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Author
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Topic: speaking of heads....
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james306
Journeyman Posts: 80
From: falmouth,me,usa
Registered: Feb 2003
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posted 02-27-2003 06:46 PM
   
on my little 306 i am in the process of porting a set of D0OE 351w heads. i have only begun so if you can change my mind it wont bother me a bit. should i continue with porting my D0OE heads and install 1.94/1.60 ss valves or should i port/polish and add 1.94/1.60 ss valves to a set of 68 302 4V heads. i will arive at 10:1 compression with a simple swap of pistons depending on which heads i run. i like the closed chambers of the 302 4V heads for a better swirl affect. what do you guys think i should run?
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Mpcoluv
Gearhead Posts: 945
From: Charlotte NC usa
Registered: Apr 2001
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posted 02-27-2003 07:23 PM
How about aftermarket heads?
The 351 heads have bigger port volume, so if you are stuck with factory castings, they are the way to go.
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jdsgallops
Gearhead Posts: 326
From: Naples, FL
Registered: Feb 2001
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posted 02-28-2003 09:46 AM
To get the 302 head to flow as much as possible you need to take it out to the 351 heads dimensions anyway, so the 351 head will take less work to get to the same end product. Chamber volume on the 351 heads isn't that large that you can't find a piston to get the compression where you want. Running the 302 head with a mill clean up will put you over 10-1 if the piston is 0 decked, which leads to a pump gas problem. Swirl isn't something normally associated with a stock head, until you get into the newer castings. The smaller chamber will only shroud the valves at lower lifts, hurting low lift flow. This can be helped by deshrouding, but again that is more work. You would then be wise to cc the chambers and make sure they are all equal, again more work.
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