Crazy eyes Posted November 28, 2007 Share Posted November 28, 2007 Ok well my project has started,it is quite a weird one. The car is a '89 Nissan 240sx,the bottom end is a 351w. The plans are 351w block, 400m crank,Forged rods(4.00" throw)Forged .030 over pistons to complete the bottom end. Now the heads are going to be Ls1 heads, Yes Ls1 heads. They fit on sbf blocks with a little work on the headbolt holes. The reason I am going for this instead of some after sbf aluminum heads is because I picked these up from a buddy of mine who went to aftermarket heads on his ls1 and sold me these for 75.00 dollars.The cam is going to have to be a custom grind because the valves on the ls1 heads are reversed from a Ford.We are making a custom sheet metal intake with individual runners to a single plenum. To help it breath I am going to use a stock Lightning TB which I am getting for free from a buddy who just upgraded to a BBK but the stock ones flow over 1000cfm. As far as the wiring goes I think I am going to run a early 302 speed density computer and harness and run a tweecer piggyback program for tuning issues. I will post some pictures as soon as the motor is in car. Quote Link to comment Share on other sites More sharing options...
mark Posted November 28, 2007 Share Posted November 28, 2007 What kind of compression will you be running? How similar in size are the combustion chambers? Quote Link to comment Share on other sites More sharing options...
Gareth Posted November 28, 2007 Share Posted November 28, 2007 Not only is it the car going to be a hybrid, but the engine itselft will be a strange Blue Oval/Bowtie hybrid... This is true HybridZ spirit - affordable solutions for making your car go scary fast! I'll keep my fingers crossed. Quote Link to comment Share on other sites More sharing options...
Crazy eyes Posted November 28, 2007 Author Share Posted November 28, 2007 Well I know that the Ls1's have 10.1:1 compression,but I am not sure how much it will have,As far as everything lining up it is dead on.The rockers are dead aswell as the water passages are spot on,It came when we bought the ls1 heads,and my friend has a 302 apart and we put the HG to the bottom of the head and EVERYTHING lines up,I just called Camotion and they said for a custom grind cam it's going to run 700.00. Quote Link to comment Share on other sites More sharing options...
blueovalz Posted November 29, 2007 Share Posted November 29, 2007 Take lots of photos and document the process, 'cause this one's good! Just last night I was looking at the history of the LS1 heads, their flow, and some other data, and was very impressed with everything I read. Quote Link to comment Share on other sites More sharing options...
jbk240z Posted November 29, 2007 Share Posted November 29, 2007 To make a ford run , you gotta use LS1 GM heads! I can't believe the heads will fit. Quote Link to comment Share on other sites More sharing options...
Gollum Posted November 29, 2007 Share Posted November 29, 2007 I really would like to know how much modification that's really gonna require, and how similar in shape the water passages are. Might actually be a very interesting swap to look into as used LS1 heads can be much easier to come by than good aftermarket heads for a SBF. What are you gonna run for an intake and exhaust? Quote Link to comment Share on other sites More sharing options...
Crazy eyes Posted November 30, 2007 Author Share Posted November 30, 2007 The intake is going to be a custom sheet metal intake with single runners up to a single plenum.And for the exhaust I am going to have run Ls1 headers,I am probably going to have to run block huggers to clear. Quote Link to comment Share on other sites More sharing options...
z383z Posted December 1, 2007 Share Posted December 1, 2007 What LS1 head casting were you planning on using? Would it be possible for you to post pictures of your ford short block with an LS1 head gasket on it so we can all see how coolant passages, and head bolt holes would line up? Thanks in advance. I was also wondering if you know the dish volume of your pistons. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted December 2, 2007 Share Posted December 2, 2007 Interesting. How do the headbolt holes line up? Also... the pushrod guides and rocker arms are placed the same? Quote Link to comment Share on other sites More sharing options...
blueovalz Posted December 2, 2007 Share Posted December 2, 2007 I was looking at bore spacing, and the LS series has a .020" wider bore spacing. I can see where their may need so tweaking here. Photos would be appreciated. Quote Link to comment Share on other sites More sharing options...
