Dan, be careful with those heads. I think they are the ones that are famous for tearing the rocker studs out with alot of valve spring pressure. They might fetch enough from a resto guy to buy some tougher heads. JMHO. Good luck with your project, I LOVE those old gassers. :thumbsup:

 

tunnel ram- run some vacuum secondary carbs and if you go that route use at least 750 carbs, this allows a weaker signal in the primary and gives you control over the secondary opening rate.

i put 600 holleys on my 468,11.7 to1, solid roller cam engine 685 lift 268@.050" and the secondary opening rate was to fast even with a black spring, signal was just to strong, i swapped them out for 2 750 carbs and problem was solved, by the way i ran the same e.t. and mph with both sets of carbs.

i putting together right now a 468,10.7 to 1, rectangle port combo (325cc runners) i'm going to try the 600's again, my thinking is the big ports and low compresion are going to hurt velocity and maybe the carb signal thru the primary's might be weaker and the secondary's wont come on near as strong.

of course i could be wrong, in that case i will throw the 750 carbs back on.

 

watch out for the Holley mech secondary carbs with no sec accelerator pump, these are being sold as a kit with the TR manifolds. mech sec, no pump, guess what happens when you nail the throttle? A couple 600s like the old #1850 are good.

 

Dan, be sure to use the extra long rocker studs in those. We actually double helicoiled some 074's after they pulled an exhaust rocker arm boss clean off the head. They were extra long threaded ARPs studs. A MUST HAVE!

Use the roller lifters with a mild pro street style SR cam. If they're in good shape that is. Lunati makes a SR version of my old Ultradyne short track cam, and it would be a dandy in 496, with peak HP at around 6300 is all. Specs out at 243/251@.050"/.660" on a 112LSA.

 

I use two 1850 600's on my small block tunnel ram and have to give them a big thumbs up! The throttle response really suprised me how crisp it is.

Tom

 

You can use the heads you have, they are good heads. But I would grind the fin out of the exhaust. This was the only difference between the c port and more desired D port head. I had to match a head for my dad, when he blew up his motor and that was what I did.

 

i have a vertex mag if your interested, was rebuilt in 2006, really give you that look, lol
PM me if your interested

 

Thanks to all for the help and ideas. I'm enjoying gathering pieces for this project.

 

A place in Grand Rapids, Mi. has the old Hilborn Injection. Talk about getting attention!!

 

The Hilborn injection would be cool, but I'm not sure I could get it to run right on the street unless I did an EFI conversion.

Got an old GM aluminum square port high rise intake I may use just to get it running, and then figure out where to go from there.