Hi guys i'm new here. Everyone has probably been asked this question before but how far can a 250 be bored out. I have a couple, one is standard and the other is .30" over. I dont wish to use the standard bore one just yet as it is a matching number engine to my TE S-pack which has currently got a clevo in it. Cheers for any help.
250 Overbore?
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Boring for performance or just a rebuild? 40 thou if you plan to thrash it, otherwise probably 60 over. Most failures that occur, seem to have other mitigating factors (lack of oil pump drive shaft, for example).
Look for someone with a torque plate, hone each piston to its unique bore, and run a thermostat. That will help control wear/risk.
Cheers, Adam.
Look for someone with a torque plate, hone each piston to its unique bore, and run a thermostat. That will help control wear/risk.
Cheers, Adam.
Cheers adam. 40 thou may do my engine i reckon. I'm planning to build an offset stroker and add nitrous. My standard bore engine i'm thinking of rebuilding to accept a turbo and EFI and put back in my S-pack. The 351 is soon to make way for a 383 stroker but i'm thinking of putting that into a falcon maybe. To many projects at once can really confuse a bloke. My main aim at the mo is the 383 but i want to start gathering what i need for the stroker 6.
cheers again.
cheers again.
A
Anonymous
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G'day all, heres a little food for thought.
I have taken a 250 X-Flow to 120 thou overstandard. That is from a 3.680 bore to a 3.800 bore. This was done with out sleeving the block. You WILL need a good block though, as the cylinder walls are getting quite thin at this stage (i.e. approx. 120 thou by my thickness tester). We did grout the bottom of the cylinders, as a just in case measure. Interestingly though, I never had any problems with overheating with this motor, which did plenty of varied driving, from peak hour traffic in the middle of Brisbane, to looong stretches of 100 mph+ in outback QLD. If anything, the motor tended to run a smidgen cooler than the previous standard bore motor. This was all in a TE cortina with a standard copper radiator.
I have taken a 250 X-Flow to 120 thou overstandard. That is from a 3.680 bore to a 3.800 bore. This was done with out sleeving the block. You WILL need a good block though, as the cylinder walls are getting quite thin at this stage (i.e. approx. 120 thou by my thickness tester). We did grout the bottom of the cylinders, as a just in case measure. Interestingly though, I never had any problems with overheating with this motor, which did plenty of varied driving, from peak hour traffic in the middle of Brisbane, to looong stretches of 100 mph+ in outback QLD. If anything, the motor tended to run a smidgen cooler than the previous standard bore motor. This was all in a TE cortina with a standard copper radiator.
