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Stock 26 Head Vs Modified 25

WHITER33GTS-T
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blue_vl_t Rising Star

blue_vl_t

Posted
Posted

Rob what was changed though?

as really the rb25 head ports are the same as rb26, so i'd say your extra power was made from cam selection/solid lifters, head modification, intake plenum and the fact you are running 2psi extra boost. All which could be done to the rb25 head if someone was keen.

correct me if im wrong :thumbsup:

WHITER33GTS-T Veteran

WHITER33GTS-T

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The 26 head was ported, oversize valves, 280 10.8mm cams, stock inlet, 6Boost manifold, Garrett T51r

The 25 head was ported, tomei 256in and 264ex cams, Greddy plenum, 80mm throttlebody, 6Boost manifold, Garrett T51r

blue_vl_t Rising Star

blue_vl_t

Posted
Posted

Fair few differences, must have quite an idle with 280 cams :O

Who ported the head for you?? do you know what was done, was it ported for drag racing, outright power or mild post, smaller ports etc for all round performance? you running 1mm oversize on the intake and exhaust?

Do you have this going at the moment rob? or still having problems/rebuilding/upgrading :D

WHITER33GTS-T Veteran

WHITER33GTS-T

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Proengines built the head after I was screwed over by a local mechanic (you know who)

Am running oversize on intake and exhaust. There was a flow chart posted on here somewhere of my head.

The engine has been in the car since August but just had to pull the sump off as it didnt seal. The goal is to have it running for powercruise next year.

We will fire it up on 98 and make sure everything is all good then will drop in the 2000s and get into the E85 :thumbsup:

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