Rocker Arm Clearance Guide - What's Your Problem?

The Trick Flow Specialties head you mention is TFS's classic 23-degree aluminum small-block Chevy head, which works very well and is an excellent alternative to putting money into stock iron heads ($1,130.95 from Summit Racing). This is the entry-level head with a high-velocity 175cc intake-port volume and 1.94/1.50 valves. It's a good choice since the larger 2.02-inch intake valve won't fit the small 305 bore. We'd go with a little more cam than that factory HT 383 grind. One thing in your favor is that you can reuse the stock factory hydraulic roller lifters, so all you should need is the cam. Crane builds a hydraulic roller called the Zcam that's slightly longer in duration at 214/222 degrees at 0.050-inch tappet lift (276/284 degrees advertised duration) with the big incentive being the added lift of 0.488/0.509 inch on the intake and exhaust (PN 109821, $295.95 from Summit Racing). This added lift with the TFS heads would really wake up that little 305, but it will increase the peak-torque rpm point, which may not be your goal. If you stick with the iron 461 heads, your original cam choice will probably be better, only because the iron heads may not be able to accommodate the extra lift without additional machine work.

This is Gary's solution to his rocker-arm location problem: creating a guideplate without having to machine the head.
This is Gary's solution to his rocker-arm location problem: creating a guideplate without
Always check for lift capacity when changing cams. Generally, more lift with stock-type heads can cause problems between the retainer and the top of the valve guide where the seal sits.
Always check for lift capacity when changing cams. Generally, more lift with stock-type he

Muscle Car Tech Tips 426 Hemi Crank Shaft

'CC Quickies
Hemi Crank Fact
Only the 426 Hemi came with an eight-bolt flywheel/flexplate flange. All others used six-bolts. The Hemi crank material was also superior and featured nitride-hardened journals for increased reliability under extreme duress.>>>

More Info
Crane Cams; Daytona Beach, FL; 386/258-6174; cranecams.com
Summit Racing; Akron, OH; 800/230-3030; summitracing.com
Trick Flow Specialties (TFS); Tallmadge, OH; 330/630-1555; trickflow.com

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