4.9 liter stroker kit???
Has anybody heard of a stroker kit using a crank out of a 258 ci jeep?
4.9 liter stroker kit???
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A 258 has a 3.90 stroke, so your "stroker 300" would end up a 294. I didn't check the journal size or the length, but I think it would be a complete mismatch, even if you could get past that small shorter stroke detail.....
http://www.jeeptech.com/engine/amc258.html
http://www.jeeptech.com/engine/amc258.html
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Joined: Jul 2009
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From: Sheffield, AL
FarmeRick,
Welcome to the forum!
Perhaps your question is based on something you have heard from the "Jeep" crowd. I recently read something about a 258 [4.2L] crank being used in the more modern 4.0L block to gain ~1/2" stroke. The article claimed a result of 4.7L in displacement.
Welcome to the forum!
Perhaps your question is based on something you have heard from the "Jeep" crowd. I recently read something about a 258 [4.2L] crank being used in the more modern 4.0L block to gain ~1/2" stroke. The article claimed a result of 4.7L in displacement.
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Joined: May 2007
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From: Sparks, NV
3.98" thank you! lol. if your really hellbent on stroking a 300 (why) clifford used to make a stroker kit, i dunno if they still do. one thing that is less costly than stroking a 300; improve head flow. if a properly p&p 240 head can net you about 25+ hp, what do you think lets say, a bunch of chopped LS1 heads tig welded together? huge flow to match a huge stroke. the ls1 is 5.7 liters and the 300 is 4.9. with similar head flow, you can now improve stroke. get it? got it? good.
the alumium head from classic inlines is gonna be kick ***!
also, if you look at a cam profile for a 300 and the same profile for a 302, the 4.9 profile is a slightly lower rpm than for a 302, the head dont flow! lol
the alumium head from classic inlines is gonna be kick ***!
also, if you look at a cam profile for a 300 and the same profile for a 302, the 4.9 profile is a slightly lower rpm than for a 302, the head dont flow! lol
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New User
Joined: Nov 2007
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From: Missouri
I really do appreciate all of the information I received on my question. I guess I'll swap cam & lifters, install headers and possibly upgrade the efi throttlebody and eprom chip.
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Elder User
Joined: May 2007
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From: Sparks, NV
make sure its an efi friendly cam, and i dunno about the headers, the efi manifolds flow pretty good themselves, might be a $160 headache avoided
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From: raymond alberta
3.98" thank you! lol. if your really hellbent on stroking a 300 (why) clifford used to make a stroker kit, i dunno if they still do. one thing that is less costly than stroking a 300; improve head flow. if a properly p&p 240 head can net you about 25+ hp, what do you think lets say, a bunch of chopped LS1 heads tig welded together? huge flow to match a huge stroke. the ls1 is 5.7 liters and the 300 is 4.9. with similar head flow, you can now improve stroke. get it? got it? good.
the alumium head from classic inlines is gonna be kick ***!
also, if you look at a cam profile for a 300 and the same profile for a 302, the 4.9 profile is a slightly lower rpm than for a 302, the head dont flow! lol
the alumium head from classic inlines is gonna be kick ***!
also, if you look at a cam profile for a 300 and the same profile for a 302, the 4.9 profile is a slightly lower rpm than for a 302, the head dont flow! lol
do not try to use a 240 head on a 300 EFI... from what i have seen that doesnt work so well
you gotta be pretty good with fab work to take two v8 ls1 heads and cut/weld them up to make 1 inline 6 head though... but it would make incredible improvement if you do it right...but a good P&P of the existing head will make the biggest bang for you buck on these things... while your in there do a 30* back-cut on all the valves to help them flow a bit better
these EFI 300s are not at all friendly to mods...even a slighlty agressive cam can **** on the stock ECU...the pre 95 trucks with Speed Density (SD) will only accept about 172 hp of about 17% gain over stock, considering it alreading around 150 hp there isnt much you can safely do to it without upgrading the ECU....that being said, if yours happens to be a 96 with the Mass Air Flow (MAF) setup you can get a fair bit more out of your engine without touching the ECU...
Postmaster
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From: raymond alberta
its been done many, many, many times ... 300s have also been super chagerd...a turbo works better though, and its been done more with some pretty incredible results to back it up... id like to do this one day just for ****s
Elder User
Joined: Sep 2005
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From: Brumley, MO
I think what Bill means is a kit you can buy already set up and ready to bolt on to the 300 EFI, or carb, instead of getting a Chevy 6.5 turbo and trying to fab it all up yourself. Also I think you can buy the LS1 mod heads from a guy at Fordsix.com, but there is a lot more work involved because you have to figure out how to feed it and make it poop(custom intake, and exhuast).
Elder User
Joined: Sep 2005
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From: Brumley, MO
Wow I din't know that you could get 25+ hp from a ported 240 head, thats probably a pretty cost efficient hp upgrade. If you consider each hp is like $10(they have said that for some time so it's probably $15-$25 per 1 hp now with inflation and all), thats not a bad upgrade.
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not ls1!!
yeah thats true...im not sure if it was the LS1 but i know this has been done, taking 2 v8 heads and making 1 inline 6 head, i do not know how well it worked though
its been done many, many, many times ... 300s have also been super chagerd...a turbo works better though, and its been done more with some pretty incredible results to back it up... id like to do this one day just for ****s
its been done many, many, many times ... 300s have also been super chagerd...a turbo works better though, and its been done more with some pretty incredible results to back it up... id like to do this one day just for ****s