Crazy eyes Posted December 4, 2007 Author Share Posted December 4, 2007 Sorry for not posting any pictures,my cable internet has been down so I am stuck with 56k for awhile.Also the headgasket that we were using was a .030 over HG.As for the headbolts they line up perfect but on the intake side the holes need to be grinded to make a little bigger.And yes the pushrod and lifters are dead on aswell. The only thing is where the 302 has oil passages,the ls1 heads are going to just dump the oil into the valley,but there are plenty of holes for the oil to drain back into the block. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted December 4, 2007 Share Posted December 4, 2007 Thats amazing, surprised no one thought of this sooner. It is good for people with old Fox's who can't afford an LS complete, but the custom grind is a pain I bet. Quote Link to comment Share on other sites More sharing options...
Top Secret Posted December 5, 2007 Share Posted December 5, 2007 Thats amazing, surprised no one thought of this sooner. It is good for people with old Fox's who can't afford an LS complete, but the custom grind is a pain I bet. It's been done before on mustangforums.com And you STOLE those heads for 75 dollars. While I commend you for what you're trying to do, seriously, just sell the heads for a wad of cash and put it towards some SBF heads. Unless ofcourse you're going for that "Are you serious?" factor. Quote Link to comment Share on other sites More sharing options...
zgeezer Posted December 7, 2007 Share Posted December 7, 2007 Sorry for not posting any pictures,my cable internet has been down so I am stuck with 56k for awhile.Also the headgasket that we were using was a .030 over HG.As for the headbolts they line up perfect but on the intake side the holes need to be grinded to make a little bigger.And yes the pushrod and lifters are dead on as well. The only thing is where the 302 has oil passages,the ls1 heads are going to just dump the oil into the valley,but there are plenty of holes for the oil to drain back into the block. Here's a guy that posted pictures of this head swap. This is real hot rodding and thinking "outside the box". http://460ford.com/viewtopic.php?p=138256 g Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted December 7, 2007 Share Posted December 7, 2007 Why do you need to run a custom cam out of curiosity? Quote Link to comment Share on other sites More sharing options...
Pete84 Posted December 7, 2007 Share Posted December 7, 2007 Why do you need to run a custom cam out of curiosity? IIRC, the intake and and exhaust valves are switched from LS1 to SBF. Quote Link to comment Share on other sites More sharing options...
Gollum Posted December 7, 2007 Share Posted December 7, 2007 Because the LS series and the SBF have reverse valve arrangements. So there's an exhaust lobe on the SBF cam where there's an intake valve. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted December 7, 2007 Share Posted December 7, 2007 Oh, okay. Got it. So the custom cam would be whatever normal SBF cam you wanted, then tell them to switch the intake and exhaust lobes? Is that true for every port? Quote Link to comment Share on other sites More sharing options...
Gollum Posted December 7, 2007 Share Posted December 7, 2007 You know, some of the cam details still make me wonder... ...would it be ideal to run a LS1 type profile cam designed to fit a SBF block, or run a SBF type profile came in a reverse lobe in order to fit the LS head? But it looks like this custom cam won't be cheap, but not a deal breaker. If you really do score the heads for less than $100, and you fab your own intake or use spaces to fit a junkyard intake you might be able to do the whole thing for less than $1k, which is still cheaper than most aftermarket heads, and this combo should flow pretty well. Guess we'll have to wait and see, but it'd sure be wicked to see 350+na hp out of this combo. In the previously linked thread they talked about the pistons needing to have valve reliefs grinded into them. I'd kinda like to know what the CC difference of the heads are and how much clearence would need to be made to accomdate a high lift cam. Though I might be on my own for finding out. Quote Link to comment Share on other sites More sharing options...
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