what are the runner port sizes and combustion chamber sizes and the valve sizes too i am thinking about putting them on a supercharged 305

The Corvette L98 heads have 163cc intake, 58cc combustion chambers, and flow lifts:

Lift Intake/Exhaust
.1 56/52
.2 120/120
.3 160/133
.4 186/150
.5 196/170
.6 199/175

With the added benifit that they are aluminum, I understand these are about the the best "bolt on" head for a 305. Only downfall, no EGR crossover.

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Rob
'86 TA 305 TPI
Gutted MAF, Ported Plenum
TB Bypass, Home made Cold Air Intake,
Edelbrock T.E.S.

I agree that they rank among the best for a 305.

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'88 RS (originally 2.8)
-350, .040 over, vette alum. L98s, stock tpi.
-305 injectors & chip
-TES headers & edelbrock cat back
-3.73 gears, 700r4.
Best with 2.8-17.4@77mph
Best with 305-15.0@93mph
Best with 356-13.7@101mph
on a 2.050 60 ft.
(Damn the 2.8!)

what is the setback of disabling my egr?

they say you can get an error code, however I am using these heads on my 350, and have not gotten any codes so far and the heads have been on almost a year and more than 10,000 miles, more than 4000 were on a road trip over 3 weeks.

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'87 Monte Carlo SS,with '89 IROC 350,700 trans, blew up 3.73 posi stuck with crappy 2.73's neeed gears! hooker headers, flowmaster 2 1/2" exhaust true dualls, recently installed a set of alum vette heads 58cc, new cam for a paxton, recently installed paxton, OMG need a posi bad. So if anyone knows where a buick GN 8.5" rear is let me know.

team fts,
unless your area emisions requires it, then
i wouldnt sweat egr. with a new head install
id look into a chip to recurve the timing
map (because of the compression and flow change)
the burner can remove the egr function.
airdeano