Re: Mopar mega. Block
[Re: cesar perez]
#2818386
09/07/20 11:36 PM
09/07/20 11:36 PM
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Joined: Jan 2003
Posts: 7,471 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,471
Minnesota
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Cesar, assuming you mean Hemi, a megablock means it is siamese bores. If it does not have core shift, it will go 4.500. A regular Hemi block is generally good for 4.310
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Mopar mega. Block
[Re: 73DAD]
#2818448
09/08/20 09:30 AM
09/08/20 09:30 AM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Ours is on 4.565 sonic checked ok on thrust apart from back cylinders no. 7 & 8 bulkhead side are a bit thin but no probs yet and holds temps well with street driving/racing, but the combo makes max hp @only 6000rpm.
Last edited by rb446; 09/08/20 09:34 AM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: Mopar mega. Block
[Re: 73DAD]
#2818453
09/08/20 09:45 AM
09/08/20 09:45 AM
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Joined: Jan 2003
Posts: 13,318 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,318
Marion, South Carolina [><]
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The instruction sheets that shipped with them originally claimed they'd go to 4.600" actually, but I don't know anybody who's tried it. I thought the later MP/World "megablocks" were the only ones that claimed they'd go out to 4.600"?
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Mopar mega. Block
[Re: an8sec70cuda]
#2818467
09/08/20 10:28 AM
09/08/20 10:28 AM
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Joined: Jan 2003
Posts: 7,471 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,471
Minnesota
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In my response above, I was referring to the pre-World Mopar Hemi blocks.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Mopar mega. Block
[Re: second 70]
#2818525
09/08/20 12:48 PM
09/08/20 12:48 PM
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Joined: May 2019
Posts: 701 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 701
Lake Villa Il
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Fwiw I have a full water jacket block and there's a sticker on the bellhousing area that says 4.34 max bore.
Maybe best to just have it sonic checked.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: Mopar mega. Block
[Re: INTMD8]
#2818806
09/09/20 04:49 AM
09/09/20 04:49 AM
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Joined: Jan 2003
Posts: 2,901 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,901
A shed in England
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Just for Info, we had a 4.50 bore 528, using an early # 625. The block had a crack in the external water jacket nr the starter. We got it repaired but we still always had to run it with block / rad sealer. Doing a little bit of digging I heard there was a few out there like that. Anyway, we got a replacement block sent over to the UK FOC after my wife managed to get hold of Dave Hakims email address,that one was a #624. We ran the 528 for years and it's still going with another owner but then we wanted to go 572. We dug the #624 out, it was sonic checked, there was no way it would safely go out to 4.50". We ended up with a KB block.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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