307 to 403 OLDS

olds307 and 403

olds307 and 403

Comic Book Super Hero
Oct 14, 2008
4,765
113
Melville,Saskatchewan
Don't waste a dime on the stock 4A heads. Mine measured about 86cc and they have a horrible exhaust port. Some 64 to 72 Olds 330(around 64cc) to 350 heads(68 to 70cc) with 2" or 2.07" intake and 1.625" exhaust valves with the bowls opened at a minimum. Better flow and a good compression bump. This will bring your current 7.5 to 8 to 1 compression to around 9 to 1, depending on how far those pistons sit in the hole.
 
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TURNA

TURNA

Geezer
Jul 24, 2009
8,224
113
Socialist NY
Just a cruiser!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
olds307 and 403

olds307 and 403

Comic Book Super Hero
Oct 14, 2008
4,765
113
Melville,Saskatchewan
You did a 2004R conversion on this car, did you not? Make sure a good sized cooler is added. My stock 403 with a 204/214 cam like the 2400 flash stall converter. It was rated at 2000 to 2600 stall.
 
Texas82GP

Texas82GP

Comic Book Super Hero
Supporting Member
Apr 3, 2015
4,909
113
Spring, Texas
Just a cruiser!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Yet the 307 isn't enough.....
 
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TURNA

TURNA

Geezer
Jul 24, 2009
8,224
113
Socialist NY
Yep it will be Olds gold if the swap goes through.

I installed the cooler but the 200C is still in the car

I have a GN 2004r and a D5 waiting to be installed.
 

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