I’ve got a pair of tunnel ports that have the holes also.   Was told that it was to beat the p&g pump test

Another vote for double belts

The motor has been together forever.   The low compression was to make it happy on a decent shot of nitrous but never hooked that up.  The pistons are flat top venolia.  Heads have been cut a mile, 72cc, I think.   Going by memory, I dont remember the pistons being down the hole.  Most of it was done by the machine shop.   I kinda think I may have the piston box with all the info on it somewhere. I’ll look for it after the Christmas holidays.  Pump gas was pretty bad around here in the late 80’s when this was done.  I drove it a lot on the street and wasn’t too concerned about nice drivability.     It’s in a 70 Mach 1.     Previous motor was a 11.7:1 medium riser and keeping that from rattling on anything but race gas got old. 

A “ton” of power as in 20 or like 50?      I have been seriously thinking of doing a big 460 ish engine (385 series) swap, but it starting to seem like this combo may need more attention before a full on engine swap. 

My tunnelport is 9:1. 458”  roughly 4000 stall converter.  4:10 gear.   Single four barrel.     Has a f244 crane in it now.  I think it’s 244@.050.  Solid flat tappet.   Going by memory here.   I think about .580 lift.      I thought it was on a 114 spread.     I tried to get closer lobe center but the crane rep didn’t think it was wise.     I always thought some power was left in the table.     Motor ran ok but always seemed like it needed something

I, personally, wouldn’t buy another.    I have four or five now.   One works.  One tests good but won’t start anything.   One won’t hold a charge over night.  One loses charge over a week.   I wanted them because they are kinda sealed and usually don’t vent any acid out to eat up connections and surrounding metal.  I got a couple other sealed batteries , I think the brand is Mkpower.  They will outlast an optima four times over. I believe the MK is a deka battery and it’s an agm style.    I bought them used from the scrap place and still got six years out of it.

585@6200

I’ve used the old under dash box before and wasn’t really impressed with the air flow from it.  Really was hoping some of the behind dash set ups would move a lot more air and probably do.   Still kick myself from not gettin a factory air set up out of a junkyard car years ago when they were plentiful    Florida summer and a big block is not a very pleasurable combo without ac.  Was pretty much seeing which set up would be better than the others.    Thanks for the feed back so far