Offshoreonly.com - ARP main bolts vs studs 4 bolt mains

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Arp bolts will be more then enough with only 600hp. Like said before just make sure mains are on size after changing from factory bolts to the arp bolts and you will be good to go.

Hey thanks for all of your input guys! Friend of mine had a set of new studs for stock windage tray, so I scooped them up. Overkill but this way I can retain the tray and I got them for the cost of the ARP bolts.

Like was said just make sure they don't move the housing bore around. I've seen it many of times!!!

Thanks I will assure it does not move. Thanks for your input!

Quote:

Originally Posted by MILD THUNDER (Post 4014302)

no go with the stock windage tray. You'll need these from GM.

http://www.summitracing.com/parts/NAL-10224104/

I'd have no worries using the GM fasteners with a 4 bolt main block at 600HP, especially in a low rpm marine engine. If you told me you were building a 7000RPM deal, that's different. Overall,

Quote:

im not a fan of the Gen V blocks, but that's irrelevant.

I see mike got to you,,theirs nothing wrong with gen v blocks,,the gen 6 has less meat on them..come by and ill show you..

Yes at one point but I researched it further and found there's nothing wrong with the Gen V, it just got a bad rap for several reasons. My machinist also said to "stick with the gen v". Thanks for your input.

Quote:

Originally Posted by FIXX (Post 4016259)

I see mike got to you,,theirs nothing wrong with gen v blocks,,the gen 6 has less meat on them..come by and ill show you..

if you sonic check a gen 5 block you will find that the cylinder barrels are way thinner than a gen 6 block.this is just a fact.im not saying the gen 5 block is junk,but they cannot be bored past .060 over.4.530 is it,any farther and it will fail.

Quote:

Originally Posted by mike tkach (Post 4016381)

Agreed. My buddys production Gen V's .030 over barely made the sonic test. His blocks are done at 509CI. The 454 based Gen V, I am not sure how far they can go. I know some have gone .060 without issues.

Anyone ever measure the deck thickness on a Mark IV and measured the deck thickness on a Gen V/VI production block?

just to clarify,i am talking about the 502 blocks,i dont know about the 454 blocks.

Thanks for that info mike. From what I have gathered, the Gen V 454 (in most cases unless significant corrosion or core shift occurred at birth) the Gen V & VI cylinder barrels are of similar thickness. Many state Gen V 454 decks are slightly thicker than that of the VI. I cannot confirm this. The only real advantage I see is the VI has raised lifter bores(which isn't a big selling point in a marine app IMO that turns low RPM and often aftermarket lifters). Would like to get your take on this?

Initially, I had thought the GEN VI 454 block would offer an advantage due to it being more compatible than a Gen V block with GEN IV heads. After speaking with a tech at Dart machinery, I realized that the aftermarket coolant passages, which are referred to as (Gen IV) are actually a universal or modified gen IV) so there is more meat than if you used a GM gen IV casting on a Gen V block. I have no experience regarding the 502 blocks.

Next week I'm going to swing by the machine shop to drop off my block. I will have it cleaned and sonic checked. My machinist has several gen IV & VI blocks. If he has time, I will have him measure the differences.