Is that with a zero deck?
Edelbrock heads...Am I crazy?
- Thread starter KevinB
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Is that with a zero deck?
Almost. The 167s are a zero deck piston and I did not have to mill any off the deck and still have good quench with closed chamber heads. https://www.uempistons.com/index.ph...id=521&zenid=9a75800960bf4cd005d9d0143d10382c
So if the 167's are a zero deck piston, you put in 0 for deck clearance. What would you then put in for piston head volume? It is listed at 5.0 cc for the ones I'm looking at, but would you just put 0 on the calculator?
KB 167 pistons will get close to zero deck depending on your block.Ma Mopar shot for a 9.60 deck height and the kb piston will bring you to 9.578,so your deck will have to be machined and square decked to achieve zero deck...
The 5cc is for the valve reliefs.
Ok thanks that makes sense!
So using the keith black calculator and setting the decl clearance to .022 (assuming I don't zedo deck the block), I get a CR of 9.24:1, which is within the range I wanted to be in.
So the current plan is:
Aerohead cylinder heads with hardened seats (I still don't know if I need the bigger valves or not!)
KB 167 pistons
Crankshaft rebalance
Full rebuild kit
Comp cam 268 kit
Performer intake
650cfm carb
TTI Headers
:burnout:
Just simply add 5cc's to the head chamber.Gasket bore size will not be 3.92. Find the actual gasket specs and enter them in.
Calculate the Pistons at zero deck and re-adjust the comp ratio with a .039 thick gasket or a .055 since there common.
Calculate the Pistons at zero deck and re-adjust the comp ratio with a .039 thick gasket or a .055 since there common.
stixx
Well-Known Member
The heads you mentioned (399$/pair) do not offer the bigger valve option... but with a mild 318 you won't need the 2.02 valve anyway IMO.
So putting in the correct gasket size, 5 cc added for the piston and 0 on the deck clearance, I get 8.97:1, which is close to where I wanted to be, but if I can get a little more out of it I'll try.
I found Summit sells a .028 thick head gasket, but I can't tell if it will hold up or not:
http://www.summitracing.com/parts/mrg-1121g/overview/make/dodge
Using that gasket gets me 9.23:1, which seems much better on paper, but am I splitting hairs at the point?
Yes
Ok so I think my last question is:
Assuming that the KB 167 pistons will sit .022 down in the hole, per the other poster's claim, I'd have to have the block decked that much to get a true 0 deck. How much can I deck the block before I have to alter the intake?
Dartswinger70
Well-Known Member
Isn't there something about the 2.02 valve scraping the cylinder wall on a 273-318?
273 yes, 318 no. Please note that this is a 3 year old thread.
Wyrmrider
Well-Known Member
ported 308s, 308's have a nice chamber
you can always change heads later
the heads make the power but you can make your goal with 308, 360 or Magnum style if you already own the 308's that's what to do for now
use a 4 hole spacer at least to start
The cam is the heart of your motor
Why turn a nice MOPAR into a chevy?
you can always change heads later
the heads make the power but you can make your goal with 308, 360 or Magnum style if you already own the 308's that's what to do for now
use a 4 hole spacer at least to start
The cam is the heart of your motor
Why turn a nice MOPAR into a chevy?
nm9stheham
Well-Known Member
If anyone is reading for info...... Head gasket bore will be more like 4.12. Chamber volume is about right. Deck clearance is incorrect; you show -.060" ( below deck) it will actually be -.012" (below deck). I get 8.9 Static CR with that head gasket, .012 deck clearance, and 4.12" gasket bore.
To bump the CR up, change to .028" thick head gaskets (Mr Gasket 1121G) and shave the heads .020" which will drop chamber volume about 3-3.5 cc. With that, you will now be around 9.4 for SCR. You can shave more to get the chambers smaller if you wish. If you do the valve change, consider changing both valves from the dimpled valve face type to flat valve faces; that will drop about 2 more cc's from the chamber volume.
MOPAROFFICIAL
If it has tits, it's a liabilititty.
That price is each, not a pair.
500.00 will rebuild your stock heads, that's less than a 1/3 of the cost of edlebrock
500.00 will rebuild your stock heads, that's less than a 1/3 of the cost of edlebrock
MOPAROFFICIAL
If it has tits, it's a liabilititty.
Re done 1.88 360 heads will flow more than areoheads with bigger 2.02 valves... you have to bowl blend them!!
Wyrmrider
Well-Known Member
what's an aero head-- rock group groupie?
stixx
Well-Known Member
--> Aerohead Racing
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