351 Mod Info

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   I'm getting set to put some GT40-P heads and an Edelbrock Performer manifold on my engine. The boat is quite a distance away and I'd like to have all the parts I need so that I can complete the work in a weekend and have the boat ready for skiing when the ice goes out. Right now the engine is in its stock form with the 240/250 HP  "E" heads and a Holley 4160 carb. My list of parts so far are the heads, manifold, gaskets/sealer, new head bolts, a shim kit for the rockers and a new longer fuel line. 

Anything else I should have ready to go to make the job a smooth one? I'm thinking about a 6.5 power valve. How about suggestions for carb jetting?  What about a metering block conversion kit for the secondary side. While I'm at it should I get the assortment pack with all of the jets? .....or does anyone have a good starting point to get things running fairly well....GottaSki??

I've been looking at other posts here but it seems the more I read, the more questions come up. 

Thanks in advance for any help.

Mark

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LaurelLakeSkier Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: February-12-2007 Location: Wisconsin Status: Offline Points: 485	Post Options Post Reply Quote LaurelLakeSkier Report Post Thanks(0) Quote Reply Topic: 351 Mod Info Posted: March-19-2007 at 7:25pm
	I'm getting set to put some GT40-P heads and an Edelbrock Performer manifold on my engine. The boat is quite a distance away and I'd like to have all the parts I need so that I can complete the work in a weekend and have the boat ready for skiing when the ice goes out. Right now the engine is in its stock form with the 240/250 HP "E" heads and a Holley 4160 carb. My list of parts so far are the heads, manifold, gaskets/sealer, new head bolts, a shim kit for the rockers and a new longer fuel line. Anything else I should have ready to go to make the job a smooth one? I'm thinking about a 6.5 power valve. How about suggestions for carb jetting? What about a metering block conversion kit for the secondary side. While I'm at it should I get the assortment pack with all of the jets? .....or does anyone have a good starting point to get things running fairly well....GottaSki?? I've been looking at other posts here but it seems the more I read, the more questions come up. Thanks in advance for any help. Mark

jbear Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-21-2005 Location: Lake Wales FL. Status: Offline Points: 8193	Post Options Post Reply Quote jbear Report Post Thanks(0) Quote Reply Posted: March-19-2007 at 8:21pm
	Just had the same thing done by my "pit crew". You will love the way your boat runs afterward. I really know nothing about what majic they worked but you can check out the thread "jbears 351". Lots of pics. Sorry I can't do a link like some of the computer skilled guys. My best suggestion? Find out what 79Nautique and Backfoot are doing for the weekend and fly them to where you are. Stand back when 79 gets near your boat. He goes right to work and knows what he is doing. The only thing I needed was a credit card and money for beer and pizza. We had a great time with MM, Blondie and ReidP as well. Hope it works out just as good for you. john
	"Loud pipes save lives" AdamT sez "I'm Canadian and a beaver lover myself"...

GottaSki Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: April-21-2005 Location: NE CT Status: Offline Points: 3363	Post Options Post Reply Quote GottaSki Report Post Thanks(0) Quote Reply Posted: March-19-2007 at 9:08pm
	For now just focus on getting it back together straight. Can't reliably suggest jets or other carb mods till you got the timing right on, the air screws optimized then do some plug chops and report its performance. Avoid extended WOT till the plug chops are done.
	"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole

TRBenj Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: June-29-2005 Location: NWCT Status: Online Points: 21186	Post Options Post Reply Quote TRBenj Report Post Thanks(0) Quote Reply Posted: March-20-2007 at 9:37am
	It certainly wouldnt hurt to pick up the metering block conversion- it will allow you to dial in the secondaries if re-jetting is necessary. Might want to consult Holly or Summit on the exact part number, as I was told theres a difference between the 600cfm and 750cfm kits. Get new carb gaskets for when it comes time to tune. I sprung for the jet assortment kit because it cost about the same as the jets I would have bought seperately (plus a lot more for possible future use). Came in a nice case too. I also picked up some timing tape. For misc parts, some 3m spray adhesive made it easier installing the gaskets. I also cut the heads off some bolts and used them to line up the intake manifold upon reinstallation. Some good scrapers and gasket remover (spray) made cleaning parts easier. Will you need any new brass plugs for the intake runners or water jackets on the new manifold? Make sure you have all the necessary gaskets- heads, intake, valve covers and spacer/carb. Some of the liquid gasket stuff is also helpful for the front and rear of the intake manifold. You may also want to raise your throttle cable bracket to make the throw level. I made my own out of a scrap piece of metal.

GottaSki Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: April-21-2005 Location: NE CT Status: Offline Points: 3363	Post Options Post Reply Quote GottaSki Report Post Thanks(0) Quote Reply Posted: March-20-2007 at 2:12pm
	Without a cam change, I suspect no serious jetting will be warranted; still check.
	"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole

LaurelLakeSkier Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: February-12-2007 Location: Wisconsin Status: Offline Points: 485	Post Options Post Reply Quote LaurelLakeSkier Report Post Thanks(0) Quote Reply Posted: March-20-2007 at 8:12pm
	Thanks.....a few addition to my parts order Tim. GottaSki, as suggested, I'll reassemble with existing carb set-up and then see where things stand. Any other suggestions welcomed and appreciated.

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