wrench 87 I know you are in a hurry to get your car and motor done. Here's the thing, For the money differents between the box heads and having the heads ported and flowed, Is it not worth the wait? There is 20-50 HP by now having the heads done. I waited 13 months for a short block from my machinist because of speciality work he was doing. I hated the wait, but worth it in the long run.
I have a motor in the basement, Like you I have gotten most the parts. Block, Custom camshaft from KCR, TWM 58mm setup, T&D rocker setup, Edelbrock heads, pro flowed, DannyBee timing belt setup, All the Fle-Pro gaskets, all the ARP bolts and studs. I am working on the Drysump system. Work in process. Anyway save your money until you can do the motor right. Instead of doing stock heads and putting a large cam in the motor, WAIT. You will get no where near the power of the motor you are looking for. Your exhaust is another power choker, the side pipes on your cobra will cost another 20-40 HP without and other changes to the motor. I have 2 sets of pipes from ERA, one for the street, and the race pipes. There is a big differents between them. There are 3 spring numbers that should work on your heads if you go Beehive springs 1, #26120 The ones I use, they have a .600" max lift. You can cheat a little with hydro lifters on these. seat pressure is 145, max open is 377, rate on spring is 370 lbs. per inch. 2, 26055 has a .650" max lift. 150 seat, 410 open, rate on spring is 400lbs. per inch. 3, is 26095 this is the .750" lift this is the custom spring seat is 150 lbs. the max opening is based on cam lift. It is a soft spring with 293 lbs per inch. This spring is for running a light valve train with 8mm valves, aluminium rockers. small push rods, solid lifters and a rev kit if you build it. There are cross overs for the springs from say the 986 dual spring which alot of guys use to the 26986 beehive. They do the same thing but the beehive has less weight to control, again about 40 grams. Do yourself a favor and wait
Put the right stuff together you will save monet and be alot happier. I know.
Rick L. No I didn't stay at a Holiday Inn express last night.
I stayed in the basement looking at the boxes of parts.
