Thank you Cliff!!

Good morning Cliff, hope all is well. I have finally got around to assembly of my 474 The last time we spoke you were helping me on camshaft selection. I decided on a Bullet Cams-hydraulic roller with 243/251 duration at .050. I need advice on which solid roller lifters to use, valve lash and if I need oil pinned lifters. Thanks again Cliff for all your expert help and advice.

Grind NO. PO 299/306-10HR
Intake Exhaust
Duration at .050 243 251
Lobe Lift .3677 .3680
Separation 110 OP-CL OP-CL
Timing Events @ .050. 15.5 47.5 59.5 11.5
Duration @ .006 299 306
Gross Valve Lift 1.5R 552 552
Gross Valve Lift 1.65R 607 607
Valve Lash (HOT) .000 .000
Degree Intake Lobe To 106

Thanks for your help Cliff.

I’m not sure of which lobe lift or center line to use? I’m thinking this Custom Grind should meet my target goals.
What do you think? Thanks for you advice.

248/256 @ .050 duration
614/614 w 1.52 r
675/675 w 1.65 r
111 or 112 LSA

Thanks for your help Cliff. I don’t understand why Butler would recommended an Extreme Marine Grind, unless it’s just the lobe lift that he was looking for. I think that grind and lift is probably 625 ish on HP. And the 111 LSA? I was thinking 112.

Lobe 3371/3373
.380 lobe lift
.570/.570 w 1.52
.627/.627 w 1.65

Cliff, I am building a 455 stroker and need some advice on camshaft selection. I will be using a hydraulic roller and was advised to use solid roller lifters. My target hp is 650 to 660 hp, pump gas, power brakes with street manners in a 3900 lb car with a 4 spd M-22 transmission. . Compression is 10:6 to 10:8.1. This car will be mainly driven on the street, and I would trust your advice over many. Thanks in advance. Jimmy

73 455 block bored .060 over with zero deck height
474 stroker
Ohio forged 4.25 crankshaft
Weisco flat top pistons 10cc valve relief
Crower 6.700 sportsman rods
Kauffman High Port heads
Northwind 4500 intake
Pro form 850 carb
Doug’s headers
12 bolt GM reared with 3.73 gears
Muncie M-22 transmission

Lift Int. Ex. Int/Ex ratio
.200 134 134 100%
.300 201 186 92%
.400 260 227 87%
.500 306 255 83%
.600 332 265 79%
.700 342 271 79%
.800 350 277 79%

254/262 duration @ .050
.570/.570 lift with 1.52 r
.627/.627 lift with 1.65 r
111 LSA