The swirl port heads are better than non-swirl port heads. I can't explain why however, someone else will have to do that. Problem is, finding a set that aren't cracked. They only used them for a few years, not sure which there either but it was something like 85-88.
well i have a set of 83 heads, on my 360 block, and i didnt put oversized valves in them, and im wondering about how good they will flow, cause i have heard that 318 heads flow bad...
but do swirl port heads flow bad cause i was reading on another site and another guy sayed that they flow terible....
i know i will have more low end torque but ive nervus about highway speeds....
The '302 heads flow about the same as any 318 head except maybe better on the exhaust side. 318's use 1.78/1.50 valves and 360's use 1.88/1.60 valves. Shouldn't put 318 heads on a 360 or it will make it very weak on the upper ends of the RPM range.
The '302 heads flow about the same as any 318 head except maybe better on the exhaust side. 318's use 1.78/1.50 valves and 360's use 1.88/1.60 valves. Shouldn't put 318 heads on a 360 or it will make it very weak on the upper ends of the RPM range.
If you port the 302s install the 1.88/1.60 valves you can have a combo for a 318 or a 360
most iron 360 heads have a 67-70cc head. putin ported 302 heads on a 360 can increase
the the compression of the motor all good. A stock set of 302 heads is not going to do
a whole bunch
While on the subject of porting heads, how much hp/tq/milage is a good port job and valve resize good for... well, it will vary but roughly? To set some variables, lets say on a stock engine, just reworking the heads, no other modifications.
Thats a tough one to answer because there are other variables such as intake, carb and exhaust that could be really restrictive. If they are then porting wont' do much. Porting the area behind the valves will give the most gains ( bowl porting). Gasket matching will give the least gains. Opening the pushrod area helps too. Bigger valves help power across the entire RPM range. If you do port read steve dulcich porting articles on mopar muscle magazines website.
ok so i got it but thats only a difference of .1 on both intake and exhaust valve's...
also if you say they (302 heads) flow a lil better on the exhaust side, then that would help it, cause im not like most teenagers who beat the hell out of everything they drive, i prefer to take it easy so it will last longer...
but in 3rd gear wouldn't 65 mph, be about 2600 rpm??
whats the difference of the CC's in the combustion chamber for the 302 heads, and 318, and 360 heads??
less cc adds in compression of the motor. Most 360s of the 80s were 8-1 to 8.5-1 motors with
a large cc combustion chamber of the heads. The 302 318 head has a 57 cc head much smaller
puttin 57 cc head on a 80s 360 can rasie the compression around 9-1. Mopar muscle a few years
ago found some power out of them
You say that like it's no big deal, but .1 is an 11% increase of surface area on the intake side. That doesn't mean flow, but the potential is there with bowl work.
Good thing there is some info in our lovely but neglected FAQ section:
Joe i have already read those posts on the site, when i was 'exploring the site', but Thanks Again, and thanks to everyone else who has helped me....
the engine is already build, so i should just drive it the way is, but for a 4x4 stand point, its useless
but it the future (when i have the money and Obama will maybe ACCUALLY do something about the economy) i shall build a better engine, and im going to an Automotive Class at a trade school next year in school, maybe it will teach me something i dont already know
Kenneth, did you just build up a 360 with 318 heads? Strongly consider putting a set of 360 heads on there. There will be a huge difference in performance. It would take a lot to get 318 heads to match 360 heads in flow. its not just valve size its port size too.
Swaping out your heads is not that hard and does not requre pulling the engine. Remove some of the accesories on the front of the engine, like A/C, Alternator, and perhaps Smog pump. Then you remove the intake manifold, then the valve covers, and then the heads. Well, pretty much thats all there is to it. But Leave the block bolted in the vehicle.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Dodge RamCharger Central
1.3M posts
72.2K members
Since 2002
RamchargerCentral.Com is a Dodge truck community built by a vast number of experienced owners. Whatever you're thinking about doing from routine maintenance to full-on restoration, odds are somebody around here already has. Originally focused on the Ram Charger / Trail Duster, our members own, drive and wrench on Mopars from the 40s to the current day. It's not what you buy, it's what you build.