KeyserSoze

Hey guys I just took my block in to the local machine shop (the rings went out) with some forged pistons that I had laying around so that the shop could bore the block to match the pistons and balance the block. The pistons are some JE srp forged pistons which are .020" oversized, the machine shop messed up and bored my block to .030" over stock bore. Now I can get them to discount the price of the labor to the point where the cost of new pistons included in the price of everything else will be the same as it would have been had they not messed up. Here's the question......Will .030" overbore make the cylinder walls to thin, the car will be F/I (probbably boosting ~12 lbs)??

Here's the setup:

GSR, light port and polish head, itr cams, crower valvetrain, forged 9:1 pistons, arp bolts, eagle h beam rods, block balanced w/ all new bearings, tuned by AEM stand alone, straight t04 garrett turbo, skunk2 intake man.

****BTW: Thinking of getting a Rev Hard intake man, Miles at Rev Hard said that the intake man flows 30 scfm more than the victor X man and that it was made specifically for tubro motors. Anyone heard anything about these manifolds?? Good or bad. Thanks 4 ne info.

johnmay19

Unless you get .030 over pistons then the block is useless. .010" piston to wall clearance is way to excessive.

NJIN BUILDR

The extra .010" isn't a big deal.If it was a ls block I would just say get another block.The problem you are going to have is getting pistons in .030" over.Srp/JE only goes to +.020".
Glenn

Muckman

iTrader: (2)

.030" over isnt even 1mm. your fine. just get properly sized pistons.

KeyserSoze

yea, thanks for the responses, Muckman hit the nail on the head. I know that I will have to get pistons that match the bore, that wasn't the question, but I started reading some and saw people who are boring stock sleeves to 85mm+ so I assume that ~82mm won't be any issue. The pistons will have to be specially made by JE but I will have the machine shop deduct the cost of the pistons from the labor charges so I will not pay anymore than I was originally supposed to. Thank you for all the suggestions....

BTW anyone hear about the manifold I spoke of earlier??? Or a good SoCal AEM ems tuner?? Thanks.

Fkned

uh you can't bore most stock b series blocks to 85 mm only a b20.I would have them get you a new block,even if they can get you a set of .030 over pistons you have lost a possible rebuild on the block thru their mistake.

KeyserSoze

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ed’s Racing Heads &raquo;</TD></TR><TR><TD CLASS="quote">uh you can't bore most stock b series blocks to 85 mm only a b20.I would have them get you a new block,even if they can get you a set of .030 over pistons you have lost a possible rebuild on the block thru their mistake.</TD></TR></TABLE>

Yeah, I dont know much about boring a b-series block, but I have met some who have "claimed" to have bore thier b18x blocks to 85mm. Maybe they lied to me, but what looks like is going to happen is that the machine shop will provide me with a new block with a .020" bore and keep the .030" bore block. Thanks for the info....

Question : (One more time) Anyone heard of Rev Hards intake manifold?? Supposedly better flowing than the Edlebrock victor X.