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

[Greg Taylor <amundaza@xxxxxxxxx>]

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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