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Silverton Yacht Convertible All Silverton Yacht Convertible Models From 31 to 50 Over Years - 1977 to Present

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  #1  
Old 09-06-2011, 09:37 AM
25thmustang 25thmustang is offline
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Default 1985 Silverton 34C repower performance?

This past weekend I went and checked out a 1985 Silverton 34C. The boat was listed as having 454s, but I expected to see small blocks. Upon opening the hatches, the motors were truly Crusader model 350, 454s. I was a bit amazed they fit, but they appeared to fit reletively well. It was noted that the props were changed to accomodate the 454s, but the shafts and rudders looked original. I'm unsure on the transmissions.

My question would be in regards to potential performance. The current owner wasn't able to give me cruise and top speeds, but did say the motors run right to 4500 RPM (about where they should be).

I understand this boat is probably one of only a few big block mid '80s 34'ers, but I was hoping someone may have one on here, or know of one that could shed some light on the boats performance.

Thanks in advance.

Brian (hopefully a Silverton owner, once the Cruisers Inc sells.)
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Old 09-08-2011, 11:29 AM
souldeep souldeep is offline
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I saw one for sale on Craig's List awhile back and I believe it had 454's, I thought thats what they all came with, I'm just guessing though... What do all of the one's on Boattrader/Yachttrader have?
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1977 31' Sedan "Fool's Paradise"
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Old 09-08-2011, 03:50 PM
25thmustang 25thmustang is offline
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Of the boats I have been looking at, it appears the late 70's to early 80s boats had either 360 Chryslers, or 350 Chevys. The mid 80s boats were all 350 (270hp) Crusaders.

The 1989+ boats I believe came with big block 454s, but these are the "newer style". I have never seen or heard of a 1983-1988 boat with big blocks, until now. I was almost 100% sure I was going to pop the hatches and see small blocks, but to my shock they were truly 454s. Although the weight goes up, I have to imagine the step up from 270hp ea, to 350hp ea (from 540 to 700 total) with a lot more torque, should power this boat very well.

souldeep, are you in the New England area? If so it might have been the boat I looked at. I would love to get my express sold, and make an offer on a boat or two I have seen.
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Old 09-09-2011, 12:12 PM
souldeep souldeep is offline
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Sorry, I look at so many boats they sometimes run together. I am actually in Florida. The boat should be a beast with the big blocks but I would worry about the trannies with all that torque (if they are original).
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Old 09-12-2011, 01:51 PM
25thmustang 25thmustang is offline
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Ok, then it would appear to be a different boat, as this one is up on the South shore of Bostom harbor.

I agree that the boat should run well, but will need to pry more on the transmissions, and running gear that was changed when the engines were done. The props were changed, but to my knowledge not when the repower was done, but after. This leads me to believe the transmissions and shafts are original small block spec.
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Old 09-12-2011, 02:45 PM
actthree actthree is offline
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I think you'll find that the 85 Silverton 34C has 1-1/4" shafts. With a potential for 350 hp, I'd be more comfortable with 1-3/8" shafts but I know at least one person who re-powered a 1980 Silverton 34C with 454s on the 1-1/4" shafts and hasn't had any trouble.

The other part of the drive line equation is the transmission. If the 34C you are looking at has 72C Velvet Drive transmissions (probably approximately 1.5:1 reduction ratio), I'd think that would also work because many of the later 454 powered boats used that transmission.

Bill
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Old 09-12-2011, 05:20 PM
25thmustang 25thmustang is offline
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Would a straight shaft boat have the 72C Velvet Drive? I guess the question would be, what did a stock 1985 34C with small blocks have for a transmission and shaft?

The person who did the repower on the 1980 mentioned, how did the boats performance increase, and did the fuel economy (if you can even use that word) decrease by a lot?
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Old 09-12-2011, 06:24 PM
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34C 34C is offline
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Brian-
My '84 has the original (rebuilt) straight-shaft Velvet drives. I don't have the exact model# available at the moment but they are definitely not 72C's. As I recall, they are model 10-XX (not sure about the last 2 digits).
I plan to be onboard this weekend so I'll check if you want.
I even have one of the rebuild invoices here and - of course- they don't mention the model #. Figures!
It DOES say the ratio is 1.91:1.
BTW- we've PM'ed each other on that 'other' forum..... Good luck with your search!
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Last edited by 34C : 09-12-2011 at 06:28 PM.
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Old 09-12-2011, 09:51 PM
25thmustang 25thmustang is offline
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Yes 34C that's what directed me here.

I would be interested in knowing the actual transmission, ratio and shaft size to try and do some research on the boats motor swap.
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  #10  
Old 12-18-2012, 08:15 PM
capt art capt art is offline
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Default 34c mtrs

I have a34 convertable, She has chrysler 318`s 1980
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