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Anonymous
Guest
i have a 250 straight six complete that i took out of my mustang and i would like to hop it up.. i was wondering if anyone had any advice that they could share wtih me on this . any advice would be helpful.
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Anonymous
Guest
8)
Read some back post but to some it up:
Add a bigger carb like a Carter YF 1bbl or a Holley 52002bbl or a Holley 2300 series 2bbl.
Add a header and exhaust splitter and high flow exhaust system.
Switch to a electronic Ignition to get a hotter spark
Add a good hipo cam about a 260deg duration.
Depending on how you drive you might try a underdrive alternator pulley
If engine is being rebuilt after break in switch to a quality synthetic lube. If it is not being rebuilt then I would flush the engine them switch to synthetic lubes and run a good oil filter.
Read some back post but to some it up:
Add a bigger carb like a Carter YF 1bbl or a Holley 52002bbl or a Holley 2300 series 2bbl.
Add a header and exhaust splitter and high flow exhaust system.
Switch to a electronic Ignition to get a hotter spark
Add a good hipo cam about a 260deg duration.
Depending on how you drive you might try a underdrive alternator pulley
If engine is being rebuilt after break in switch to a quality synthetic lube. If it is not being rebuilt then I would flush the engine them switch to synthetic lubes and run a good oil filter.
A
Anonymous
Guest
thanks guys for your advice.. i am sure it will be most helpfull... anything else that comes to mind pleaze share with me
A
Anonymous
Guest
thanks guys for your advice.. i am sure it will be most helpfull... anything else that comes to mind pleaze share with me
Howdy Swanson and All:
If you are rebuilding the short block, consider reducing or eliminating the massive deck clearance found in 250s. Mine had .150" of deck height. Consider using the pistons from a 255 V8 which will stand .085" taller in the bore than replacement pistons. That would leave .065" which can be reduced by decking, or milling off the top of the block. The aftermarket head gasket will leave more than enough space for valve/piston clearance.
Reducing deck clearance (deck height + compressed gasket thickness) will improve quench and increase turbulence, which will improve combustion efficiency and reduce tendency for pre-ignition.
You will have to open up the combustion chamber in the head to control Compression and keep it in the 9 to 9.5:1 range. Measure all critical dimensions carefully and record. You will also have to use hardened steel washer under the head bolts to avoid bottoming them out in their holes.
Be sure to have the whole rotating and reciprocating assemblies balanced, both static and dynamic balancing. Because of their longer stroke and poor rod to stroke ratio a 250 will have it biggest advantage at engine speed below 5,000 rpms, so choose your cam accordingly.
That's my two cents.
Adios, David
If you are rebuilding the short block, consider reducing or eliminating the massive deck clearance found in 250s. Mine had .150" of deck height. Consider using the pistons from a 255 V8 which will stand .085" taller in the bore than replacement pistons. That would leave .065" which can be reduced by decking, or milling off the top of the block. The aftermarket head gasket will leave more than enough space for valve/piston clearance.
Reducing deck clearance (deck height + compressed gasket thickness) will improve quench and increase turbulence, which will improve combustion efficiency and reduce tendency for pre-ignition.
You will have to open up the combustion chamber in the head to control Compression and keep it in the 9 to 9.5:1 range. Measure all critical dimensions carefully and record. You will also have to use hardened steel washer under the head bolts to avoid bottoming them out in their holes.
Be sure to have the whole rotating and reciprocating assemblies balanced, both static and dynamic balancing. Because of their longer stroke and poor rod to stroke ratio a 250 will have it biggest advantage at engine speed below 5,000 rpms, so choose your cam accordingly.
That's my two cents.
Adios, David
A
Anonymous
Guest
HI swanson,
The best advise at this stage is to purchase a copy of the Falcon Performance Handbook. It will answer questions you didn't know you had.
Enjoy - Steve
The best advise at this stage is to purchase a copy of the Falcon Performance Handbook. It will answer questions you didn't know you had.
Enjoy - Steve
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