"308" swirl port heads

[cjd1963]

Hey to everyone! Does anybody know if the "308" heads came with only 1.88 int. 1.60 exh. valves or did they also come with 1.78 int. 1.50 exh. valves as well? I have a pair with the larger valves, just want to know if 308 heads also came with the smaller valves. Thanks, Craig

 

[NoCar340]

They only came with the 1.78"/1.50" valves. Contrary to popular belief, 308s are not swirl port.

EDIT: My bad. The 302 heads only came with 1.78"/1.50" valves, and are commonly mistaken as "swirl port" heads. The 308 heads are all 1.88"/1.60" valves. Not only are they not "swirl port", this is the first reference I've ever seen or heard to them being such. The 308s are the late 318/360 truck heads.

Chrysler never made a swirl port head for the LA engine.

 

[bremereric]

I beg to differ. Just google it.

http://www.mopar1.us/dyno.html

 

[cjd1963]

Well, all I wanted to know was the valve size. Thanks for the input and hope I didn't start a heated debate.

 

[Locomotion]

There is nothing to debate. - OEM 1.88"/1.60" only.
IHRA has them listed as legal replacement for some 318 engine combos, but I believe some 318's may have used 360 heads, or they still have to have the smaller valves. I haven't researched that because I'm working on a 360 combo. But it's a weird situation that should be clarified by NHRA tech.....if you can get a reply.

 

[cjd1963]

Thanks Myron

 

[bremereric]

I run the 360 308 heads on my Aspen with no problems and they don't have the tiny valves.

 

[NoCar340]

I beg to differ. Just google it.

http://www.mopar1.us/dyno.html

A majority of people being wrong does not make them right. Chrysler does not, and never did, say they had a swirl port head for the LA. Ever.

 

[My imp]

1969 Andy Granitelli ran them on the STP Special @ the Indianapolis 500.

 

[brotherGood]

Ive always heard the 302's were swirl port..unless Im getting it mixed up with closed vs open chamber. the 360's were open chamber dogs, and the 302's were better from what I've heard.

I skipped that mess and went to magnums. Considering how little I've gotten to drive it, Im happy with my decision.

 

[8d5 AHB]

Swirl-port and fast-burn are two descriptions I've heard interchanged on both the 302 and 308 heads. Right or wrong, they are commonly referred to in that manner
http://www.mopar1.us/dyno.html

 

[8d5 AHB]

http://www.forabodiesonly.com/mopar/archive/index.php/t-60004.html

http://www.forabodiesonly.com/mopar/showthread.php?p=660528

http://www.moparmusclemagazine.com/techarticles/engine/mopp_0607_mopar_cylinder_head/chrysler.html

 

[8d5 AHB]

http://www.shadydellspeedshop.com/302.htm

http://ramchargercentral.com/vehicle-help/specs-for-the-302-swirl-port-heads/

http://www.allpar.com/forums/topic/42051-comp-ratio-of-318-with-302-heads/

Not being a D, just showing why these two castings are called "Swirl ports/fast-burn," heads. Even seen E-berg call them that years ago in an article and give a bit of history on the development (starting in the '60's at Chryco) and how they were developed in the '80's more for emissions than performance. Even mentioned the 'heart-shaped combustion chamber' characteristics

 

[cjd1963]

Thanks 8d5AHB. You have enlightened me with lots of good info about these heads. I appreciate your effort, Craig.

 

[76volareman]

heres a set of 308 cast heads i cut as much of the pushrod pinch out of. Also have a set of 2.02. 1.60 valves for them.. was going to Build these. Went aftermarket though.