440 Compression/quench/cam questions

[gtxrt]

The top of the piston is loose in the bore anyway, the skirt is where you measure and set the clearance.

the rings are now very close to the top of the bore. will the part of the piston out of the bore expand like the rest of the piston in the bore ?

 

[gkent]

the rings are now very close to the top of the bore. will the part of the piston out of the bore expand like the rest of the piston in the bore ?

.030 closer to the top - that's nothing ! Nothing to worry about.

 

[Rebelrouser]

Oh My!

Here is what I have. late 440 block, 30 over, Icon IC968 flat tops that are .022 above the deck. My original plan was to run a set of redone 452 iron heads. Compression with an .039 gasket and assuming 88cc's for the heads have me at 10.25 compression.
So I feel this is too high for iron heads so started looking at aluminum. A Stealth is 80cc's and Sidewinders are 84cc's. If I run a .051 gasket this gives me .029 for a quench area. Too little? Quench area on the 452's is.097 with .039 gaskets. Edlbrock has an 88cc open chamber.
Todd Marsh can assemble me a head to match the cam I choose and he is close by so there is that. They are angle plug heads but from what I have read not a big deal with manifolds.

This is a 74 Charger, Automatic 2300-2500 11" converter. 3.23 gears. HP exhaust manifolds. Performer intake with a 850 Thermoquard was the plan. I am looking for cruising drivability and need vacumme for AC and power brakes.

Cams. I was looking at the Crower 271HDP or the 267HDP. The 271 has very simular specs to the Voodoo 702 that I have in my 71 but that is a 4-speed with 3.55 gears, I like it. It has plenty of vacuume and a nice idle.
I called Crower and the tech was pushing the 277H over the above grinds. This is very much like the Summit 6400 and I have one of those on the shelf, but it seems small but would have a ton of touque.

I would be open to a gear change if needed but thoughts on if either the Crower 271HDP or 267HDP will work with the 3.23's?

Yeah I know I am all over the place but I can change most anything for this short block at this point in the build.

Thanks

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The compression is most likely not to high, IF you curve your distributor or ignition system for the proper curve. You will find most engines do not detonate at max rpm it is the lugging around 2,000rpm to 3,000rpm. When I spec out a street engine for pump gas I use a performance trends engine program it will calculate the proper ignition curve for whatever octane fuel you are using. Just set up the distributor and you are good to go.