Re: [Amc-list] Big valve heads on 290/304

["Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>]

Greg,
I have a friend who has a humpster Javelin that had a 304 three speed in it.
He's told me that was a great engine. he did a few mods to it many years ago
and said he routinely stomped on his competition with it.
So I'm really interested in what you are doing with the 304. The white
Javelin entrusted to my care has a 304, which I've always wanted to modify
just a little, for a little more horsepower. Mostly just fuel injection,
headers, exhaust  and cam.
Anyway, I wish I could help you with your questions on the heads, I have two
304 engines and two sets of 291C heads but I've
never seen the two in combo nor have I compared any dimensions. I do
remember some on this list, maybe Nick Alfano, talking about this subject
recently, so I know some one else has done it before too.
Good Luck with it Greg, and I'll be sitting on the edge of my seat waiting
for more information......
Armand


----- Original Message ----- 
From: "Greg Taylor" <amundaza@xxxxxxxxx>
To: "AMC-LIST" <mail@xxxxxxxxxxxx>; "FSJ-List" <FSJ-List@xxxxxxxxxxxxxxx>
Sent: Wednesday, October 15, 2008 10:52 AM
Subject: [Amc-list] Big valve heads on 290/304


Hey guys,
We’re beginning the build-up of the stroker 304 and I have some questions
about running the 1970 291C heads on the smaller bore block. I’m boring the
304 out to 3.83” (0.080” over stock size of 3.75”). I picked up a set of
race-prepped 1970 360 heads with 2.02/1.60” SBC valves installed, because
they were a good deal. The heads are about done with a new valve job,
hardened seats on the exhaust and some new valves with undercut 5/16” stems.
The heads have had a mild port/polish done to them by NAMDRA’s head guy (don
’t recall his name … he originally built the heads).

The spacing across the SBC valves measures in at 3.73” from outside of
intake to outside of exhaust valve. Does anyone know the relation of the
intake to the bore and the exhaust valve to the bore on a stock AMC? If one
is closer to the bore, which? Or if they are ‘evenly spaced’ it would leave
0.050” valve to bore clearance … IF … I run the 1970 360 heads on the 3.83”
bore block.

Performance AM Style calls for a 0.060-0.090” valve-to-bore clearance, when
running the bigger valve 1970 heads (2.02/1.625 stock) on the 290/304
blocks, and calls for notching the block for valve clearance. If this
becomes too much work for a street/offroad engine, I have a set of 1970 304
heads that I can put 1.94/1.50” SBC valves into. That would measure in at
3.63” across the valves and definitely clear the 3.83” bore 304 block.

Has anyone on the list run the big valve heads on the 290/304 or can point
me to someone who has? Herman Lewis? Atkins?

Thanks all for your feedback.

Sincerely,
Greg Taylor :) <><
Rochester Hills, MI
1989 Jeep Grand Wagoneer "TRMN8R2"

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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