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Post by MercuryMan on Apr 8, 2012 8:52:54 GMT -4
What would be a good starting point with regards to jet sizes for my 4150HP street 750cfm carb? I don't even know what size jets are in it yet. I'm pulling the engine tonight and rebuilding it ASAP.
468 cid BBF, forged flat tops, block is decked to piston height
Eagle SIR I-beam rods
D2 (PI) heads, ported, screw in studs, Manley valves (stock dimensions)
Comp cam (34-243-5), .574/.580 lift, 234/244 @ .050"
PRW stainless roller rockers, 1.7, 7/16" stud mount
Melling HV oil pump, ARP pump shaft
Cloyes double roller timing set
MSD-6AL, MSD coil and wires, re-curved duraspark distributor
PRW electric water pump
Offy port-o-sonic single plane intake with a 1" spacer
Holley 4150HP street carb
Hooker super comps, 2" primaries with 3.5" collectors
FRPP fox body oil pan swap kit
C6 trans with a 3500-3800 stall, foot brake for now.
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Post by Don @ Maritime Drag Racing on Apr 8, 2012 11:49:15 GMT -4
What would be a good starting point with regards to jet sizes for my 4150HP street 750cfm carb? Anything that makes a little black smoke......... |
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Post by MercuryMan on Apr 8, 2012 11:58:54 GMT -4
I hear ya....LOL.....I'm hoping to have it on the chassis dyno next month for a tune and run her through the paces to feel it out before opening weekend in Greenfield.
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Post by Bad Influence on Apr 9, 2012 7:00:41 GMT -4
In that 460 u got, I'd start with 78 front and 88 rear
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Post by ChipperChapman1090 on Apr 9, 2012 20:46:22 GMT -4
78's all around work well in 454's
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Post by MercuryMan on Apr 9, 2012 23:01:03 GMT -4
In that 460 u got, I'd start with 78 front and 88 rear I had a 750 DP with a Proform main body on my 351W in the Merc, it ended up with 78/82's on the dyno. I took the engine apart last night to get the block bored and the crank turned, looks like it will need to go .060" over, I found some pits in #4 that I knew would be there but they might come out at .060 over. It's .040 over now. The block was supposedly decked to piston height but it was also supposed to have flat top's which it didn't so it needs the deck height checked before I order my rods and pistons.  I'm dropping it off tomorrow for the machine work. Time to git'r done! ;D |
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Post by MercuryMan on Jun 4, 2012 22:56:23 GMT -4
I finally got around to prepping the carb. It had 75 fronts, 80 in the rear. The rear power valve was already plugged. The front power valve was a 5. I put in 78/88's, jet extensions and notched floats. Hopefully this will make the carb rich enough to start out with.
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Post by mario428 on Jun 5, 2012 7:49:35 GMT -4
www.holley.com/data/TechService/Technical/Carb%20Numerical%20Listing.pdfLook up your carb on the list in the link above, note the dash number if there. Go 2 steps richer max and possibly a lower number power valve depending on vacumn level. Contrary to what seems to be popular belief sometimes the people at Holly actually know what they are doing. Any carb that I had that worked reasonably well and was the right size for the engine always ended up within 2-3 sizes of what Holley put in for jets.
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Post by MercuryMan on Jun 5, 2012 9:08:24 GMT -4
The carb was on a 302, never run on my 468. I have a jet kit here now so we can play with it. I ws told to go up about 10 sizes over stock with a plugged rear power valve. Stock these came with 72's on the front and 78's on the rear from what the holley tech guy told me. My 351w ended up with 78/82 after the trip to the dyno with basically the same carb.
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I'm dropping it off tomorrow for the machine work. Time to git'r done! ;D