Re: [Amc-list] Re; 327 Ramblings (Also I-6?)

[Wrambler242@xxxxxxxxxxx]

Thanks, John, any and all comments are wlecome on this.
Valve stem specs on the 327 show at .3407-.3412. On Evilebay there are Elgin manufactured valves with a stem size of .3415, undercut stem in the port area, swirl polished, stainless for about $80 for a full set of 194 and 160 or 194 and 150". Length is 4.905 compared to the Ramblers 4.892 and 4.899. The only variable I see is tip length and no mention is mad eof the 327's, Chevy valves carry a .250 tip length, Sounds pretty standard.
  I hope to delve into it deeper soon.

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5

 -------------- Original message ----------------------
From: "John Elle" <johnelle@xxxxxxxxx>
> 
> 
> 
>  SNIP
> Isn't there a 1.55" chevy valve? Exhaust? Wouldnt' that fit
> intake better?
> Snip
>  
> Seems to me that a few of the advantages to go with Chebby 
> valves on the later V-8s might and I re-emphasize might 
> cause I have not taken the time to look it up but would have
> to or could if someone was interested is that the Chebby 
> valves are the right length so that they will fit into the
> same space in the head/valve train components that the AMC
> valve does. However there are two things that make them 
> better and one is that the are a bit smaller in diameter. 
> This requires that a valve guide be sleeved to neck it down 
> so it can be used. This is not unknown in head rebuilding 
> circles so not a problem. However internal to the port the
> there is more room 'cause the valve stem is smaller so you
> have in creased port size with out any further machine work
> and also the valve is lighter making high rpm work more 
> efficient. Of course this does raise the question of how 
> tight you are going to twist an AMC 327 or so V8 or an I-6
> so that might just be a bit moot. 
> The second reason is the later V8's valve seat is ground 
> at a shallower angle than the Chebby valve seat. Later 
> V8's do not use a hardened valve seat, but the head is 
> induction hardened not needing a hardened valve seat so 
> when you regrind the valve seat to a Chebby size. The hole 
> in the head will be larger because you are steepening the 
> valve sea angle when you use a larger Chebby valve just 
> because you are regrinding the seat to Chebby specs.
> Thus you have better breathing due to the use of a 
> larger valve.
> However this advantage only becomes an advantage when
> you are twisting the AMC327 or AMC I-6 tighter so if
> you are not twisting it tighter I guess you can ask
> yourself whether these are advantages after all! 
> The logical next question would be does the early V8 use
> an induction hardened head and also does the I-6 in any 
> of it's permutations?
> Smoke stated in his engine building dissertations that an 
> engine is an air pump. The amount of air you can get it 
> to pump is an indication of the amount of horse power it 
> will develop. 
> Thus there are two ways of getting your engine to pump 
> more air. Build it bigger or twist it tighter. Both 
> solutions may require a bit of a budget to accomplish
> and on the street there is only so much rpm that is 
> useful, the rest is over kill. 
> My own experience building a street I6 is with using 
> an AMC-258 with a stock head and an Iskenderian cam. 
> It will do 75mph in passing gear and shift hard to 
> high. It is not as hot as the 225 Slant 6 I once built
> but this one will pass smog with out any adjustments, the 
> slant 6 did not have too. In addition I am running a bit 
> over 9:1 Compression which is compatible with 91 Octane 
> high test. The Slant 6 needed 101 Octane to be happy and
> it was available at the time and used 13:1 compression. 
> John. 
>  
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: 
> http://www.amc-list.com/pipermail/amc-list/attachments/20070425/5e2a4c4e/attachm
> ent.htm 
> _______________________________________________
> Amc-list mailing list
> Amc-list@xxxxxxxxxxxx
> http://www.amc-list.com/mailman/listinfo/amc-list

_______________________________________________
Amc-list mailing list
Amc-list@xxxxxxxxxxxx
http://www.amc-list.com/mailman/listinfo/amc-list