Showing results 1 to 25 of 92
Search took 0.01 seconds.
Search: Posts Made By: mrmark1957
Forum: Pontiac - Street 09-06-2023, 11:48 PM
Replies: 26
Views: 1,371
Posted By mrmark1957
Since you have the 455. put 6x-4 heads and a...

Since you have the 455. put 6x-4 heads and a Summit 2801 cam in it. Since you have the TH-350, put the lower 1st and 2nd gear set in it along with the better sprag and a TransGo shift kit. Stock...
Forum: Exhaust TECH 08-17-2023, 01:26 AM
Replies: 1
Views: 574
Posted By mrmark1957
Best fitting street headers for a '73 LeMans ?

What brand/model header would be a best fit for a mild 400 motor in a '73 LeMans ?
Forum: Pontiac - Street 04-24-2023, 06:45 PM
Replies: 15
Views: 670
Posted By mrmark1957
The motor is a .030 over 400 so it's a 406 cubic...

The motor is a .030 over 400 so it's a 406 cubic inch. Machine shop flowed the heads also at my request as I had cleaned up the exhaust bowls. Intake ports flowed about 200 cfm and exhaust about 175...
Forum: Pontiac - Street 04-23-2023, 07:20 PM
Replies: 15
Views: 670
Posted By mrmark1957
Not planning on running the motor faster than...

Not planning on running the motor faster than 5000 rpm.
Forum: Pontiac - Street 04-23-2023, 07:17 PM
Replies: 15
Views: 670
Posted By mrmark1957
The guides have been machined for Viton seals and...

The guides have been machined for Viton seals and the factory oil shields and o-rings have not been used. The oil shield accounts for .025'' of the additional installed height. The intake seats are...
Forum: Pontiac - Street 04-22-2023, 09:58 PM
Replies: 15
Views: 670
Posted By mrmark1957
1.675" Installed height on #13 heads

The machine shop that did the valve job and assembled my #13 heads set the installed height at 1.675". When I asked if the springs should be shimmed to 1.6" the guy said the Comp 988 springs had...
Forum: Pontiac - Street 04-08-2023, 07:25 PM
Replies: 4
Views: 354
Posted By mrmark1957
What P/S and Alt brackets for #13 heads

I'm in the process of swapping a pair of #13 heads in place of the 6X-8 heads on my 400 inch motor in my '73 LeMans. The '73 P/S and Alt brackets don't line up with the bolt holes in the #13 heads....
Forum: Pontiac - Street 03-11-2023, 01:46 AM
Replies: 43
Views: 3,827
Posted By mrmark1957
I bought a '79 T/A 6.6 litre WS-6, 4 speed Trans...

I bought a '79 T/A 6.6 litre WS-6, 4 speed Trans Am in '83 from the original owner with 22K miles on it for my future wife. Rear axle was 3.23 posi, absolutely all stock, no nothing. Took it to...
Forum: Pontiac - Street 02-23-2023, 11:07 PM
Replies: 13
Views: 925
Posted By mrmark1957
Does anyone make a retainer that would fit in my...

Does anyone make a retainer that would fit in my application ?
Forum: Pontiac - Street 02-23-2023, 10:03 PM
Replies: 13
Views: 925
Posted By mrmark1957
Machine shops around here either don't want to be...

Machine shops around here either don't want to be bothered just machining the valve guides or are so busy they say come back in 6 months. I figure that the stock setup worked well for millions of...
Forum: Pontiac - Street 02-23-2023, 09:58 PM
Replies: 13
Views: 925
Posted By mrmark1957
The Summit cam has .050 inch more lift than the...

The Summit cam has .050 inch more lift than the stock Pontiac 066 cam. I'm thinking a .050 inch short retainer should give me the same clearance as the stock setup.
Forum: Pontiac - Street 02-23-2023, 07:11 PM
Replies: 13
Views: 925
Posted By mrmark1957
Use what retainers with a Summit 2801 cam ?

