what size valves

low55 Seriously Crusin Dubber

173 posts · joined Aug 2003 · 16 Aug 2004, 8:22 pm

#218986

hi all the next stage of my rebuild is the heads hers the list
of what ive got so far
as 41 cases
balanced alloy degree wheel
balanced lightend fly wheel
balanced crank and rods
balanced 85.5 pistons and barrels
009 dizzy
cam 392 degree 400 tho of lift
cases savers
and ive got a set of near new 040 heads
so my question is what valve size and comp
any help would be grate thanks
travis

[Edited on 16-8-2004 by low55]

i thirt of some thing funny and stupid to write here then i forgot it

seagull Compulsive Aussie Vee Dubber

4,979 posts · joined Dec 2003 · 16 Aug 2004, 9:38 pm

#219078

I would not play with it , see how it goes you can all ways pull them off later .

Looking for that special lady : PM me for coffee & cake

boof2332 Custom Title Time!

1,210 posts · joined May 2004 · 17 Aug 2004, 12:17 am

#219214

What carbs are you running????

I would just do a little port work to improve the flow of the intake and exhaust.....go to www.cal-look.com and see there article...do a search as there are plenty of others.

A nice merged exhaust..not thunderbird type.

Depending on the carbs or carb you pick, with the balancing and 009 dizzy should give a nice little power increase.

Good luck,

Matt

70AutoStik Insano Dub Head

730 posts · joined Aug 2002 · 26 Aug 2004, 1:39 am

#224527

392 degree cam? I think you might have mistyped there...

Stick with the stock valve size with an 85.5mm bore as any larger will just cause problems with shrouding, needing some bloody expensive redesigning of the combustion chamber or a ridiculous amount of lift just to get back to stock flow figures.

Compression Ratio depends a lot on what cam you are running, which determines where your engine will be making power, what fuel and how much other work is done to your heads. A figure of 8.0 for a pump fueled egine is a good ballpark (premium if standard combustion chambers, standard if reshaped and polished.)