454 head choice
03-09-2010, 04:44 PM
#1
Member
MASTER JOURNEYMAN
Thread Starter
Join Date: May 2003
Posts: 35
454 head choice
i have 454 that i am rebuilding for a 72 chevelle that will be set up mostly for the street but will see the strip some. i am in the planning stages right now and while shopping for parts i came across a set of gm performance heads, part number 12363390. i was wondering if these are a good set for my project. i am planning on boring it at least .30 over maybe .60 and a compression ratio about 10.5. i am not for sure about a cam yet but due to my budget it will probably not be a roller. any suggestions here would be welcome also. i am shoting for 500+ hp. the car currently has a th400 with a 3000 stall. ford nine with two sets of gears 1) 5.00 with a spool (for the strip) 2) 3.50 posi (for the street) thanks for the help.
03-09-2010, 06:43 PM
#3
Senior Member
MASTER BUILDER
Join Date: Apr 2009
Location: B.C. Canada
Posts: 145
Originally Posted by Tod74
dON'T KNOW THAT HEAD NUMBER BUT 049 OR 781 OVAL PORTS ARE CHEAP AND WORK VERY WELL IN A HEAVY STREET CAR.LOTS OF TORQUE.Sorry about cap locks too lazy to fix.
If you have some extra cash the brodix oval port race rites :wink:
03-10-2010, 09:23 AM
#4
Senior Member
RACING JUNKIE
Join Date: Dec 2008
Location: Sugar Hill, GA
Posts: 1,365
The 12363390 is an aluminim oval port "Bow Tie Performance" series. 2.25/1.88 valves with 11/32 stem.
Dual springs, 1.514 od, 140# at 1.94, 1.20 solid height, and 368 lbs per inch (same spring used an all 502ZZ engines).
290 intake runner
110 exhaust runner
110 semi open chamber combustion chamber
Great mid range performance.
Dave
P.S. Lose the 5.00 gear, it's too much.
Dual springs, 1.514 od, 140# at 1.94, 1.20 solid height, and 368 lbs per inch (same spring used an all 502ZZ engines).
290 intake runner
110 exhaust runner
110 semi open chamber combustion chamber
Great mid range performance.
Dave
P.S. Lose the 5.00 gear, it's too much.