I'm putting a Summit 2801 cam into a stock engine with # 13 heads. Using Comp 988 valve springs and rubber o-ring valve stem oil seals. Exhaust lift is .466 inch. Can I use stock valve spring...
Forum: Pontiac - Street 02-23-2023, 03:31 AM
Replies: 4
Views: 697
Posted By mrmark1957
Retainer to valve guide clearance

Will there be enough valve spring retainer to valve guide clearance using the 2801 cam with stock 1.5 rockers ?. I'm using Comp 988 springs and o-rings for valve seals.
Forum: Pontiac - Street 02-09-2023, 04:07 AM
Replies: 5
Views: 823
Posted By mrmark1957
Who refurbishes/rebuilds Carter AFB carbs?

Picked up a complete core AFB for my '67 400 and it needs a refresh.
Forum: Pontiac - Street 02-05-2023, 02:36 AM
Replies: 55
Views: 3,917
Posted By mrmark1957
Start pulling plug wires off one at a time with...

Start pulling plug wires off one at a time with the engine knocking. If there is a problem with any cylinder's piston,pin or rod bearing the noise will change as the wire goes on and off.
Forum: Pontiac - Street 01-30-2023, 04:48 AM
Replies: 8
Views: 733
Posted By mrmark1957
Best HFT lifter available now for daily driver.

I purchased a '73 Le Mans with a recently (2019) rebuilt 400 engine which had a Howard's cam and lifter kit installed in it. (CL-410011-12). Comp Cams #988 springs and roller tip rockers. Valve...
Forum: Pontiac - Street 01-28-2023, 11:13 PM
Replies: 11
Views: 1,000
Posted By mrmark1957
I changed the rear wheel cylinders on my '73...

I changed the rear wheel cylinders on my '73 lemans last week and the fluid that came out was orange, looked like rusty water. You may have water contamination in the rear brake fluid system.
Forum: Pontiac - Street 01-25-2023, 11:41 PM
Replies: 4
Views: 671
Posted By mrmark1957
I remember a few years ago when a Judge went for...

I remember a few years ago when a Judge went for about $ 250K and everyone was surprised.
Forum: Pontiac - Street 01-25-2023, 11:39 PM
Replies: 44
Views: 3,438
Posted By mrmark1957
What thermostat to use, 180 or 195 ?

What temperature thermostat is every using in their 1960's and 1970's street driven Pontiacs ?
Forum: Pontiac - Street 01-09-2023, 11:01 PM
Replies: 61
Views: 5,435
Posted By mrmark1957
Do you remember what cylinder heads/ compression...

Do you remember what cylinder heads/ compression were on the 406 ? What octane gas did it need ?
Forum: Pontiac - Street 01-03-2023, 11:51 PM
Replies: 61
Views: 5,435
Posted By mrmark1957
1967 Catalina- 6X-4 head 462, T-400 w 2.75 1st,...

1967 Catalina- 6X-4 head 462, T-400 w 2.75 1st, 2.56 posi.
1971 Olds 442-Shafiroff 540 pump gas Chevy, T-400 w 10"Coan, 3.08 Moser 12 bolt posi.
Forum: Pontiac - Street 12-31-2022, 06:06 PM
Replies: 8
Views: 1,221
Posted By mrmark1957
I have seen some head gaskets compress over time....

I have seen some head gaskets compress over time. Torque them properly one day, recheck them the next day before putting on the valve covers and some of the bolts want a little more. Mostly the...
Forum: Pontiac - Street 12-30-2022, 11:17 PM
Replies: 8
Views: 1,221
Posted By mrmark1957
Had a similar thing happen to me. Head gasket...

Had a similar thing happen to me. Head gasket leaked a little and motor started to idle rough. Torqued both heads down, many bolts moved 1/4 turn. Leak stopped and motor ran smooth.no problems after...
Forum: Pontiac - Street 12-29-2022, 10:15 AM
Replies: 13
Views: 1,106
Posted By mrmark1957
Note that due to the big Intake valve size and...

Note that due to the big Intake valve size and the 30 degree seat used on most of the iron heads that I consider setting up the Intake springs for 130 to 135 psi the way to go.
The Exh valves can...
Forum: Pontiac - Street 12-29-2022, 03:48 AM
Replies: 13
Views: 1,106
Posted By mrmark1957
670 heads vs # 13's

How much performance difference, if any, would there be between a set of 670's compared to a set of 13's,on a mild 400 build ?. 068, logs, Q-Jet. Both sets being stock, unmodified or both sets being...
Showing results 1 to 25 of 92

 
Forum Jump

All times are GMT -4. The time now is 07:34 AM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017