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STOCK HEAD W/BIGGER VALVES #2466583
03/14/18 08:24 PM
03/14/18 08:24 PM
Joined: Oct 2008
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East Coast
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A/MP Offline OP
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I came across a MP 308 bare head with 2.05 intake and 1.62 exh. All the ports are stock less the bowl cut port. Will this head make more HP with just the larger valves? Special cam specs? Since this is only 1 head, if its not going to make more HP then I won't have a used spare head modified to match. Thanks.

Re: STOCK HEAD W/BIGGER VALVES [Re: A/MP] #2466655
03/14/18 11:06 PM
03/14/18 11:06 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
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Author Dulcich has some informative SB porting articles & I've seen some 308 info there. You might Google it.


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Re: STOCK HEAD W/BIGGER VALVES [Re: A/MP] #2466676
03/14/18 11:43 PM
03/14/18 11:43 PM
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East Coast
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Nice article. Wish they had posted some pics. If a 2.02 valve is good, then 2.05 better?

Re: STOCK HEAD W/BIGGER VALVES [Re: A/MP] #2466687
03/14/18 11:55 PM
03/14/18 11:55 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
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I would think, if the chambers were unshrouded (which would obviously add CC's/affect your SCR) (& do bowl work).


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Re: STOCK HEAD W/BIGGER VALVES [Re: RapidRobert] #2466699
03/15/18 12:09 AM
03/15/18 12:09 AM
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pittsburghracer Offline
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I wish it was always that simple. But it isn’t


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Re: STOCK HEAD W/BIGGER VALVES [Re: pittsburghracer] #2466718
03/15/18 01:00 AM
03/15/18 01:00 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
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^^^ agreed, it'd need to be compatible with the cam etc.


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Re: STOCK HEAD W/BIGGER VALVES [Re: A/MP] #2466773
03/15/18 06:19 AM
03/15/18 06:19 AM
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East Coast
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So are talking a stock lift, say .430-.464 lift, with a longer duration than stock like a cheater cam?

Last edited by A/MP; 03/15/18 06:40 AM. Reason: typo
Re: STOCK HEAD W/BIGGER VALVES [Re: A/MP] #2466849
03/15/18 12:07 PM
03/15/18 12:07 PM
Joined: Jan 2003
Posts: 8,005
Tulsa OK
Bad340fish Offline
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I had some X heads that were lightly ported changed from 2.02 to 2.05 and it picked up .2 in the 1/2. This was on a 340 that was running mid 12s at the time.


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