66 olds 425 98 - ClassicOldsmobile.com

66 olds 425 98

Old August 28th, 2017, 02:19 PM
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66 olds 425 98

Have original super rocket but want more horsepower....have new block and crank but want to give it more horsepower....what is best stroker package? Had bored 30 over do I need more for nitrous....know I will need better stall....thanks for insight
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Old August 28th, 2017, 07:43 PM
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Originally Posted by [email protected] View Post
Have original super rocket but want more horsepower....have new block and crank but want to give it more horsepower....what is best stroker package? Had bored 30 over do I need more for nitrous....know I will need better stall....thanks for insight

How much more hp? Budget? Some specifics would help.
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Old August 29th, 2017, 06:34 AM
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Like to keep under 5k and a reasonable hp increase for cost
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Old August 29th, 2017, 07:24 AM
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So the block is empty right now? If so I would stroke it and use chevy bb rod journal size. New rods and forged pistons. Mark cutlassefi thinks modern ring pack is the way to go. He has made several pistons brands recommendations to other guys he might chime in with one for you. Get a good aluminum intake. What level hp are you looking for and do you still want this streetable?
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Old August 29th, 2017, 08:44 AM
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Is your car your building this engine a 1966 Oldsmobile 98? If so you should upgrade your rear differential gear ratio first. Some 1966 had the "Pontiac" rearend and if so (you'll need to make sure) Monza who monitors this site has a 3:55 ratio for this rearend. There is no sense building a "stroker" engine until you improve your gears. I'd start with the rearend then move forward. A 455 will give you over 500 '#s of torque which in my opinion is the cheapest way to go, build for torque. What is your goal for this car.
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Old August 29th, 2017, 10:26 AM
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Yes I want it streetable and a 425 olds block wit 39 degree cab and will upgrade rearmed gears
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Old August 29th, 2017, 01:28 PM
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It's not to easy to upgrade the rearend depending on your carrier. I've never found a 1966 88/98 B headed D block 425 that was a 39 degree cam lifter angle. All my 1967 C headed D block 425 have all been 39 degree. If you have the Toronado 1966 425 big valved B heads D block it is a 39 degree block. Torque is your friend when trying to get one of these "battleship" moving. I suggest starting with a 455. Jmo.
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Old August 29th, 2017, 01:29 PM
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Don't worry too much about having a 39*cba. You can get cams for the 45* as well. I offer them too.
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