Hey all, I’m very active on FB and Instagram in some communities but figured I would bring it over to here to get some details during my rebuild. I have a 77’ GP. Beautiful car and had it about a year now. Since I’ve had it, I experienced low oil pressure and I pulled the engine and the bearings were shot. Decided to do a full rebuild. So here’s where I’m at.
406 cubic inch displacement
4.150 bore 3.75 stroke
Camshaft: (comparable summi 2802) 224/234 duration @ .050 114 lobe separation .466/.488 valve lift (actual cam .471/.486)
Keith Black Hypereutectic flat top pistons compression height 1.72” +6.00cc volume
Cylinder heads: #15 stamp
Valve size:1.96 intake/1.66 exhaust.
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Ram Air exhaust manifold 2.45 diameter feeding to 2.5 true dual flow master 40’s.
Carburetor: Quadrajet 7040263 800cfm
Edelbrock Performer RPM high rise intake
Deck height .023
Compressed head gasket thickness .040 FelPro 8518PT
2500 stall
I recently picked up the #15 heads to upgrade from my ‘73 heads. The cam is from the previous owner and I figured I’ll stay with it it’s in good shape. But with the new heads, I was wondering if u can simply swap the valve train over to the 15s from the 46s (those springs and valves were in great shape) or do I buy all new springs? They are being taken to the machine shop to get new seals and cleaned up. I was doing research and maybe the comp cam 988-16 springs would work? It ran great with the springs that were on it before I pulled it.
Also, I believe this cam may be a little too much even with all these upgrades. the summit 2801 would be ideal, but It ran so good with just the stock setup so I figured I’d keep it with this setup and see better gains maybe. I’ll be at about a 8:9 to a 9:1 compression.
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