New guy with 383 and cam questions
06-22-2020, 02:48 PM
#21
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i like a lot of your design but I do have a suggestion. I'd recommend bigger intake runners. I'd do 195s to 215s. Your boat will take off fine even with the lessened low end of the big runner heads. it's a lighter 20 footer. A 383 will spin up so far you won't be able to keep it wide open. You are going to have to learn to drive it at scary fast speeds
I think you ought to look into external hydraulic steering.
I think you ought to look into external hydraulic steering.
As far as driving scary fast speeds I don't plan to keep it WOT across the lake. Although you never know. I don't want to kill myself.
- 185cc intake runner/ 62cc exhaust runner
- 72cc combustion chambers
- 2.02 intake/1.60 exhaust stainless steel valves
- 5 angle valve seat cut
- Double drilled intake mounting for either standard 12 bolt GM intake or late model 8 bolt Vortec intake
- Accepts both perimeter or center bolt valve covers
- Fits 5.7 & 6.2L small block GM V-8 applications
- Cast Iron
- Corrosion resistance heavy-duty cast iron castings suitable for saltwater usage
06-22-2020, 02:54 PM
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Those are EQ (Engine Quest) cylinder heads. You can get them from many places including engine builders, which I’d suggest you do so you know the valve springs are set up right snd valve job done correctly. Also guide clearance of course.
Last edited by SB; 06-22-2020 at 03:04 PM.
06-22-2020, 03:24 PM
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I'll 2nd or 3rd that XM 270 HR cam as it is very nice grind indeed. It's good for avoiding reversion, has lots of torque and idles extremely well. Go with the roller, you won't be sorry. I've used it in a small block stroker 383 and big block stroker 496 with great results. The lifters get a little pricey but you can't go wrong. If you need good cam recommendations ask for Gabby at Comp and he'll take care of you.
06-22-2020, 05:49 PM
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06-23-2020, 07:55 PM
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06-23-2020, 09:02 PM
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06-24-2020, 11:20 AM
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▲▲▲▲▲▲▲▲▲▲ Yeah how fast did that go? I'm not trying to push my family boat to 80MPH. haha
Rotating assembly will be here tomorrow! I was going to order my cam today. XM270 but Scat said since its a 383 it has to be a smaller diameter cam or custom ground or #2 and maybe #6 main caps I think they said would hit. Is this common with a 383? My machine shop asked me to check before ordering my cam. Anyway comp cams said they will do that so I am waiting on a call back from the tech there I spoke to.
Rotating assembly will be here tomorrow! I was going to order my cam today. XM270 but Scat said since its a 383 it has to be a smaller diameter cam or custom ground or #2 and maybe #6 main caps I think they said would hit. Is this common with a 383? My machine shop asked me to check before ordering my cam. Anyway comp cams said they will do that so I am waiting on a call back from the tech there I spoke to.
06-24-2020, 11:33 AM
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Yes, on 383’s because the extra stroke Hits rod bolts, yes, for many rod designs. You can either get rods that don’t do this or get reduced base circle cam. Make sure your engine machine shop advises you on this, which it sounds they sre doing.
