OLDER ENGINE SPEC's

[X-TECH MAN]

Originally Posted by Larry Hill

Would you please post the spec's for the 428 1967 Shelby.

Thanks Larry

LOL We all know what I have in my old NHRA book isnt what is being run today.
Both of these are 428's.
The only single 4 version is listed at 355 HP. Uses a 4150 Holley carb.
.485 lift cam w/solid lifters.
68.0 CC heads
small exhaust valve @ 1.566. Intake @ 2.037
The rest is what is listed today by NHRA in the newer books
The 2 four version is 390 HPand uses 2 each 4160 Holley carbs
same head specs as above and a Hydraulic .481 cam.
The spring pressures and duration/overlap specs I have listed dont matter for today's NHRA rules for either one.