455 buick questions

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90chevy396
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455 buick questions

Post by 90chevy396 » Mon Mar 30, 2015 11:42 am

currently running a buick with custom cam and minor other upgrades like an offenhouser intake and minor tune internally but turning a stump puller @ 18 degrees 2700 curious if I am choking it down or what
Last edited by 90chevy396 on Tue Mar 31, 2015 3:25 pm, edited 1 time in total.
13' LASER W/455 BUICK DD SINGLE FRONT DOUBLE REAR WHIRL WIND PROPELLER

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Re: what is the highest rpm a stock 455 buick will handle?

Post by Joe » Mon Mar 30, 2015 11:56 am

Love them Ole buicks,sure miss mine sometimes. If it was put together right you should have no problem with 3-3300 in DD but no need to go past 3000 unless your racing. If you put a box on it you won't want to turn it past 4500 stock.
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Re: what is the highest rpm a stock 455 buick will handle?

Post by 90chevy396 » Mon Mar 30, 2015 12:23 pm

I have been doing a bunch of searching on google and a lot of people are saying 5500 stock and the bottom end will handle 650hp but the rocker bolts are a common failure. just wanted some good airboating experienced knowledge for my advice. what rpm does the stump puller like and am I choking the motor down too much at 2700 and 18 degrees
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Re: what is the highest rpm a stock 455 buick will handle?

Post by Joe » Mon Mar 30, 2015 12:50 pm

I dont know the stump puller but 2700 isnt choking a buick to much. I think you may be leaving a bit on the table with those 300 rpm but if it runs good leave it be.
I've spent a pile of money on buicks trying to make them live long with a gear box and I needed another pile to make it happen. You have to run forged pistons dont run hypereutectic and you will have to upgrade the rockers to a shaft roller system. They will eat cast pistons at 5500 max. It will do it without the upgrades but it won't live long. There great motors but cost a lot of money to build and make live. I gave up and went to a BBC and havnt looked back. If you havnt found them yet check out TA perormance. There all about the buick and have every performance part you could ever want
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90chevy396
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Re: what is the highest rpm a stock 455 buick will handle?

Post by 90chevy396 » Mon Mar 30, 2015 2:41 pm

I was reading on a forum about the old buicks and everyone talked about TAPERFORMANCE.COM. boat runs pretty good its a 13'6"x7'6" with single front and double rear and with at least 1000lbs on board I can run about 150 yards on dirt road before she looses momentum. then I have to loose at least 250lbs to get going again. also Saturday I ran the engine up on the trailer and only got 26050 to 2700 and looked at the rear butterflies not opening up. its a holley 650 vaccum secondary I believe. should the secondary's be pulling in at WOT under load on the trailer? tried to open them and watch the tack but couldn't do both but engine sounded the same with or without the secondary's. how much cfm should the engine draw around 3000rpm max.

once again been around airboats my whole life but never actually maintaining and tuning one any help is appreciated. knowledge I am looking for is buick specific not just any gm engine

anyone with good knowledge of the stump pullers know what the props favorite rpm is for running ground in general not looking for exact numbers because I know their are so many variables to facture in
13' LASER W/455 BUICK DD SINGLE FRONT DOUBLE REAR WHIRL WIND PROPELLER

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Re: what is the highest rpm a stock 455 buick will handle?

Post by Joe » Mon Mar 30, 2015 3:41 pm

The 650 is to small. Yes the secondaries should be open. The 455 buick came factory with an 850 q jet. I had Damn good luck with the edelbrock 750 on my buick when it was DD.
Call whirl wind about your prop. They are real nice and no better person to ask the the ones who make it.
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Re: what is the highest rpm a stock 455 buick will handle?

Post by SWAMPHUNTER45 » Mon Mar 30, 2015 7:03 pm

The 650 AVS from Edelbrock is the perfect DIRECT DRIVE carb.

No need to go bigger, it wont pull the CFM.

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Re: what is the highest rpm a stock 455 buick will handle?

