Re: [Amc-list] V8 Cylinder Head Questions - 2nd Follow up ( read this one )

[Greg Taylor <amundaza@xxxxxxxxx>]

Hey Spro,
  I'm not necessarily looking to increase compression .. just didn't want to install my ported 304 heads and have the 360's compression drop from 8.25:1 to like 7.5:1.  I was considering the 52-cc 304 heads as another option to 51-cc 360 heads, as the 360/390/401 high-comp heads are pricey.
   
  I'll email you offlist with Rick's information.  thanks.
   
  Greg :)  <><

msproviero@xxxxxxxxxxx wrote:
  Greg-

If you want the additional compression for the 360, I think I would pick up a set of 291's that are the 52cc chamber size and already have the appropriate valve size for the 360 instead of trying to make 304 heads work with additional mods. I have a set I bought off the list some time ago (from Joe I think?), but its my only set at the moment. I do have a couple people over on my side of the Detroit Metro area I can ask, though. If I can find a set of the 291's for you, I would be interested in trading for a set of the 52cc 304 heads.

I'd also be interested in talking to Rick if you want to email me offlist or send me a PM on GL. I have a 1970 390 that has had some crank repair done and is ready to go back together. I'd rather have someone experienced handle it due to the nature of what it is. It got beat up the first time due to the PO using the wrong flywheel.

-Spro

-------------- Original message -------------- 
From: Greg Taylor 

> How much would compression be raised if the 52 CC 70-71 304 heads were 
> installed? Just curious. Stock 360 is 58 CC through 1984, from what I can find. 
> 
> Last night I spoke with long time AMC club member (here in MI), Rick Jones, who 
> built the 401 for my ?78 Cherokee Chief. He was telling me that he recalls that 
> the later heads (like on my 1989 GW) were around 65 cc?s. Can anyone confirm 
> this or have casting numbers available (my heads are still on the engine)? From 
> the information I found online, the 360?s were 8.4:1 compression 1971(late)-1984 
> (58 cc heads). However, my 1989 GW has 8.25:1 compression. If this is due to the 
> 65 cc heads (and probably piston combo), then I might be OK in swapping the 
> ported/polished 62-cc 1979 304 heads I have modified. This would raise the 
> 8.25:1 compression a bit (3 cc smaller heads). What do you all think? I would 
> also be able to swap the 1970 304 52-cc heads as well, and raise compression up 
> a lot (13 cc smaller heads). 
> 
> Rick also told me that he has these 1970 304 heads on a 304 he built for torque 
> and gas mileage. The engine turned out to be a real screamer with a small carter 
> carb and the same intake I am running (see below). He?s getting 22+ MPG in his 
> Javelin with it mated to an AX4 Jeep 2WD tranny. 
> 
> Thanks for the feedback, all. 
> 
> Greg :) 
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