12 Second N/A Slant 6?
Picked up the heads today & dropped them off to be tanked, checked for straightness & magnafluxed.
I'll see what I have next week. I'm going to pick up a head cc kit from Summit.
It's time I started doing this myself.
RustyRatRod:I'm still waiting to see how you shifted the rocker shaft up & sideways.
Anyone know where I can pick up a "big bore" \6 head gasket?
Aussie has them, but the prive is a bit steep if you ask me.
They also never replied when I asked the compressed thickness.
Are there thinner hi performance gaskets out there?
Something thinner than .035 will allow me to keep the top ring a bit further down in the hole.
I think the top land is something like .220" on the KB 268 piston.
Anyway, I need the big bore gasket to locate the counterbore into the head deck.
So here's how things have "morphed".
Since it looks like 10:1 might be hard to accomplish W/a minimal quench height, I've decided to pull out allm the stops & go W/the geometry that will give me a near ideal .040" quench.
That's going to get me into the 13:1 CR range.
Pump gas will not work unless I can get a water/methanol injection system working.
I think I can do that, but if not, I have aviation gas as well as 110 octane gas available locally.
Damn I wish we had E-85 in these parts! It would make this sooooo much simpler.
A "bigger" cam, something in the 256/262 duration range W/.595 lift, 113 LSA 114 ICL will fit the combo better than a milder cam.
Since this combo will be spinning a bit higher in the RPM range I'll opt for the shorter runner Aussie Speed manifold in lieu of the "Hurricane".
I like the removable plate on the plenum. It will allow a fogger plate to be sandwiched between the base plate & plenum.
Aussie Speed says that removal of the plate actually hurts flow so rather than having a fogger plate directly under the throttle plate of the carburetor, the sanwich set-up might get better results when running N/A.
Carburetor CFM will probably need to be in the 750-800 CFM range.
I pretty well have the block figuered out, now I need to determine what to do W/the heads.
I'm still thinking along the lines of 7mm stem valves & keeping the valve head diameter on the moderate side. Maybe 1.7" to 1.75"/1.5" IN/EX.
It makes sense that the cross ection of the ports are not that large so rather than blocking a small hole W/a big valve head, optimizing flow W/small stem diameter & a moderate sized valve head might be the way to go.
BTW: I just picked up this used Hemi.
4.50 Cu In & it makes 6.1 HP, & yeah, it's a Hemi.
Picked up the heads today & dropped them off to be tanked, checked for straightness & magnafluxed.
I'll see what I have next week. I'm going to pick up a head cc kit from Summit.
It's time I started doing this myself.
RustyRatRod:I'm still waiting to see how you shifted the rocker shaft up & sideways.
Anyone know where I can pick up a "big bore" \6 head gasket?
Aussie has them, but the prive is a bit steep if you ask me.
They also never replied when I asked the compressed thickness.
Are there thinner hi performance gaskets out there?
Something thinner than .035 will allow me to keep the top ring a bit further down in the hole.
I think the top land is something like .220" on the KB 268 piston.
Anyway, I need the big bore gasket to locate the counterbore into the head deck.
So here's how things have "morphed".
Since it looks like 10:1 might be hard to accomplish W/a minimal quench height, I've decided to pull out allm the stops & go W/the geometry that will give me a near ideal .040" quench.
That's going to get me into the 13:1 CR range.
Pump gas will not work unless I can get a water/methanol injection system working.
I think I can do that, but if not, I have aviation gas as well as 110 octane gas available locally.
Damn I wish we had E-85 in these parts! It would make this sooooo much simpler.
A "bigger" cam, something in the 256/262 duration range W/.595 lift, 113 LSA 114 ICL will fit the combo better than a milder cam.
Since this combo will be spinning a bit higher in the RPM range I'll opt for the shorter runner Aussie Speed manifold in lieu of the "Hurricane".
I like the removable plate on the plenum. It will allow a fogger plate to be sandwiched between the base plate & plenum.
Aussie Speed says that removal of the plate actually hurts flow so rather than having a fogger plate directly under the throttle plate of the carburetor, the sanwich set-up might get better results when running N/A.
Carburetor CFM will probably need to be in the 750-800 CFM range.
I pretty well have the block figuered out, now I need to determine what to do W/the heads.
I'm still thinking along the lines of 7mm stem valves & keeping the valve head diameter on the moderate side. Maybe 1.7" to 1.75"/1.5" IN/EX.
It makes sense that the cross ection of the ports are not that large so rather than blocking a small hole W/a big valve head, optimizing flow W/small stem diameter & a moderate sized valve head might be the way to go.
BTW: I just picked up this used Hemi.
4.50 Cu In & it makes 6.1 HP, & yeah, it's a Hemi.
