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'72 mustang 
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Joined: July-13-2005 Location: United States Status: Offline Points: 35 |
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 Topic: cylinder head installPosted: July-29-2005 at 2:56pm |
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I am getting my heads back from the machine shop today and am getting ready to put the engine back together. I have 302 heads on a 351 block. Anyone know which torque specifications I should use, 302 or 351? Any other helpful hints are apprreciated as well. Thanks.
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72 CC mustang
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3363 |
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Posted: July-29-2005 at 4:48pm |
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351...
The shop opened up the bolt holes to 1/2", right? |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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Siveck
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Joined: March-14-2005 Location: Birmingham, AL Status: Offline Points: 100 |
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Posted: July-29-2005 at 5:13pm |
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The torque specification is in relation to the diameter size of the bolt. Being that you are using the bolts for a 351 (larger size than 302 bolts possibly), then you should use the 351 specification.
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1975 Ski Nautique
"Small Letter Boat" |
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'72 mustang
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Joined: July-13-2005 Location: United States Status: Offline Points: 35 |
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Posted: July-29-2005 at 6:24pm |
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Yeah, the head bolts are 1/2" diameter. Thanks guys.
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72 CC mustang
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64 Skier
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Joined: February-08-2004 Location: United States Status: Offline Points: 415 |
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Posted: August-01-2005 at 11:09am |
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50 then 60 then 75 ft-lbs.
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3363 |
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Posted: August-01-2005 at 6:10pm |
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finish @ 90-100-112 for a 351.
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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captan1
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Joined: June-02-2004 Location: United States Status: Offline Points: 180 |
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Posted: August-01-2005 at 8:33pm |
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Did we get GT40P heads off an Explorer, and new bolts?
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Jim_In_Houston
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Joined: September-06-2004 Location: United States Status: Offline Points: 1120 |
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Posted: August-01-2005 at 11:19pm |
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Yes we did.
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Happy owner of a '66 and a '68 Mustang
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64 Skier
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Posted: August-02-2005 at 11:08am |
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Sorry....had 302 on the brain....Gotta Ski is correct on the torque.
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captan1
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Posted: August-02-2005 at 1:33pm |
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I love my gt40p heads. Jim, have you installed the heads yet? I think I'd do that again if I bought another boat.
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reidp
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Joined: December-06-2003 Location: Mooresville, NC Status: Offline Points: 1804 |
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Posted: August-03-2005 at 12:36am |
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Hey, since '72 Mustang didn't reply after the good info, is it possible that he meant to say 351 heads on a 302? Most all of the 4V Ford powered Mustangs of that '71-76 or so vintage were 302's with 351 heads as part of the Ford factory supplied marine long block package. This also included the 351 cam and firing order as did later models.
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Jim_In_Houston
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Posted: August-03-2005 at 1:36am |
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Yes, I install my GT40Ps on my '68 with a 289. I'm happy with them. I know that any lack of performanc is not due to flow restriction. I run up to about 5500 RPM at about 48MPH (with no head wind).. Fast enough for that old hull imho.
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Happy owner of a '66 and a '68 Mustang
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reid
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Posted: August-03-2005 at 12:20pm |
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Jim,
Is this the engine with the Speed Pro cam? If so, you could probably gain some speed and most definitely fuel economy if you brought the rpms back down to 5000-5200. When I've run a Fed 12x13 prop with the similar engine combo, I would turn about 5500 but lost about 2 mph, compared to 5200 with a 12x14 Fed. |
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reidp
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Posted: August-03-2005 at 12:21pm |
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I guess I didn't log in correctly or something on that last post.
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reidp
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Posted: August-03-2005 at 12:23pm |
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You'd think by now I'd have this figured out. Sorry.
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'72 mustang
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Posted: August-03-2005 at 1:59pm |
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Hey guys, sorry I didn't reply sooner. Got confused with two different torque specs and the GT40P talk. Anyways I just got the boat and already had to tear into to it(seller left out part about blown head gaskets), but it is a 351 going by the half inch diameter head bolts (and the 351 casting in the valley) and they are 302 heads. I went with the torque specs out of the book for a 351 since those are the bolts I used. I appreciate you guys helping me out. Are these valve adjustable or do I just tighten all the way down? Thanks again.
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72 CC mustang
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Jim_In_Houston
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Posted: August-03-2005 at 11:43pm |
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Yeh Reid. I installed the SpeedPro cam. I am very happy with it too. I have learned to control myself and seldom run over 4500RPMs, (unless some kid in a shiny new boat tries to pass).
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Happy owner of a '66 and a '68 Mustang
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captan1
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Posted: August-04-2005 at 1:25pm |
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Here's the website for the cam spec's
http://engineparts.com/motorhead/techstuff/2003marine/Camshafts_Lifters_TimingComponents.pdf |
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Bob's2001
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Posted: August-06-2005 at 6:06pm |
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If the heads have the original pedestal rockers they are not adjustable.
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Bob Ed
83 2001 |
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'72 mustang
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Posted: August-08-2005 at 2:53pm |
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Thanks, Bob's2001
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72 CC mustang
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