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Discussion Starter · #1 ·
Hi,

I'm on the verge of starting a frankenstein B5244T5 build (2.3 block, R head and crank, 143mm H-profile rods, 4T5 pistons) due to probable cracked block. I'm going to need 1st oversize B2544T5 pistons but as they're discontinued the dealer can't help. Any idea if and where these might be still available? I'm led to believe OEM/Mahle would be sufficient for my goals (most likely under 500hp) but what would the most (cost-)effective forged alternative be? Any links to where to get some? Also, if you have some used ones lying around, feel free to let me know.

As far as I understand, the pistons should be 30.5mm comp height.

Volvo part numbers:
274532 - 81mm
274534 - 1st OS 81.4mm

Thanks!
 

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9,226 Posts
Hi,

I'm on the verge of starting a frankenstein B5244T5 build (2.3 block, R head and crank, 143mm H-profile rods, 4T5 pistons) due to probable cracked block. I'm going to need 1st oversize B2544T5 pistons but as they're discontinued the dealer can't help. Any idea if and where these might be still available? I'm led to believe OEM/Mahle would be sufficient for my goals (most likely under 500hp) but what would the most (cost-)effective forged alternative be? Any links to where to get some? Also, if you have some used ones lying around, feel free to let me know.

As far as I understand, the pistons should be 30.5mm comp height.

Volvo part numbers:
274532 - 81mm
274534 - 1st OS 81.4mm

Thanks!

you will not be able to get oem pistons anywhere...if you like i have brand new oem/mahle pistons 81.5 with rings and h-beam rods for 700 shipped.
 

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Discussion Starter · #3 ·
Thanks again for the offer Dougy, but I'm pretty set on going with the longer R stroke. Looks like I'll be getting custom 81.5mm JE pistons in B5244T5 spec. Now, can anyone tell me what the 4T5 piston negative volume might be in order to get 9:1 CR? For the B5254T4 83mm piston it should be -15.2cc (CR 8.5:1) while on B5234T3 81mm piston I believe it's -10cc (CR 8.5:1)? Can't find any detailed specs for 4T5 pistons anywhere :,(
 
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