425->455
#2
You will end up with a 425 in a different block and heads. Depending on the heads the 455 has, you may get some better power out of it. The 425 crank is forged, and much stronger.
You can purchase custom rods and do a little work to the 455 block to make a killer stroker motor out of the 425 crank from what I understand.
John
You can purchase custom rods and do a little work to the 455 block to make a killer stroker motor out of the 425 crank from what I understand.
John
#3
As noted above, all you get is a 425 in a different block. The only reason to go through all the trouble is to get a block that uses the common 39 degree bank angle cam and 0.842" diameter lifters.
#4
Ok since I wasnt sure on this i have heard rumours. do the 455's have 2 different size lifters and bank angles?? I have from what the guy told me, a 1970 out of a olds 88.
but I was thinking of a performance motor for my starfire, and thought about the stronger factory 425 crank/rods.
but I was thinking of a performance motor for my starfire, and thought about the stronger factory 425 crank/rods.
#5
Ok since I wasnt sure on this i have heard rumours. do the 455's have 2 different size lifters and bank angles?? I have from what the guy told me, a 1970 out of a olds 88.
but I was thinking of a performance motor for my starfire, and thought about the stronger factory 425 crank/rods.
but I was thinking of a performance motor for my starfire, and thought about the stronger factory 425 crank/rods.
425s could have come with either 39 or 45 degree bank angle and either 0.842" or 0.921" lifter diameter.
A 66 Starfire 425 SHOULD have a 45 deg bank angle and 0.842" lifters, but be sure to check.
If you do plan to swap parts between the 425 and 455, be aware that despite the common bore, the pistons are different. The 425 uses 7" rods; the longer stroke of the 455 requires 6.7" rods. The pistons have a different compression height as a result.
#6
The "stroker" combo is to use a 455 crank with 425 rods and use Pontiac pistons. (I think a stock pontiac 455 piston is 0.028 thanthe stock Olds 455 bore) I think you end up around 470 cu. in. My Nephew has this combo with 0.030 pontiac 455 pistons. The rod bolts come close to hitting the cam lobes but DON"T. Great TORQUE engine. Later, Ken
#7
uhh i dont know where to put this or what to do. the forums wont let me see any new replies OR check my private messages. uhmm...anyone have any ideas?
i cant even see the new posts to this thread, even though i know there are some.
i cant even see the new posts to this thread, even though i know there are some.
#8
The "stroker" combo is to use a 455 crank with 425 rods and use Pontiac pistons. (I think a stock pontiac 455 piston is 0.028 thanthe stock Olds 455 bore) I think you end up around 470 cu. in. My Nephew has this combo with 0.030 pontiac 455 pistons. The rod bolts come close to hitting the cam lobes but DON"T. Great TORQUE engine. Later, Ken
#9
oldsguy, yes it allows me to se my post after i post again, and all new posts.
the last post i can see before posting again is
"Ok since I wasnt sure on this i have heard rumours. do the 455's have 2"
thats the last post.
the last post i can see before posting again is
"Ok since I wasnt sure on this i have heard rumours. do the 455's have 2"
thats the last post.
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