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Old 05-23-2006, 12:02 AM
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rais compression without pistons "howto".need some tech advise

zero deck or take .020 off the head or both to go from 8.3 to at the most 9.0.maybe it`s impossible to do but it`d be nice.

58 cc heads , 3.53 bore 3.48 stroke..
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Old 05-23-2006, 07:15 AM
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Yes decking the block will raise compression but not by much with stocker pistons and stocker heads. Besides the point, you could raise the compression ratio to 13:1 and it still wouldn`t do any good, why? because flow is power, everything else falls into place afterwards by compression, cam, heads, intake, exhaust, timing, and etc. The 267 can`t flow enough air to make any real power, it wasn`t meant to make power to start with, it was meant as I already said before to meet emissions standards. If you look at the stock intake on a 267 you`ll notice the intake runners are very small and why is because it has to be able to have high velocity in order to make enough torque to move the vehicle, the vehicles weight as well as high rear gear ratio`s strain the engine bad enough as it is, if you put a edelbrock performer intake on it, it would kill low end power due to the intake runner size is considerably bigger than the stock intake is. As also already been said, you can`t flog a dead horse. If you were to put a supercharger on this engine it still wouldn`t help it much, the heads can`t flow enough air to make power, and the tiny tecumseh engine sized bore just chokes it to death all the more since it`s not big enough to flow air either, it also limits you to a small valve to clear the bores, which also hampers air flow. I know you didn`t ask for this long a answer, but I`m only doing this to point out you can`t flog a dead horse no matter what you do to it.
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Old 05-23-2006, 09:48 AM
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i know i know.

but all i have other than the 267 is a 250 inline six that has helascious torque maybe i should just get a clifford rebuild kit for the inline six. only problem is the block looks like a carton of eggs. the guy that had it before run it without an air cleaner. so yah i`m prolly screwed all the way around.but even if i can get a set of pistons in it. intake manifold 4brrl,headers dual outlet. increase valve size to improve ""flow" which is performance as u mentioned. well in between the two which would u choose, slightly improved 267 or all out 250 inline six?? seeing as how i`ve already driven the truck with the six and i know what kind of off the line torque it has stock a turbo eclipse can`t keep up until i get to 3rd. there ai`nt no horsepower ,with the out of round pistons.
if i choose to modify any which one of these motors how should i prep it, and what is the best combination to go with? clifford or use dd2000 and mess around until it seems right?


but for the 267 for a daily driver with a granny low sm.465 tranny .31 inch tires. think it`d do a lil better than the six or would it be about the same.
which is my best bet to get the most street performance out of. ?? and which one you think would get to 70mph first??
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Old 05-23-2006, 10:06 AM
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Milling the heads as mentioned

hmm what else...

Valves that are not dished

Thinner head gaskets.

Kill a few birds with one stone, Offset grind the crank(stroke it), this could not only raise the piston but increases the compression ratio at the same time.
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Old 05-24-2006, 08:03 PM
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250 inlines are making a comeback...
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Old 05-25-2006, 06:10 AM
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Quote:
Originally Posted by 74chevyflat
which is my best bet to get the most street performance out of. ?? and which one you think would get to 70mph first??
Done right, I would put my money on the in-line 6.
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Old 05-26-2006, 09:21 AM
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i likey

Quote:
Originally Posted by jray
Done right, I would put my money on the in-line 6.
i like the off the lin torque the l6 has ,i ran a gear grinder in my truck and it took off nice and went through all the gears got it up to 80+ and the aluminum bellhousing blew all to peices, never seen an aluminum bellhousing before. i wonder what it came out of. with the right components i can get about 230hp and over 350ftlbs of torque with the six. i think i`ll stick about 400 bucks in the 267 just to rebuild it,and put a small cam in it and an intake. and see how it runs. "contemplating on how to build the six though.clifford components or does someone know some tricks??feel free to post info.
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