2.055"

There all 'smogger' heads. What I noticed so far if that there is plenty
of meat to get rid of the pushrod pinch completely. Always thought that was a T/A only deal.


587 production heads

4" bore @ 28" stock port w/ 1.88" valve

Lift--------Intake cfm
0.150------91
0.200-----124
0.250-----157
0.300-----182
0.350-----199
0.400-----206
0.450-----212
0.500-----214
0.550-----211
0.600-----206

So right there you can get 400hp from bone stock heads

This is from Chrysler Power magazine:
2.02 intake, hog out ports (pinch removed) blended guides, bowl

Lift--------Intake cfm
0.150-----110
0.200-----149
0.250-----183
0.300-----210
0.350-----232
0.400-----250
0.450-----267
0.500-----281
0.550-----277
0.600-----270

potential 550-600hp heads


W2 stock port
.050------30
.100-----61
.200-----120
.300-----166
.400-----210
.500-----236
.600-----244
.700-----234

Stock 587 heads beat the stock W2 up to .350ish lift, after that game over.
Ported 587 heads smokes the stock W2. But it's alot of work.. that
could be applied to the W2 lol.

What a head flows and what you get out of them for power are to totally different things!

Roger that. Best flow with the smallest cross section. Unless it's supercharged, then turn em into sewer pipes.

So looking at these heads, it seems that the exhaust springs only have a damper spring in them, none on the intake. Is that normal? Thanks.

Did they have the rotators on them.. that makes
them heavy

Dunno. Whats it look like? That round thing under the retainer?

They are a bearing that allowed the valve to
turn easier.. usually on heavy duty truck engines
I dont have a pic of them.. but they were about a
1/4" to 5/16" thick... took the place of the retainer..
you would know if they were on there.. someone could
have puled them off.. I always trashed them

the valve on the left side of the pic has the rotator usually on the exhaust valve from my experience.

If I remember the numbers right, back in the late 90s Ritter-Webers Daytona went some 7.70s with the 360-W2s and a single four in comp. I was impressed with how fast and loud that small block car was! I bought a set of 15-33 Goodyears with two passes from them for $100 that day, nice guys

The spring on the left has a rotater. They were on exh valves on truck engines. If you were building a mild engine and wanted 340 springs you could not do it. The valves are made for a shorter spring. For what you are doing you will end up with .100 long sb chevy valves or maybe magnum valves. Don't try LS valves, I just did a set with LS valves, and what a PITA

If you have not yet, before you go buying this and that, get a plan on paper and stick to it.

You could end up thousands ahead in the end, or be like alot of us and just be sitting on alot of parts you might get 1/2 of what you paid.

Even thin pushrod walls will crack with alot of heat cycles, and with little trouble the K&S metals #8139 1/2x.014 tubes fit the pushrod tubes.

Yep. Parts. All in the guys apartment lol.

1974 360 .030 over


1973 360 Std bore


1976 360 Std bore


Game plan is the same. Cept going with W2's.