Post by Joe » Mon Mar 30, 2015 7:29 pm

A 650 is nowhere near enough carb for a buick 455. DD or gear box. I've ran a 500 a 650 a 750 and an 850 on a DD buick 455 and hands down the 750 worked best for the DD.
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Re: what is the highest rpm a stock 455 buick will handle?

Post by pontoon outlaw » Mon Mar 30, 2015 8:22 pm

What length of the stump puller? I find it hard to believe it is on 18 degrees? I have mine on 20 with the Roberts Box 1.71 to one or it's 1.51 to one and the Cad 507 turns 4500, at WOT, mine is a 76 inch whirlwind stump puller, and when I was running DD it was on like 3 degrees!!!!!!!

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Re: what is the highest rpm a stock 455 buick will handle?

Post by 90chevy396 » Tue Mar 31, 2015 12:07 pm

on the hub it is marked 18 degrees and its a 72 I don't have a protractor to check realistic numbers just going on what the back of the hub states. I think my neighbor has a electric protractor for his new ngq I will see if I can get it on my prop in the next week or so. that way I have accurate numbers for you pontoon. once again rookie when it comes to mechanics of an airboat. only having a couple hundred hours stick time but a lifetime of seat time on various airboats.
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Re: 455 buick questions

Post by pontoon outlaw » Tue Mar 31, 2015 6:33 pm

:cheers: 10 4 Jeff, Derrick has that same motor and he is running it with the same Box I do, and it's on a BIG Hull and that thing goes pretty much anywhere he wants to go :thumbleft:

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Re: 455 buick questions

Post by sidejobs » Tue Mar 31, 2015 8:39 pm

My stump puller liked 3000 rpm the best.
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Re: 455 buick questions

Post by sidejobs » Tue Mar 31, 2015 8:41 pm

And for the record I had mine cut to 70" and had a lot of pitch in it. It was a bad mofo
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Re: 455 buick questions

Post by Jimmy M. » Tue Mar 31, 2015 10:15 pm

X2 on 3000 rpms with the Stump Puller. I ran a 72" on my 500 caddy. Set it at 2600 at first and it was OK but didn't run dry all that good. Set it to 3000 and it was like a different boat. Ran much stronger.
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Re: 455 buick questions

Post by 90chevy396 » Wed Apr 01, 2015 12:41 pm

With the secondary's not pulling in I have a few items to check. so when I get back from vacation off to the drawing board for compression check among testing back up carb given with boat ( rebuilt for a back up not just a spare lying around) appreciate all the suggestions guys and don't count out anyone info definitely going to keep all info in mind when diagnosing next week. until then slide safe my newfound friends.
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Re: 455 buick questions

Post by 90chevy396 » Fri Oct 16, 2015 1:39 pm

well here it is during hunting season again and kids sporting events kept me from doing any intensive work on the boat. found the dist was only advancing to 22 degrees and only gaining 6 degrees mechanical advance. removed dist and modified cam plate to allow 20 degrees of mechanical advance and set full advance at 32 degrees. gained 150 rpms now the boat turns 2700-2750. still big improvement. carb found to be a 600cfm vaccum secondary. installed back up carb with choke tower ground off and boat jumped up and had plenty of power but was run lean and had issues cruising lean. since rebuilt carb that came on the boat that had 75 jets and boat ran normal again @ 2700. installed 72 jets and still runs great decent throttle response and egts under 480 with a minor puff out the tail pipe under acceleration. so now even running dry through 5'-6' of sawgrass still able to move along @2000-2100 with the occasional wot in bad spots. will be trying out bigger carb and other remedies mentioned after hunting season. and the blades are set at 8 degrees when measured with a digital level @ 2700 when I backed off to 6 degrees and turned 2800 I lost a lot of push with 650lbs on board. put back at 8 degrees and back down t 2700 rpms and the push is back, so off to hunting for now any further ideas guys
13' LASER W/455 BUICK DD SINGLE FRONT DOUBLE REAR WHIRL WIND PROPELLER

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