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Posts Made By:
dmac
Forum:
Pontiac - Street
03-28-2022, 06:03 PM
Replies:
47
Max potential for small valve heads
Views:
3,630
Posted By
dmac
Max potential for small valve heads
I have the original #15 small valve heads off the 455/467, and expect about 450HP around 5000 rpm, MAX. Cam will be done by right about that point in this low CR engine.
Lower rpm should be...
Forum:
Pontiac - Street
01-27-2022, 08:40 PM
Replies:
71
Points or hei distributor
Views:
9,443
Posted By
dmac
Electronic stuff is great right until it fails....
Electronic stuff is great right until it fails. Mechanical stuff that electronics has replaced almost always gives you some notice it is going bad, when used as intended.
Forum:
Pontiac - Street
01-19-2022, 10:07 PM
Replies:
35
428 vs 455 differences
Views:
5,875
Posted By
dmac
Beefing up the transmissionisn't cheap either.
Beefing up the transmissionisn't cheap either.
Forum:
Pontiac - Street
11-19-2021, 04:29 PM
Replies:
14
Replacing engine mounts with engine in chassis
Views:
3,015
Posted By
dmac
Watch the fan shroud
Watch the fan shroud
Forum:
Pontiac - Street
11-15-2021, 05:50 PM
Replies:
50
octane booster
Views:
7,215
Posted By
dmac
In common language, when most of the auto parts...
In common language, when most of the auto parts store octane boosters say '2 point' increase, it really means .2 increase, as in going from 91 octane, to 91.2.
I don't know if saying 'two points'...
Forum:
Pontiac - Street
10-18-2021, 07:36 PM
Replies:
48
What would you do different if you had it to do over?
Views:
5,652
Posted By
dmac
I would simply spend a few dollars more to send...
I would simply spend a few dollars more to send the block and stroker kit to a shop that worked with lots of pontiacs.
The local shop didn't zero deck the block like I asked, and told me I could...
Forum:
Pontiac - Street
10-14-2021, 01:17 PM
Replies:
40
6x-4's or 8s?
Views:
3,550
Posted By
dmac
For a street car running pump gas, getting the CR...
For a street car running pump gas, getting the CR right should top concerns over flow. I doubt that performance at street RPMs will vary much if at all, but 'street' use can mean different things to...
Forum:
Pontiac - Street
09-14-2021, 04:05 PM
Replies:
21
RHOADES LIFTERS and High Pressure Oil Pump
Views:
3,465
Posted By
dmac
Could oil pressure in the lifter bore slow the...
Could oil pressure in the lifter bore slow the 'leakage' some? I always assumed that the leakdown came out of the fill hole in the exterior shell? If the leakage occurs on top of the lifter, oil...
Forum:
Pontiac - Street
09-14-2021, 03:53 PM
Replies:
56
No compression in cylinders #2 & #$4
Views:
13,793
Posted By
dmac
Did you ever check the pushrods for straight?...
Did you ever check the pushrods for straight? Rolling them on a flat piece of glass will expose any that are bent. Looks like #4 exhaust is maybe hanging open letting exhaust in, blackening that...
Forum:
Pontiac - Street
09-03-2021, 10:37 PM
Replies:
22
Deck height question
Views:
3,271
Posted By
dmac
You could mill less than the total amount and...
You could mill less than the total amount and combine with a slightly thinner gasket. Going to a much thinner gasket could be an issue. The thinner gaskets I've see require a more perfect finish...
Forum:
Pontiac - Street
08-27-2021, 08:07 AM
Replies:
60
Cam change - what to expect
Views:
12,730
Posted By
dmac
Forgot all about the hr cam!. Now I am wondering...
Forgot all about the hr cam!. Now I am wondering if more lift would throw off your rocker geometry and mean you need new pushrods. .
A new cam could have a different base circle starting point...
Forum:
Pontiac - Street
08-26-2021, 10:10 PM
Replies:
60
Cam change - what to expect
Views:
12,730
Posted By
dmac
I just saw this and thought that maybe a gear...
I just saw this and thought that maybe a gear change might be easier like going to 3.23 or 3.08 if this is to be a street car you can afford to drive. If it is running great, I would hate to mess...
Forum:
Pontiac - Street
06-29-2021, 05:15 PM
Replies:
53
Looking at an engine for sale locally.
Views:
10,334
Posted By
dmac
Exactly this!!!!!! Cam change would be pretty...
Exactly this!!!!!! Cam change would be pretty simple with engine already out. Cam/lifters for under $400 would still be a great deal, but you would still want to know whether it is stroked, but that...
