine and he is fine with any negative side effects then we try help him out to...

Same, you hear a guy doing 11/12's in a /6, 273, 318 and your ears perk up. That's a cool little car. I like the 318willrun's type builds what can you get out of it doing minor mods especially to mostly stock parts.

Yes apparently so, how do we know cause these magazine guy's tried to misinform to make us believe it's possible cause obviously the illuminati wants us to build 318 over 360 :) 3-8-Teen Dream Chrysler 318 Engine - A Powerplant To Brag About

That's why post it so often, on these types of threads, Should easily help any one wanting to do anything under 400 hp. With a 360 or even a 318/340 shouldn't be too different. Add some CR and or a set of Edelbrock or clone heads for even better results. Here similar on magnum side, the cam one...

And the 318 guy's are also in here, notice were not trying to convince the OP to build something else that he don't want to/interested in :}

Problem with magnum heads there prone to cracks, so not really worth putting much money into, They seem to make a little more power than 360 heads but any aluminum aftermarket gonna make more than both.

This video shows what basic hop ups will do.

I'd say it's probably in the tune or something, guessing you upgraded valve springs. Power shouldn't drop sharply off at 5100 rpms.

I'd say it would probably peak there but shouldn't be done especially with ported heads (depending on porting) cid cam and heads main ingredients for powerband, intake exhaust can tune for stronger and narrower or broader and longer rpm range.

Here you go a roller in a stock 5.9l headers and 4 bbl :) What's wrong with graph's ? pic is supposedly worth a 1000 words :)