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Bulldog cam problem
Hello,can anyone help with info on the cam for my Bulldog,the cam I have is a crane cam that was bought some years ago,don't have the original anymore. the problem is when its in place with the sprocket bolted on, the lobes are so far out of line that they are close to touching the adjacent lifter, the number on the cam(although very hard to read)is I think H240329 134802 the casting number for the engine block is GM 14044807.
MANY THANKS FOR ANY HELP WITH THIS. |
Do you have a cam card with that cam ? I looked it up and cant find any info on it
That should be a mark iv bowtie tall deck block. What timing are you using? Something seems off . |
if it is a flat tappet cam this is pretty normal,it helps in spinning the lifter in the bore so the face of the lifter doe,s not go flat and ruin the cam.
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I thought the Bulldog's used the same cam as the carbed HP500 which would be a roller.
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In my notes;
Originally Posted by MarineKinetics
]The Merc Bulldog is an exceptional platform for upgrades. Many of these were contracted to the military, hence the overkill on the hard parts. Below are the specs on the engine.
541.9 CID GM MK 4 tall deck (cast# 14044807) Block clearance to accommodate 4.375” stroke Siamese Bore, reinforced decks with blind head bolt holes. Deck 10.2” 2 pc rear seal Bore 4.44” Stroke 4.375” (With a factory recommended bore range 4.250’- 4.560” there is plenty of room for upgrades) SCR 8.6:1 4340 Lunati crank Piston is Wiseco (Merc part #) Connecting rod is Manley +.400" / 6.535" Dart Single Plane Intake Manifold Crane Camshaft Specification Card Part Number: 13H000036 Grind Number: H-240/329-2-10 T1.2 The cam rates on a 110*LSA, 5* advance Lift .329” Lobe .559” Valve Lift .340” Lobe .578” Valve Specs: @.0042" ................Opens..........Closes............. C/L...........Duration Intake.....43.0 BTDC.....77.0 ABDC......105*..........300 ° Exhaust...88.0 BBDC.....42.0 ATDC......115*..........310 ° 85* overlap @.050" ................Opens...........Closes...........C/L.........Duration Intake.....15.0 BTDC.....45.0 ABDC.....105*.........240 ° Exhaust...60.0 BBDC.....10.0 ATDC.....115*.........250 ° Camshaft Is Ground with .0012" Lobe Taper Bob |
Originally Posted by ENGLAND DAVE
(Post 4385731)
the lobes are so far out of line that they are close to touching the adjacent lifter
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Originally Posted by Griff
(Post 4385774)
I thought the Bulldog's used the same cam as the carbed HP500 which would be a roller.
I think it was the same as the HP465 cam which was a flat tappet hyd |
Originally Posted by Griff
(Post 4385822)
Disregard that.
I think it was the same as the HP465 cam which was a flat tappet hyd |
Originally Posted by Budman II
(Post 4385797)
Is it a problem with the cam walking forward due to the cam button / retainer?
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Do you have a cam card for this camshaft with some specs on it? I can't find any info on that grind #.
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Originally Posted by MILD THUNDER
(Post 4385857)
Do you have a cam card for this camshaft with some specs on it? I can't find any info on that grind #.
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Thanks everyone, for all your reply's. I'm trying to find out more info at the moment, as I mentioned the replacement crane cam & lifters were sourced by a friend of mine quite a few years ago.I don't have any paper work for it,but the cam was to be just a like for like replacement for the original/stock one. the cam looks like it would be ok if it was spaced about 2mm forward, almost as if there is a spacer missing from behind the cam sprocket and the block.But all the info I can find is that the sprocket runs directly against the block.....
many thanks again to everyone who is trying to help. |
Check the cam bearing boss to value cover distance block could have been machined for a Torrington bearing setup
Or repaired to except a hardened shim.block may have been slightly damaged at one point in its life |
Crane roller cam upgrade was popular mod on a 30k motor that ran a relatively lame cam . I do believe that involved a torrington bearing . thats alot of cid valvetrain mass and potential spring pressure for a flat tappet these days . Even back in the day .
i think the orig hp575 based 540 ran solid at one time |
575sci, 600sc, 800sc, also ran flat tappets.
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