Re: [Amc-list] V8 Cylinder Head Questions

[Greg Taylor <amundaza@xxxxxxxxx>]

Hi Mark,
  Thanks for the feedback, this is exactly what Rick Jones was discussing ... smaller valves = more torque.
   
  The big question is what size CC chambers the 1989 360 heads have ... of course, they might not be 1989 heads, since it is a remanned engine.  Perhaps I'll have to pull the valve covers and get the casting numbers to compare.
   
  I ported the heads along the lines of the Performance AM Style publication, but did not fully open them up to match the gaskets.  Just cleaned up the runners and ground down & smoothed up the valve guide bosses.
   
  Thanks,
  Greg Taylor :)  

Wrambler242@xxxxxxxxxxx wrote:
  I'd stay with the smallest vales that will get the job done if your looking for torque.
In a Jeep that size you may well want to leave the valve sizes alone in those 304 heads.
specially since they are small stemmed.
My brother put a set of takeoff 80's 5,0L heads on a fresh 030" over 351 windsor in a 1980 Mustang.
It was a tire frying monster up to about 4,000rpm, then it dropped off quick. In your Jeep, that is likely exactly what you are looking for! Mind you his car was no slouch going on up to about 5500rpm, but it did not have the as much power up high as larger vales would have given it.
A lot will depend on exactly how those heads have been ported.

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5
2004 Grand Cherokee Laredo, 4.7L, Quadratrc II
" Chronic Pain Hurts"

-------------- Original message ----------------------
From: Greg Taylor 
> Hi all,
> I am doing some work on my 1989 Grand Wagoneer engine and am considering 
> swapping heads while I am at it. I need some feedback from the experts, please!
> 
> My Jeep has a stock remanned 360, which is probably 0.020 or 0.030 overbore. 
> Reman company is unknown, but it has about 60,000 miles on the reman (10 years 
> old). I'm pulling the front timing cover to fix a coolant leak behind the fuel 
> pump. I'll be installing a new Bull Tear front cover and nickel plated pump 
> cover, double roller timing set, GM HEI, & a hi-flow water pump for this build 
> up.
> 
> I am also considering pulling the intake and heads while I'm at it and 
> installing some 'built' heads. I have the '79 304 (59 cc) heads I was building 
> up for the 304 stroker turbo motor. I have ported and polished them and they 
> are currently machined for CHEVY Milodon Megaflow 1.94 Int & 1.50 Exh. valves (I 
> know, they're smaller than stock 360). I am considering having them machined 
> for larger Chevy valves, as Milodon makes much larger Megaflow valves.
> 
> How much larger can I go on a 360, with intake and exhaust valve size?
> 
> The 304 heads had had the combustion chambers opened up as detailed in 
> Performance American style, so they are probably about 61-62 cc's in size now. 
> How much would this drop the stock 360's 8.4:1 compression? If it would drop 
> too much, how much can I mill off the AMC heads, to bring compression back up? 
> IF I could machine 0.100" off the heads, there are 0.100" longer Chevy valves 
> that would make up the difference in valve height so that "theoretically" the 
> pushrod length would not be affected.
> 
> Lastly, my 304 heads have been machined for 3/8" studs for the Harland Sharp 
> roller rockers I plan to install.
> 
> Thanks for the feedback, all.
> 
> 
> Sincerely,
> Greg Taylor :) <><
> 
> And the testimony is this, that God has given us eternal life, and this life is 
> in His Son. He who has the Son has the life; he who does not have the Son of God 
> does not have the life. - 1 John 5:11-12
> 
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