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#1
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Hydraulic Roller Cam Schooling
Good Day All
Toying with the idea of installing a roller cam in a 1966 Tri-power. Basic info: Stock Tri-power .040 389 with dished pistons Stock four speed 3:55 gear (may be converted to a 3:08) 670 Heads Stock Exhaust Used for cruising I'm considering this due to the head change as the stock pushrods/rocker assemblies need to be changed. Admittedly, my eyes cross when it start looking at the specs : I don't have a clue what all of that means. What I'm looking for is: What all needs to be changed What am I looking for as far as specs Any machine work needed Not looking for anything radical, just dependable If more info is needed, let me know. Thanks to all who respond Omni |
#2
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Figure to spend about $1000.Cam,lifters,and springs for sure.Depending on the cam you might need some machine work on the spring seats and if you have not upgraded the studs that should be done at the same time.Tom
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#3
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Some builders do not like retrofit roller lifters. What did you decide?
We're on the fence now with a 428 deciding between Comp Cams 8022SP Hydraulic roller vs. Comp Cams Xtreme Energy flat tappet EDM series solid lifters. Engine builder claims the solid flat tappet lifters are as quiet as most hydraulic lifters. Either cam would be a modern version of the RAIV cam with more lift and more duration, wider power band. What do you think?
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
#4
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I've not yet used a hydraulic roller. Nor have I had a flat tappet go flat - yet. But I've only built a couple of engines. However I'm going to put hydraulic rollers in both of the Pontiac engines I have left to build and already have the cams. Will also put one in an FE Ford engine if I get around to building it. All or almost all modern oem engines made use hydraulic rollers and that says it all IMHO.
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#5
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I just built a 428 RA V engine with a custom Comp hyd roller cam and their lifters.Have put about a hundred miles or so on it now with no issues.FWIW,Tom
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The Following User Says Thank You to tom s For This Useful Post: | ||
#6
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Nothing wrong with a HFT, my builder talked me OUT of a roller on this engine & no regrets here. I had a HR in my old 400 and loved it, too. HFT could free up some $ for you
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Chris D 69 GTO Liberty Blue/dark blue 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3905lbs 11.59@ 114, 1.57/ 60' |
The Following User Says Thank You to OCMDGTO For This Useful Post: | ||
#7
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I switched to a hydraulic roller, and I'll never look back. I was tired of engine break-in and proper oil. I have a 0.030" over 428 with 670 heads and a '66 tri-power. I went much larger than you should because I run nitrous. The cam is too large without nitrous, and too small with it. But I was getting tired of messing with the tri-power with a big cam. I used to use a 253/260 HFT. I now run a 242/248 HRT. Both of those are measured at 0.050". Net valve lift is about 0.600 with 1.65 rockers. I'm probably 1-2 sizes too big for a "normal" street engine, and you'd need to drop one more size due to your smaller stroke. Save your self some trouble and get a recommendation from the Butler's.
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#8
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Quote:
Butler suggests the Comp Cams 8022 SP hydraulic Roller with Johnson Lifters. This is also described as a modern RAIV cam with more lift and wider power band. What do you think?
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
#9
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I like Butler's suggestion, but I'm prejudiced. It will be healthy, and certainly not too small. I'm not that familiar with the Kaufmann heads, but if they keep flowing better up to 0.600" lift then I would consider using 1.65 rockers on the Butler cam. Assuming the valve train can handle a total lift of around 0.560".
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