Thread: 305 heads

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Can I have these heads machined to 202?Is it possible?

Originally Posted by powerlord

Can I have these heads machined to 202?Is it possible?

Anything is possible, but I believe others will tell you it's not worth the money.

Fortunatly my heads were in perfect condition ,otherwise its better to atleast get a pair of stock vortec heads for about the same as it will cost to have the heads you have upgraded and you will not be any farther than the stock vortec head.The old heads will need new valves/new seats cut in and at the minimal a bowl blend to even come close to the vortecs.Unless you have a port job done ,bigger valves decrease the flow due to turbulence,The small bore of a 305 does not need 2.02 valves because of bore shrouding and clearance issues.
However you will need a new manifold ,because the vortec heads have a different bolt pattern for the intake.

305 heads on ebay right now that the guy is saying have 2.10" intake valves.
I'd like to measure them and see,,,,maybe so?

Those heads would have been altered for a 350 by installing bigger valves, those will no fit in the 305 bore.

Originally Posted by shawnlee28

Those heads would have been altered for a 350 by installing bigger valves, those will no fit in the 305 bore.

Correct,neither would 2.02" valves if the heads are going on a 305 block.

I have #450, 305 heads that have 202's and screw in studs and guideplates, new springs, clips, retainers, and were ball milled to open them up behind the valves, and are 58cc.
On a 406 with 287 duration cam, for 2 1/2 years of every day driving, runs strong, and runs great, untouched for 2 1/2 yrs.
It cost me less then I could get Vortec heads to the same point.

You would have to notch your block to put them on a 305 again.

Pat