So I ordered a GM L31 vortec long block to build for a 77 Monte Carlo as a street strip car. I am curious if anyone has ran the comp cams bee hive valve springs part# 249-26981-16 with 249-787-16 retainers. I am looking at using the Edelbrock Rollin thunder cam Edelbrock#350-2209 the lift is .462/.479 and I just want to make sure I am not going to have a retainer to valve guide seal clearance issue. I plan on using the Proform stud removal and guide tool to install screw in studs for the added spring pressure but would love to avoid having the heads machined for larger springs and different valve guide seals to obtain more clearance for lift.
Well ordered the 787 retainers and some LS6 springs but after calculating seat pressure I am just going to use the comp beehive springs. I just ordered a digital micrometer and proforms stud removal and guide tool so I can pull my head studs and tap them. I have a set of head gaskets as well as a few other parts laying around from a failed project a few years back. I also decided to have comp cams do a custom grind for me that is a little on the tamer side of things but am waiting tell I measure retainer to seal clearance before I order my cam. Thinking 204/214 @ 0.050 256/266 advertised .428/458 lift with 1.5 rocker on a 112 LSA. I am also going to run a performer EPS intake and either an edelbrock 600 or a 625 demon carb. I have one piece push rods laying around and will be running roller rockers as well as a double roller timing chain, moroso 7qt oil pan with matching stock pressure pump and patronics flame thrower distributor I have modified a little as it came with no advance weights and the vacuum advance was locked out, but it only had about 5 hours of run time on it and was free. I don't have a HP number in mind but am thinking it should make around 275 RWHP and 350 RWTQ and am hoping it has around 17" vacuum at idle. with a idle to 5,000 RPM power band. Will be using a 2,000 RPM stall with this with a TH350 but will be later swapping to a 700R4 and 3.25 rear gears in my 77 monte carlo so when things are on the road I will do a build thread to stay tuned. I would love to be able to hit a high to mid 13 and get close to 20 MPH on the freeway after I gut my car.
did you see this article..http://www.customclassictrucks.com/techarticles/0405cct_vortec_cylinder_heads_small_block_chevy/i don't recall if i linked it to your earlier threads..
I don't remember if you linked it or I found it searching. Would be a good swap but would not increase spring pressure and would have to have a valve job done if I went this rout. Old valves on a different head would not seal very well. I will measure my heads with the old and new retainers to see if there is a difference, if not I have the tools to cut both the retainers and valve pockets if it comes down to it. I am a little afraid of messing things up cuz the tools don't come with instructions and I am un sure how to judge my depth using the valve guide tool. It all depends on how much room I have when I measure stuff. If I have only .460 I will have a custom cam ground, if I can fit the Edelbrock rollen thunder cam than I will run it which has .462/.479 lift and if my clearance us under .460 I will grow a pair and cut the guides down.I have enough in my budget to replace a head but I don't want to look like a dumb ass in front of my wife and have to explain that I ruined a head.