High Performance Big Block Cadillacs
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Author Topic: Coolant in Oil Sucks!  (Read 19277 times)
MTS Marty
C4
****
Posts: 282


« Reply #15 on: November 14, 2011, 08:50:39 AM »

The replacement piston is from EGGE.  Last cast piston mfg in the USA. Acrual comp. with those pistons is 9.8 to 1.

If the 500 has an egr valve and no AIR ports in the heads it is a 75 or 76  500

The ***250 heads you have will work fine on the 500 with the right pistons.

We have cast replacement 472 pistons like the ones you have in .030, .040 .060. NORMALLY we can order std

We have many choices for 500 pistons. Cast 1970 style (9.3 to 1) and forged 10 to 1
If wanted we have forged "H" beam rods with forged pistons and moly rings for $1100 as a package. Availabe in .030 and .050 oversizes
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dave brode
C5
*****
Posts: 1074


Best of 11.66, 113.96, 1.59 sixty


« Reply #16 on: November 14, 2011, 04:56:37 PM »

As Marty said, no issue running the #250 heads on a 500, with the proper piston for desired compression.

Year for year, the 472 and 500 used same heads. There are several different castings for early heads and several for later, but they'll all work, as long as the piston matches. Btw, Marty has a nice tech guide that explains all of this and more.

Advertised compression ratios were quite a stretch [lie]. Actual is lower than advertised.

Dave
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3960 lb '71 C-10. 11.7-1 CR 514". PEP I beam rods floating MTS 18cc dish Probes, Elgin solid cam, home ported heads, MTS 2.19/1.84", Potter/Probe shaft rockers, edel 2115, 4781 850. Switch-pitch TH400, 12" 1800/3200 Tri-Shield convertor, 4.30 gears. Best so far of 11.66, 114.8 mph and 1.59 sixty
online170
C2
**
Posts: 58


« Reply #17 on: November 15, 2011, 07:04:43 AM »

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« Last Edit: August 29, 2017, 06:21:28 PM by online170 » Logged
MTS Marty
C4
****
Posts: 282


« Reply #18 on: November 15, 2011, 09:24:14 AM »

The combo above is with a 6.750" rod
The 7.1" rods use normal bearings - not narrowed
The 7.1" combo is $150 More due to the rod bolts and costlier narrow rings. Available in .020, .050 & .075 oversizes   All 10 to 1

The part are balanced / weight matched separately before assembly
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online170
C2
**
Posts: 58


« Reply #19 on: November 15, 2011, 12:07:22 PM »

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« Last Edit: August 29, 2017, 06:21:37 PM by online170 » Logged
online170
C2
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Posts: 58


« Reply #20 on: November 16, 2011, 08:32:42 AM »

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« Last Edit: August 29, 2017, 06:21:47 PM by online170 » Logged
online170
C2
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Posts: 58


« Reply #21 on: November 16, 2011, 08:42:04 AM »

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« Last Edit: August 29, 2017, 06:22:00 PM by online170 » Logged
~JM~
Shop Keeper
C5
*****
Posts: 1853


« Reply #22 on: November 17, 2011, 01:38:56 PM »

...Any disadvantages to going huge over bore in one shot? I was thinking of going 0.030 over, so it will have meat left if it ever needs rebuilt. Any reason to not go to say 0.075 or 0.08 first shot?
Like, Overheating, weakening block, etc etc....

Some will say that the larger over bore will gain some intake flow by unshrouding the cylinder. Is there any price difference in the machining or parts?

~JM~
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PS. You don't have enough cam. Grin

...Summit has a kit for $99.... Shocked
online170
C2
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Posts: 58


« Reply #23 on: November 17, 2011, 02:31:06 PM »

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« Last Edit: August 29, 2017, 06:22:11 PM by online170 » Logged
MTS Marty
C4
****
Posts: 282


« Reply #24 on: November 17, 2011, 04:15:49 PM »

if you go past .4.375 head gaskets cost $200 a pair and up - no issue with cooling if the block is cleaned properly
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online170
C2
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Posts: 58


« Reply #25 on: November 18, 2011, 11:00:18 AM »

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« Last Edit: August 29, 2017, 06:22:35 PM by online170 » Logged
dave brode
C5
*****
Posts: 1074


Best of 11.66, 113.96, 1.59 sixty


« Reply #26 on: November 19, 2011, 09:29:33 PM »

> next question, Im trying to decide between the custom pistons and the regular forged 10:1 pistons. And the 7.1rods vs the 6.75 rods.

I will have the block square decked, probably just a clean up cut less than 0.01". Can I drop in either piston/rod combo and not worry about deck height? Or does the 7.1 get dangerously close to the deck height?

The pistons MTS sells for the 7.1" rods are shorter, so the deck clearance is "normal". Afaik, they sell, or have sold, pistons for stock 6.75", 7" and now the 7.1". He also sells forgings for stock 6.75" rods too, afaik.

> Secondly, Id like to build some longevity into the engine. Do I have to worry about the life of the thinner piston rings if I go with the 7.1 rods? Basically, are the thinner rings more of a race application which will require refreshing more often?

Imo, no, assuming you buy normal tension rings. A 1/16" ring isn't that narrow. Rings in newer engines are much narrower than in our old stuff, which used 5/32". 

> Final question, what kind of clearance differences are we talking about from the factory rods, to the H-beam rods, to the 7.1" rods? I always get my machinist to assemble the shortblock so he can check all clearances. Any extra leg work required for the H-beam rods?

I would ask Marty. The bearing clearances usually come out good if the rods and main bores are near high, and the crank is near low. Tight is bad. Rod to rod side clearance is often tight, but that should be checked in any build.

Dave
 
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3960 lb '71 C-10. 11.7-1 CR 514". PEP I beam rods floating MTS 18cc dish Probes, Elgin solid cam, home ported heads, MTS 2.19/1.84", Potter/Probe shaft rockers, edel 2115, 4781 850. Switch-pitch TH400, 12" 1800/3200 Tri-Shield convertor, 4.30 gears. Best so far of 11.66, 114.8 mph and 1.59 sixty
online170
C2
**
Posts: 58


« Reply #27 on: November 27, 2011, 10:21:45 AM »

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« Last Edit: August 29, 2017, 06:22:49 PM by online170 » Logged
MTS Marty
C4
****
Posts: 282


« Reply #28 on: November 27, 2011, 01:59:30 PM »

A cut of .010 is no issue. The 6.75" combo would be about zero and the 7.1" combo about .003 out. This would leave .040 or .047 quench depending on head gaskets
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~JM~
Shop Keeper
C5
*****
Posts: 1853


« Reply #29 on: November 27, 2011, 02:38:42 PM »

When I built my 500, I enlarged, blended & polished the oil port that the oil pump feeds. Then I lightly dressed the flat surface with a sharpening stone in a figure eight pattern. I also had the cross-over & the 2 oil passages behind the timing gear tapped for threaded plugs instead of press fit plugs. You must be careful with the plug on one of the oil passages behind the timing gear. If the plug goes in to far it will cut off oil flow to that side.

~JM~


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Logged

PS. You don't have enough cam. Grin

...Summit has a kit for $99.... Shocked
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