bbc 1.7 rocker arms
 

I know every one recommends crane for rockers. Im getting to the end of my build, is there a cost effective but strong roller rocker that anyone recommends for a +/- 500HP 454?
If i do go with crane can i use my stock guide plates?

BEWARE of Crane these days. I just bought a set of their Gold Rockers for my 500 EFI as a few of mine were bad and they were factory. The set I got from Summit was terrible (not their fault). The roller tips were notchy at best, and the oilers that are fed by the pushrod tip faced any which direction they felt like. Some shot straight down the rocker, others would shoot oil straight at the side of the rocker. TERRIBLE

Get the Scorpion Endurance Marine lifters. This is what Merc now uses in the blue motors.. I'm running them in my engine and am very happy with them.

Stock GM guide plates should work fine as long as the slots are correct for the puush rods.. That is what is on Merc engines.

I have been running Scorpions for 10 years. I bought a new set last year off ebay.
http://shop.ebay.com/?_from=R40&_trk...All-Categories

These rockers have over 100hrs on them in my partners 598 airboat engine. I am not sure of the brand but look identical to the scorpions (the builder was suppose to use scorpions, but will not give him a build sheet on anything on the motor). The standard guide plates showed signs of wear with one failing. We replaced them with the Dart adjustable guide plate that allow you to adjust the rockers in perfect alignment with the valves. We just got them installed yesterday and ops checked. He is using these with chm pro pushrods.

Sorry - i can not figure out how to post pics

I am using the Comp cams magnum rockers on my zz502 with a 1.72 ratio adn xr288hr comp cams on my airboat. Not a radical lift cam or high lift like my partners

well i place it in my gallery:

http://www.offshoreonly.com/gallery/...3&limit=recent

here is a link on the guide plates:
http://www.competitionproducts.com/D...info/27001230/

i have used harland/sharpe before and they work well.they are priced right,around 240.00 or so.only problem i have encountered are the arms are kinda chunky and might have to be filed alittle to clear some valve covers.

I have been using the Comp Cams pro magnum rockers, very good luck with them. I would use oversize pushrods, in that case you need oversize guideplates.

anybody ever use ohio crankshaft roller rockers? i'm looking for roller rockers also, price seems decent, but i havent heard much about them either good or bad?

The Scorpions that I listed are $313.00. I wouldn't buy a certain brand because they are cheaper. If one of these rockers fall apart and the ball bearings get into the engine your going to be out way more than a few bucks saved from some off brand. I'm pretty sure military specs on marine engines is 500 hours, I could be wrong but I think thats what I was told. These are the rockers used in all the gas inboard engines used by the military as well as all of Merc's blue engines. Remember you get what you pay for!

Scorpians look like the way to go for $250, THERE IS A SET OF GOLD NO NAMES GOING FOR 140 SHIPPED MUST BE CHINESE.
Theres also a set of Procomp for around $150 on ebay, anyone aware of this brand, i know they sell truck tires..

LOL ITS LIKE TOILET PAPER, YOU GO WITH THE CHEAP **** AND YOUR ASS HURTS FOR A WEEK

Stay away from pro-comp, China
I just ordered another set of Scorpions. I replaced one engines last year. I run the 1.7's on the exhaust and 1.8's on the intakes. These are at least 10years old and I think it is time to replace them. I paid $234 from Summit I also ordered some Dart adjustable push rod guides.

These are the ones that I'm running. Nice looking engine there Rookie!

I thought Crane went bankrupt and closed down, but it turns out it must have just been Chapter 11 cause they are still in business.

If anyone needs a set of Scorpions 1.8 ratio like new I have a set for sale.

I love engine porn in the morning - lol

We placed the Dart adjustable guide plates on my buddies airboat engine this weekend. Nice high quality part where the 90 degree bends were broke with a radius die to increase strength versus the factory guides formed with a knife die incresing the stress in the break. Guess where the factory one failed

I was looking at the Harland Sharp 1.8's what do you want for the Scorpions?

How does the rpm Air Gap work with 500 Hp? Is it to much manifold?

You running an Air Gap or a Weiand stealth?

I'm running a stealth, I like it better than the Air Gap. IMO its a nice compromise between a traditional dual plane and a single plane plus its operating range fits my engine perfectly. I was thinking about trying a single plane but Dave at Wesco said I was splitting hairs and to call it good. Aren't you running the stealth as well?

Yes, I am also running Stealths. JimV also likes the Stealth from back in the old B class days same compromise that you stated. I have the floors on my Stealth welded up to match the wedges in my heads. These will still match Jims new Dart Marine Heads that I hopefully will have together in the next few weeks. can't wait to see how they perform.

Pantera232, sorry for the side track.

I believe a carb'd 500HP came with a Dart single plane. So I do not think the Air Gap is to much intake.