Correct spark plug heat range for 383 with Aluminum heads?
I have been searching CF and internet to find out the correct spark plug heat range for my engine, but not having much luck.
My engine is 383ci with 10:1CR and aluminium heads and almost stock HEI with upgraded high voltage chip.http://www.ecklerscorvette.com/corve...1975-1980.html I have bought these spark plugs but am not sure if the heat range 4 is little too hot? http://www.ngk.com/more_info.asp?AAIA=&pid=2656 NGK heat range goes from 10(cold) to 1 (hot) What heat range would you recommend for the initial starting point? I would like to stay with NGK product as it is easily accessible in the UK |
I have been using NGK UR4 plugs in my 383 in my 61 for many years. Runs great. It is 10.25:1 compression, 202/160 iron heads.
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The same heat range used before the change
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I have been using the same spark plug for years with aluminum heads that is NGK V-Power BKR6E it is medium cold and I never had a problem with them on a 550HP and now 600HP small block, they are 3 bucks each :thumbs:
V-Power Resistor Spark Plug 14mm x 3/4" Reach 5/8" Hex ISO projected Gasket seat http://www.ngk.com/results_cross.asp...on.y=12&mfid=1 |
On my previous 383 with AFR 195 heads, and also with Trick Flows, I used AC Delco FR3LS's which were recommended by both companies. The current number for these is AC #41-629. These worked out perfectly for me.
For NGK and other brands, cross refence with this link: http://www.sparkplug-crossreference....DELCO/FR3LS%20 |
Originally Posted by C3 Stroker
(Post 1581550240)
On my previous 383 with AFR 195 heads, and also with Trick Flows, I used AC Delco FR3LS's which were recommended by both companies. The current number for these is AC #41-629. These worked out perfectly for me.
For NGK and other brands, cross refence with this link: http://www.sparkplug-crossreference....DELCO/FR3LS%20 "A cheaper alternative are NGK BKR6E plugs, but they won't last as long." So maybe you will only get 50,000 miles on them :lol: |
Originally Posted by capevettes
(Post 1581542076)
I have been using NGK UR4 plugs in my 383 in my 61 for many years. Runs great. It is 10.25:1 compression, 202/160 iron heads.
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