Forum:
Pontiac - Street
06-24-2021, 08:44 PM
Replies:
45
Thoughts on 3.55 to 3.08 swap?
Views:
6,549
Posted By
dmac
Going from a 26" tall tire to a 28" tire changes...
Going from a 26" tall tire to a 28" tire changes gear ratio from 3.55 to 3.30 according to Wallace racing Chart. Going from a 3.55 to a 3.36 AND getting slightly taller tires could get you pretty...
Forum:
Pontiac - Street
06-14-2021, 06:18 PM
Replies:
12
Engine suddenly shut down
Views:
1,764
Posted By
dmac
That exact issue happened to me in a brand new...
That exact issue happened to me in a brand new car with electronic ignition in an 83(?) chevy I had bought specifically to make a cross country trip in. It happened 3 times at highways speeds.
...
Forum:
Pontiac - Street
05-24-2021, 04:20 PM
Replies:
79
Will my 406 make over 500 hp?
Views:
13,584
Posted By
dmac
If you already have all the parts, you couls mill...
If you already have all the parts, you couls mill the heads some for more compression if you have good gas available. And you mentioned something about wanting to keep rpms down, so you would need a...
Forum:
Pontiac - Street
04-13-2021, 04:38 PM
Replies:
92
Roller Cams with low lift and long ramps
Views:
8,404
Posted By
dmac
It is nice to see how simulations can be very...
It is nice to see how simulations can be very close to real world results.
I should have said that Lee ran simulations of about 4-5 stock cams from various manufacturers and several different...
Forum:
Pontiac - Street
04-11-2021, 09:35 PM
Replies:
92
Roller Cams with low lift and long ramps
Views:
8,404
Posted By
dmac
And everyone's goals are different. And low CR...
And everyone's goals are different. And low CR like 7.7: and 9.5: will change which cam is 'best' as will heads, rocker ratio, lifter choice, spring choice. There isn't enough time to test all the...
Forum:
Pontiac - Street
04-11-2021, 09:22 PM
Replies:
92
Roller Cams with low lift and long ramps
Views:
8,404
Posted By
dmac
Lee is the one who ran the dyno sims for me. And...
Lee is the one who ran the dyno sims for me. And he did need the intake closing info, and head flow etc. Funny that after multiple testing, the cam he came up with for a low CR/pump gas cam for...
Forum:
Pontiac - Street
04-09-2021, 03:51 PM
Replies:
92
Roller Cams with low lift and long ramps
Views:
8,404
Posted By
dmac
A member here ran quite a few simulations for a...
A member here ran quite a few simulations for a low CR, low rpm , high torque and came up with using the ultradyne H5 and H15 lobes on a 115 LSA advanced 8* and it had almost 500 ft/lbs of torque at...
Forum:
Pontiac - Street
04-07-2021, 04:43 PM
Replies:
6
670 heads?
Views:
1,436
Posted By
dmac
Just read in a post yesterday that if you use a...
Just read in a post yesterday that if you use a shallow chamber high compression head with dished pistons to lower the compression, at higher lifts they will have less valve shrouding than some of...
Forum:
Pontiac - Street
03-24-2021, 06:53 PM
Replies:
65
Improve Top-End RPM by Adjusting Hydraulic Lifters
Views:
8,437
Posted By
dmac
I have wondered for years about how high you can...
I have wondered for years about how high you can go with rocker ratio to 'soften' the lobe on the cam. I once had some 1.7 ratio rockers combined with Rhoads lifters on a cam similar to a Summit...
Forum:
Pontiac - Street
03-02-2021, 04:48 AM
Replies:
19
Project car worth?
Views:
2,800
Posted By
dmac
In California, it might be worth $5-6000 or even...
In California, it might be worth $5-6000 or even more due to the pre 1975 cars never needing to pass smog tests and there are so few of them.. The difference between a 1975 model and a 1976 model of...
Forum:
Pontiac - Street
01-07-2021, 08:07 PM
Replies:
53
Interesting gas issue
Views:
3,132
Posted By
dmac
Just a suggestion that has worked for me. turn...
Just a suggestion that has worked for me. turn the engine over without any stepping on the gas allowing the carb to fill. Then, before trying to turn over, pump pedal once to the floor, hold open and...
Forum:
Pontiac - Street
01-07-2021, 05:06 AM
Replies:
25
Big Valve Heads on a 350 - Some Questions
Views:
2,216
Posted By
dmac
Just curious, but where is the piston when max...
Just curious, but where is the piston when max lift is reached with the came timing advanced or retarded? Would that few degrees add the max cam lift, or could you advance the cam more to allow more...
Showing results 1 to 25 of 500
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