greenslade

comp cam--42-220-4
comp lifters-852-16
comp pushrods----7582-16
comp timing set---3213
comp rockers---1442-16
clevite rod and main bearings
mahle oil pump
victor reinz gasket set
(parts on order)
comp 11/16 single grove locks-601-16
comp rocker studs-4542-16
comp guide plates--4842-8
comp spring shim kit--4744
(parts in summit shoping cart)
ARP head bolts-180-3600------removed
ARP main studs--185-5401-----removed
ARP rod bolts--185-6001
speed pro pistons---ZL2323F30--replaced with kb132-30 with rings
sealed power rings--ZE2430K30--removed
sealed power freeze plugs--Z3818020
mr gasket rear main seal--mrg1965
Questions;
Are those piston rings a good choice?
What do you do with head bolts,2 of the original had studs on top for A/C brackets?
Any and all sugestions welcome.note I can change any thing in the summit shopping cart.

cutlassefi

Gear? Heads? Intake? Carb? Intended use?

greenslade

Diff 273 number on crown gear-41B15 GM Z8 0892, 41 teeth on crown and 15 on pinion.
th400 trans -was thinking of upgrading to an over drive trans but may not with this diff.
Stock intake,may block off egr ports
J heads A.I.R bumps removed will do a little home porting and have valve grind.
will use the original Q jet and dist
Car is a 1973 98 will be summer use,running around town,to and from work,possibly some trailer towing on week end outings.

cutlassefi

You'll need to use the 2 bolts. Those rings are fine if they're what I think they are.
Compression may be a bit high for that cam and gear or the cam and gear is wrong for the compression. You'll need to run 91 or better for sure, those pistons will give you about 9.5-9.75:1.
However you do it, you'll need something with more off the seat time for the best performance, especially when running stock manifolds. But when the combo is right it should be a nice cruiser.

Jmo.

greenslade

thanks again,I already have the cam so changing that is not my first choice.Pistons are not ordered yet,will look for some with a 25-30 cc dish and get ratio down to 9:1 or there abouts.

greenslade

Checked out Keith Black KB132-30 hypereutectic pistons with a 30 cc dish and 1.750 compression distance ,if i figured right,that will give me 8.97:1 ratio and if I take .012 off the heads it should change to 9.1:1,those figures are based on 79 cc head with a .028 head gasket.Would those pistons work better with the cam /gears I have?

cutlassefi

Imo yes.

greenslade

ordered the kb132-30 kit with rings,cancelled the head and main bolts,will re use the old ones.

panos

Why did you cancelled the main and head bolts?Imo thats cheap insurance against the 35+ year old originals.You dont have to build a race motor to have good bolts that holds your motor together!

cutlassefi

Even with 9.0:1 I would still change the cam, that one is best suited for an 8.0, maybe 8.5:1 application tops.

Jmo