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this is what im looking for and anyone with rock solid knowledge please reply only. Thankyou.

I need: Block height deck

Conrod length

Bore Size

Stroke

Piston compression weight

Combustion chamber volume

Main journal size

Rod journal size

Oil pump drive size. ie, are they the same and what year did they change

Port volume

& last of all for now Valve sizes

Possible monsta in progress but neeed to know how much is interchangable.

Thankyou Ryan

Edited by mad032
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this is what im looking for and anyone with rock solid knowledge please reply only. Thankyou.

Conrod length = 5"98

Bore Size= 86mm

Stroke= 85mm

Piston compression weight ???? =dont understand

Combustion chamber volume= 64cc for rb25/26, 53cc for rb30

Main journal size = really cant remember off my head got it written down at work

Rod journal size = see above

Oil pump drive size. ie, are they the same and what year did they change= not the same, change in 94 for rb26, others stayed the same i believe, N1 pumps are different.

Port volume= what exactly you after

& last of all for now Valve sizes 34mm inlet, 31mm exhaust rb26

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that one is more of a curiousity question.

and yes that was my bad... head on the side.

so can anyone fill in the blanks Fitzpatric speed works didnt?

I failed to mention that i need these specs for RB20 25 26 and 30.

Also need block deck height.

Ryan

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