Did it carburate well out of the box with the tunnel ram or did it take some tuning? Also, it's time for a cam to let that thing breath a little.Took the car to a local car show just to get out of the house. On the way home, my son pulled up next to me in his 73 Mach 1. He walked away from me pretty easily. Now, in my defense, he has a 351 stroked to a 408 and a tremec 5 speed. But none the less, I would have preferred it to be a little closer. lol. So I decided it was time to lose the two barrel carburetor.
I installed the tunnel ram, a Holley 650 double pumper, Redhorse fuel pressure regulator, and full return style full system. I was originally deadheaded. The return style will better regulate fuel pressure as well as provide consistently cooler fuel to the carb.
Here’s how she sits now.
It started and idled with no issues. The carb is one I had sitting on the shelf for around 5 years. The rear needle seat needed a new oring. But other than that, the carb was surprisingly good still. I had to set float levels of course. I do believe I need to jet it up. I had to set the accelerator pump to squirt earlier and I’m thinking larger squirters will be necessary under load but it revs good in park. Haven’t been able to drive it yet because my throttle cable is too short. I ordered a generic cable and a carb base mounted throttle bracket. As soon as I get that, I’ll be able to see what the drivability is like.Did it carburate well out of the box with the tunnel ram or did it take some tuning? Also, it's time for a cam to let that thing breath a little.
I believe you are correct. I’m going to try and jet up the 650 as well as increase the accelerator pump flow. This is a temporary carb so I can enjoy it before the weather turns bad. Then a cam and new carb will come. Probably a 750 mechanical secondary to help prevent lean conditions in the rear cylinders.You're probably going to want 750cfm or more with that tunnel ram on 351cid. Do the heads flow enough for the ram?
Thanks. I ended up dropping the steering rack per the write up. Worked great. Unfortunately I created a power steering leak in the process. Welcome to my life. But the starter works great.
I ended buying a full set top and bottom mounting plates for the rear shocks. They also came with a good set of shocks. That worked out perfectly. I’ve been focusing the past several days dialing in the carburetor. I had a hesitation when accelerating. I put a different accelerator pump cam on both ends and that fixed the issue. I went with the orange cam which gave me a more aggressive profile to get more fuel faster. The car runs really good now. But I do believe I need to jet it up still. No real evidence other than seat of pants feel. It’s a Proform 650 street series carburetor. Currently has 73 jest in front and 74 jets in rear. I believe that is a little small for this large plenum tunnel ram. So I’ll be testing some larger ones when I get my jet kit in. What I couldn’t find anywhere is if these jets that are currently in there are the correct size for this carburetor. I’m trying to figure what it came with from the OEM. I got this carb used. So anything is possible. My belief is someone had it in a very mild small block. Because the accelerator pump cam was very small. And I believe these jets are pretty small comparatively. Does anyone have any information on what jets this carb originally would have had? Also does anyone have any experience with a good starting point in jet size for a 351 Cleveland with a large intake plenum? I know jet sizing is a trial and error thing. But I’d like a good starting point if possible.
Stock specs for this particular carburetor.
Does anyone have any information on what jets this carb originally would have had?
86/93 in Holley terms is huge for a 650.
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