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Old 02-12-2009, 10:06 PM
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milling gm 350 290 hp.. heads

Hi guys.. I have a 4 bolt 1976 350.. And just picked up these heads for next to nothing only 3500 miles..He got some vortecs..anyway the heads are the gm crate motor 350 290 horse heads..194/150...76cc.. How much can be milled of these to get a little higher CR..( Motor will not be raced just saturday night stuff)
Whats the general rule to max milling, to where the other components need to be changed..ie push rods ect ... How far can i go..I guess some where in the 9cr is a nice number.

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Old 02-12-2009, 11:35 PM
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hmmm paid 125 buck and came with the stock cast intake aswell..all like new...I guess they will sit..But you say i could use the valves in other heads.. never thought of that..
not a total loss anyway.
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Old 02-13-2009, 12:06 AM
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getting some great info and ideas from ya here..To be honest with ya i picked up this 350 block about 6 years ago and cant remember what the pistons are. But dont think there dished..
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Old 02-13-2009, 01:27 AM
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Got my eye on a 1960 pontiac two door with a six in it.. Plan is to go roller block with vortecs..Having doughts on that tho price and all..but just couldnt pass on these heads.. ..But getting the parts together for the engine now..
Thanks..
Funny ..The little woman goes whats those for i say a car motor..She sez..What car....To funny
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Old 02-13-2009, 01:32 AM
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Funny ..The little woman goes whats those for i say a car motor..She sez..What car....To funny[/QUOTE]

Whoops! Let the cat out out the bag.
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Old 02-13-2009, 12:23 PM
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Quote:
Originally Posted by candrive55
Hi guys.. I have a 4 bolt 1976 350.. And just picked up these heads for next to nothing only 3500 miles..He got some vortecs..anyway the heads are the gm crate motor 350 290 horse heads..194/150...76cc.. How much can be milled of these to get a little higher CR..( Motor will not be raced just saturday night stuff)
Whats the general rule to max milling, to where the other components need to be changed..ie push rods ect ... How far can i go..I guess some where in the 9cr is a nice number.
There's a reason why why these heads were cheap and the guy you got them from bought Vortecs.

The big chamber heads are boat anchor candidates, you can fix them to some extent, but the money you spent for them and the money you'll spend trying to make a silk purse out of a sows ear would have been better spent on a set of Vortecs.

If the heads you bought are 1976 production or newer only about .030 is safe to mill. Check their casting number against MorTec's list for a rough idea of their year of manufacture.

Bogie
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