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#1
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Mid plate questions
I have a 70 Lemans, turbo charged. I am in the middle of a tranny change.
I have 3 questions. 1- Do you think a mid plate will help with stock block life. 2- how did you guys mount the plate 3- Aluminum or steel? It is a street car. Thanks in advance. |
#2
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Steel mid plate. Check to make sure your headers do not cross the parting line of the block and trans or they will hit the plate. Just pull your trans put the plate in reinstall the trans and weld in your frame tabs. Not too hard. Don't forget your converter spacers. I'm, of course, assuming you have an automatic. Takes stress off of the block and adds rigidity to the chassis. If you remove the stock mounts you will need some kind of retention device for the front of the engine also. All Pontiac front plate works well or even head plates.
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
#3
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Allpontiac Steel Mid Plate comes with two sets of torque converter spacers. It works very well to stabilize a block.
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Bob C. Quickest, Fastest, Best selling Pontiac Aftermarket Block IA II and Tiger Heads Boss Bird Funny Car Best pass to date 08/06/2016 6.027@231.64 Allpontiac Big Chief Aluminum Engine Block http://www.AllPontiac.com |
#4
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I'll call you tomorrow Thanks!!
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#5
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Quote:
I made my mid plate out of 1/8” steel! GTO George |
#6
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most convertor guys I talked to said 1/8" is ok. just make sure you use spacers. 1/4" definitely needs extension.
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2007 Norwalk Quick 16 Winner 8.960 @152.24 8.96 dial http://www.youtube.com/watch?v=8HY_nJR9Aa0&NR=1 |
#7
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Quote:
GTO George |
#8
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I think I get more frame flex with out the mid plate. My left motor mount and chain wants to take the left rail and flip it over.
The mid plate will mount further back on the down side of of the rails. there is less side to side movement there than where the motor mounts are. At least that whats my head tells me. If someone can has experience with that, please fill us in. I have a poly tranny mount. |
#9
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Can I use my motor mounts instead of the front plate? Thanks for the reply's. Car has forward facing headers, it is turbo charged, so no header issues
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#10
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I think it's wise to use rubber front mounts with a midplate, at least from the standpoint of minimizing block stress. Rigid 4-point mounting places considerable chassis-flex stress on a block.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
#11
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I think that’s a good idea Jack, stock chassis have a habit of flexing specially with gobs of power. In a chassis car solid all the way around! .
GTO George |
#12
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PM sent
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6.98 @ 199mph 4.53 @ 164mph |
#13
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#14
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Remember most phone calls go out west and they are 3 hours behind the East Coast time.
I am on East Coast time. 804 349 0014
__________________
Bob C. Quickest, Fastest, Best selling Pontiac Aftermarket Block IA II and Tiger Heads Boss Bird Funny Car Best pass to date 08/06/2016 6.027@231.64 Allpontiac Big Chief Aluminum Engine Block http://www.AllPontiac.com |
#15
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We tried 1/8 steel and it flexes to much. We use 3/16 steel. It is the front to back motion that you need to worry about. The drive shaft needs to float if does not have end clearance you have it jam in to the trans. That is why you put a added bar on a motor with out motor plates to keep the motor from moving front to back.
__________________
Bob C. Quickest, Fastest, Best selling Pontiac Aftermarket Block IA II and Tiger Heads Boss Bird Funny Car Best pass to date 08/06/2016 6.027@231.64 Allpontiac Big Chief Aluminum Engine Block http://www.AllPontiac.com |
#16
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Quote:
GTO GEORGE |
#17
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longer dowel pins may be needed also --
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#18
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Longer Dowel pins for the trans in the block?
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
#19
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Yes, mid plate takes up space (between engine and trans) .....pins (in engine) need to stay engaged in trans.
GTO George |
#20
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Yes the mid plate is 3/16, you have to make sure the tranny is in the dowel pins too.
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