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by GARY C
Tue Sep 14, 2021 8:57 am
Forum: Engine Tech
Topic: Porting With an Electric Die Grinder
Replies: 41
Views: 1607

Re: Porting With an Electric Die Grinder

mt-engines wrote: Sun Sep 12, 2021 8:07 pm FOREDOM Flexible Shaft Grinder with a foot pedal. Air is too noisy.
Same here.
by GARY C
Sat Sep 11, 2021 12:16 pm
Forum: Engine Tech
Topic: Hydraulic roller lifters tick only under crankcase vacuum
Replies: 31
Views: 1071

Re: Hydraulic roller lifters tick only under crankcase vacuum

I figured it out! My assembly guy made a mistake assuming that just because the first lifter you check for oil band alignment is barely ok that all of them will be ok. We know better. Sometimes we need a kick in the nuts to remember the hard lessons we learned in the past. The combination of small ...
by GARY C
Tue Sep 07, 2021 11:03 am
Forum: Engine Tech
Topic: "Air Flow Experts" SpeedTalk interviews
Replies: 19
Views: 4020

Re: "Air Flow Experts" SpeedTalk interviews

Those and more are here for all the members of ST.
viewforum.php?f=47
by GARY C
Mon Sep 06, 2021 10:49 pm
Forum: Engine Tech
Topic: X pipes???
Replies: 16
Views: 1053

Re: X pipes???

by GARY C
Tue Aug 17, 2021 11:03 pm
Forum: Engine Tech
Topic: Opinion on X pipe design
Replies: 23
Views: 958

Re: Opinion on X pipe design

I always start with the Jegs universal kit, Summit has one as well.
https://www.jegs.com/p/JEGS/JEGS-Univer ... 2/10002/-1
by GARY C
Sat Jul 24, 2021 5:01 am
Forum: Engine Tech
Topic: Pontiac 400 heads
Replies: 62
Views: 2626

Re: Pontiac 400 heads

'Pontiacs have machined, very flat combustion chambers. Plus the heads that had the 30* seat used nail head valves. The two work together. The Pontiac Ram Air engines had more valve lift, & went to the 45* seat AND tulip shaped valves. Pontiac knew what they were doing. I am surprised David Vizard'...
by GARY C
Sat Jul 24, 2021 3:23 am
Forum: Engine Tech
Topic: Pontiac 400 heads
Replies: 62
Views: 2626

Re: Pontiac 400 heads

Some guys are saying 30 degree seat ,others are saying 45 on these heads,if we are talking about the early cast iron head If you use a 45 deg seat can you put a 30 degree top cut in ? If you use a 30 deg seat cut and no top cut like Gary is saying then I assume a 45 seat with a 30 tc is feasible bu...
by GARY C
Fri Jul 23, 2021 11:51 pm
Forum: Engine Tech
Topic: Pontiac 400 heads
Replies: 62
Views: 2626

Re: Pontiac 400 heads

It is about the application. You might run 16:1 CR on a race engine, but not on a street engine..... Very true. But that low port Pontiac head is no different than any other low port wedge head. It will respond to a 45 degree seat. As I posted long ago, I can’t think of an application where a 30 de...
by GARY C
Mon Jul 19, 2021 6:38 am
Forum: Engine Tech
Topic: 423 SBC combo help
Replies: 126
Views: 7658

Re: 423 SBC combo help

Gary, the distributor is subject to dynamic (not static) forces in the running engine not only side to side, but due to the spinning meshed gears on the drive end and constantly changing engine speeds and loading, I believe it would be subject to forces oscillating upward and downward as well. Now ...
by GARY C
Mon Jul 19, 2021 5:21 am
Forum: Engine Tech
Topic: Port CFM for Simulations
Replies: 48
Views: 1547

Re: Port CFM for Simulations

There is a data point for minimum port CFM. It can either be an input and I would enter my flow bench results or it can be a result and other data will determine the minimum CFM. But seeing as it's listed as port flow it could either with or without a manifold I suppose as there's no distinction. I...
by GARY C
Mon Jul 19, 2021 5:14 am
Forum: Engine Tech
Topic: 434 engine upgrades ?
Replies: 30
Views: 1415

Re: 434 engine upgrades ?

This is the car we ran a 306, 377, 382 and 421 in, the vid is running the 421.
https://www.youtube.com/watch?v=6RgKOCo0GhU
by GARY C
Mon Jul 19, 2021 5:11 am
Forum: Engine Tech
Topic: 434 engine upgrades ?
Replies: 30
Views: 1415

Re: 434 engine upgrades ?

Why not just spray it? It will accomplish your goal without changing anything else. I agree...because nitrous oxide is the best thing that ever happened to piston manufacturers. Seems to be more of a tuning problem and less of a nitrous problem. seen it more with alcohol dirt track engines. I start...
by GARY C
Mon Jul 19, 2021 4:52 am
Forum: Engine Tech
Topic: 423 SBC combo help
Replies: 126
Views: 7658

Re: 423 SBC combo help

Wish you all the best! And I believe you are correct regarding the plastic AFR intake flexing at rear due to distributor being mounted through intake on small block Chevy. You can get away with that using either a cast-iron or well made and correctly machined aluminum intake, but asking plastic to ...
by GARY C
Mon Jul 19, 2021 4:47 am
Forum: Engine Tech
Topic: Where should I install this cam?
Replies: 16
Views: 921

Re: Where should I install this cam?

My question is, what was the cam you were waiting for? Looking in an old Clevite engine parts catalog, their specs for the 1989 302HO replacement cam are a little different than what you found. Part number 229-1774, “SAE” duration 297/279(might be typo?), 210/210@.050, .278/.278 lobe lift, 116ICL/1...
by GARY C
Sun Jul 18, 2021 2:29 am
Forum: Engine Tech
Topic: Port CFM for Simulations
Replies: 48
Views: 1547

Re: Port CFM for Simulations

Hi All I'm running some software simulations for engine development. I've a set of ported Gen 1 SBC heads with a peak intake of ~254 CFM (@.500") That was on a bench with a 4.03 fixture bore. My question is what would be a reasonable value to use as my input criteria once there's an intake manifold...