Forum: Pontiac - Street
10-17-2013, 07:18 AM
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Replies: 10
Views: 918
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Forum: Pontiac - Street
10-14-2013, 08:48 AM
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Replies: 10
Views: 918
68blackbird - I have what (I think) look like...
68blackbird - I have what (I think) look like standard 455ci iron heads on it. I dont have the spec for this engine as paperwork was lost with previous owner. The casting number however on the head...
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Forum: Pontiac - Race
10-14-2013, 07:35 AM
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Replies: 33
Views: 2,493
I'd not heard of windage tray. Sounds like...
I'd not heard of windage tray. Sounds like something I might need after a curry and a lot of beers, but now i know, I'll take a look at it!
gtofreek - did the 455ci you built have the cryogenics...
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Forum: Pontiac - Street
10-12-2013, 08:19 AM
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Replies: 10
Views: 918
Great advice, thanks. Someone I know has seen...
Great advice, thanks. Someone I know has seen excessive valve stem height variation on brand new expensive Edelbrock heads. Could be a one off, but Would make me nervous spending that kind of money...
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Forum: Pontiac - Race
10-12-2013, 08:13 AM
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Replies: 33
Views: 2,493
By Windage tray do you mean Muncie?
Any...
By Windage tray do you mean Muncie?
Any recommendations for an street use auto box with stall converter? Won't be racing it but may want to lick off some kid at the green lights...
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Forum: Pontiac - Race
10-11-2013, 04:00 PM
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Replies: 33
Views: 2,493
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Forum: 66-67 GTO Tempest & LeMans TECH
10-11-2013, 03:53 PM
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Replies: 25
Views: 4,285
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Forum: Pontiac - Street
10-11-2013, 03:49 PM
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Replies: 10
Views: 918
455 cylinder heads
Hi,
Any views on what are the best heads for an early 455ci Gto? I currently have pontiac iron heads on my 455. I'm not convinced that eg Edelbrock are the best quality - they're mass market, so...
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Forum: 66-67 GTO Tempest & LeMans TECH
10-11-2013, 03:36 PM
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Replies: 28
Views: 1,520
Hi,
If you search under my name, I've posted...
Hi,
If you search under my name, I've posted lots of messages on a similar thread. Essentially you need to physically check:
1) GPS actual current mph vs engine rpm. Use the gps figure when using...
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Forum: 66-67 GTO Tempest & LeMans TECH
09-12-2013, 04:00 PM
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Replies: 25
Views: 4,285
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Forum: 66-67 GTO Tempest & LeMans TECH
09-12-2013, 03:04 PM
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Replies: 25
Views: 4,285
http://www.summitracing.com/parts/rmg-4900111
...
http://www.summitracing.com/parts/rmg-4900111
Suggests I can get a 3.08 gear on a 8.2" 10bolt, whereas I thought 3.36 was lowest. Any thoughts on whether this is correct? Am I missing something...
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Forum: 66-67 GTO Tempest & LeMans TECH
09-12-2013, 04:36 AM
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Replies: 12
Views: 701
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Forum: 66-67 GTO Tempest & LeMans TECH
09-11-2013, 06:25 PM
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Replies: 3
Views: 564
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Forum: 66-67 GTO Tempest & LeMans TECH
09-11-2013, 01:46 PM
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Replies: 25
Views: 4,285
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Forum: 66-67 GTO Tempest & LeMans TECH
09-11-2013, 12:20 PM
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Replies: 25
Views: 4,285
Thanks Gary. I need to be able to cruise at...
Thanks Gary. I need to be able to cruise at 70mph without too much effort - big lorries will pass me at 60mph over in the UK, but yes this could work if I used these tyres perhaps.
I have lots of...
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Forum: 66-67 GTO Tempest & LeMans TECH
09-11-2013, 08:52 AM
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Replies: 12
Views: 701
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Forum: 66-67 GTO Tempest & LeMans TECH
09-11-2013, 08:25 AM
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Replies: 12
Views: 701
Thanks again. My speedo is 25-30% inaccurate,...
Thanks again. My speedo is 25-30% inaccurate, and the car is on the ramp with the axle off right now so we cant do that test. But this may be a good test if we put it back together and for others...
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Forum: 66-67 GTO Tempest & LeMans TECH
09-11-2013, 06:42 AM
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Replies: 12
Views: 701
Thanks Jeff. This only tells me I have a 64-65...
Thanks Jeff. This only tells me I have a 64-65 unit, doesnt tell me whether it's M20 or 21, which is the hard bit to know while it's installed in the car as they didnt number it until in later years...
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Forum: 66-67 GTO Tempest & LeMans TECH
09-11-2013, 04:41 AM
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Replies: 3
Views: 564
Retracing original owner of my Purple 67 GTO
Hi,
I'm not sure if this is the correct thread to post this is, but help on tracing my 67 GTO's past would be really appreciated as I'm running into a few problems in not knowing what the spec of...
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Forum: 66-67 GTO Tempest & LeMans TECH
09-11-2013, 03:42 AM
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Replies: 12
Views: 701
Do I have a Muncie M20 or M21?
Hi,
I have a 67 GTO with 3.73 rear gears. My Muncie trans has the following numbers:
Tag# 9774825
Casting# 3831707 3851325
Tailshaft# 3846429
I have seen links on Chevy forums from back in...
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Forum: 66-67 GTO Tempest & LeMans TECH
09-09-2013, 04:41 PM
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Replies: 25
Views: 4,285
What's lowest gear ratio on 8.2" 10 bolt?
Hi,
I have 8.2" 10 bolt rear end from a 65 Chevelle with 3.73 gears in my 67 GTO - is the lowest gear possible a 3.30 with this 8.2" unit, or can I get a 3.23 or 3.08 to fit at all? If I can, what...
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Forum: Pontiac - Race
08-29-2013, 02:57 PM
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Replies: 33
Views: 2,493
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Forum: Pontiac - Race
08-25-2013, 06:22 AM
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Replies: 33
Views: 2,493
Thanks for the advice guys. Yes there are some...
Thanks for the advice guys. Yes there are some good engine builders / machine shops as there is a large US muscle car race scene over here (in fact there's a 2 day event this weekend I'm going to...
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Forum: Pontiac - Race
08-24-2013, 12:18 PM
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Replies: 33
Views: 2,493
Great info guys. In uk we run 95 octane as...
Great info guys. In uk we run 95 octane as standard with 98 as the premium stuff. I run normal pump gas right now.
Would it be more cost effective to start with my 455ci or sell it as a good...
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Forum: Pontiac - Race
08-23-2013, 04:39 PM
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Replies: 33
Views: 2,493
500hp engine build options
Hi,
I have an early 1970s 455ci in my 67 GTO (might even be late 60s) and when finances allow, i want a shiny new one for better looks under the hood, performance and reliability increase, but also...
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