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#1
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Timing cover new vs old
I was talking to my machinist and I mentioned I was putting on tri power and had to go back to older timing cover with bumpout for thermostat cover.
He said he thought the newer ones had a different design and ran cooler. Does anyone have any info on that. Thanks Greg |
#2
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There are 11 bolts out there with the dimple for a tripower.I run a 4 bolt,a 8 bolt and a 11 bolt on my current cars and I see no diff in any of them.If I have a choice I would find a 11 bolt with the dimple.Tom
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The Following User Says Thank You to tom s For This Useful Post: | ||
#3
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#4
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I’ve seen covers with the dimple to clear the Tri-Power thermostat housing made by the factory as late as 1974.
The later covers will need a little work on the backside of the upper bolt boss to provide clearance for the thermostat housing, just a file the boss down by about an eighth of an inch and you’re good.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
#5
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The three coolest running cars in our club have the 8-bolt water pumps. On paper the 11-bolt sure looks to have the advantage, but we haven't seen that to be true. This is after tightening up the plates in both styles.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
#6
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Another option is finding an aluminum thermostat housing and weld/building it up on the inside so you can grind the clearance on the outside of the thermostat housing.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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