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Search found 3275 matches

by mag2555
Sun Jun 13, 2021 9:57 am
Forum: Engine Tech
Topic: Looking for opinions on this Crower cam for a Pontiac stroker 400
Replies: 17
Views: 388

Re: Looking for opinions on this Crower cam for a Pontiac stroker 400

Also consider the fact that if those 6X heads are stock then unless you run a super stock roller Cam there done at 5500 with the cid of that stroker motor!

It may rev to 6K, but with a street cam the power climb is long gone!
by mag2555
Sun Jun 13, 2021 7:33 am
Forum: Engine Tech
Topic: Looking for opinions on this Crower cam for a Pontiac stroker 400
Replies: 17
Views: 388

Re: Looking for opinions on this Crower cam for a Pontiac stroker 400

If the TA has a/c then I am pretty sure that 3.42 rear gears where not available in that package. Super T10s in the post 1965 era could be had in both wide and close ratio. I could not open the Cam card info that you posted, but you have made no mention of how the valve train is set up on those 6X c...
by mag2555
Thu Jun 10, 2021 6:21 am
Forum: Engine Tech
Topic: 243 LS SSR...Stumped.
Replies: 31
Views: 1473

Re: 243 LS SSR...Stumped.

Could you please post a photo of the center of your short turn arc formed with a lenght of solder? Two dimensional pictures of something that is 3 dimensional with compound angles are useless! Another way to control short turn velocity is also by manipulation of the short turn, but at the transition...
by mag2555
Thu Jun 10, 2021 6:07 am
Forum: Engine Tech
Topic: Pick a head, any head.
Replies: 24
Views: 929

Re: Pick a head, any head.

There holding you back because there 200 cc port volume is producing less average port velocity which is in turn doing the same to the motors torque band. I would be looking for a head in the 185 to 190 port volume range, or maybe even the trick flow 175 and then do a bowl blend on them. The Trick f...
by mag2555
Wed Jun 09, 2021 6:53 am
Forum: Engine Tech
Topic: Offenhauser intake manifolds
Replies: 28
Views: 986

Re: Offenhauser intake manifolds

When was the last time if at all you saw a motor running one of these that impressed you?

I know, I came up with zero also!
by mag2555
Wed Jun 09, 2021 6:50 am
Forum: Engine Tech
Topic: 243 LS SSR...Stumped.
Replies: 31
Views: 1473

Re: 243 LS SSR...Stumped.

The question needs to asked how much power does this student need to make, since 290 cfm is good for 600 hp. Whatever you do in reaching for greater higher lift flow you do not want to degrade that 150 cfm @ .200” lift ! That is a nice fat number and will help to keep the max HP made from nosing ove...
by mag2555
Tue Jun 08, 2021 5:59 am
Forum: Engine Tech
Topic: 243 LS SSR...Stumped.
Replies: 31
Views: 1473

Re: 243 LS SSR...Stumped.

Here's info I doug up from the last set that I did which went 315 cfm.
by mag2555
Mon Jun 07, 2021 7:17 pm
Forum: Engine Tech
Topic: Crane Fireball heads
Replies: 15
Views: 5097

Re: Crane Fireball heads

300 cfm, even 290 cfm if there are based a factory Chevy casting means that even the act of bolting then on could crack them!

And the reversion, dirty intake, combustion inefficiency and big delay in the start of the torque band caused by those round exh ports is criminal!
by mag2555
Mon Jun 07, 2021 6:21 pm
Forum: Engine Tech
Topic: 243 LS SSR...Stumped.
Replies: 31
Views: 1473

Re: 243 LS SSR...Stumped.

Are you flow testing with the intake manifold that will be in use bolted on? The air volumes needed to kick in the turbulence over the short turn may not take place, or may only take place at a higher lift then what will be run with the intake in place during a flow test. Is your short turn basicall...
by mag2555
Mon Jun 07, 2021 5:57 am
Forum: Engine Tech
Topic: Why are these holes made in crankshafts?
Replies: 27
Views: 1450

Re: Why are these holes made in crankshafts?

X2 with the above! If that rod journal was solid then the counter weight 180 degrees opposite it would need to be larger also . Rotating mass besides loading the block bearings and main caps more also eats up hp just like the mass of your tires, rims, brake rotors and internal transmission and diffe...
by mag2555
Sat Jun 05, 2021 10:33 am
Forum: Engine Tech
Topic: 193 Swirl Port Porting Question
Replies: 24
Views: 932

Re: 193 Swirl Port Porting Question

Just keep in mind one thing, that being that flow exiting the port does not swirl all the time! At low flow rates , up to maybe .300” lift the flow is taking the path of least resistance or as much of a straight line as it can into the runner and out of the valve. This action is kind of like a teete...
by mag2555
Sat Jun 05, 2021 6:20 am
Forum: Engine Tech
Topic: 193 Swirl Port Porting Question
Replies: 24
Views: 932

Re: 193 Swirl Port Porting Question

So what size is the throat now( stock) ? With that narrow of a lip I would not reduce it by more then .015” to gain a bigger throat diameter if your keeping that lip there. If you where inclined to spend some money then the way to go would be to put intake seats in the heads and get that lip out of ...
by mag2555
Fri Jun 04, 2021 4:23 pm
Forum: Engine Tech
Topic: 193 Swirl Port Porting Question
Replies: 24
Views: 932

Re: 193 Swirl Port Porting Question

My question is how wide is that step? Here’s why, with no bottom cut below the 45 there needs to be something there like that lip to somewhat act as a bottom cut. In keeping with this line of thinking I would then open up the throat until that 90 degree lip had only .045”or .050” left to it. The big...
by mag2555
Wed Jun 02, 2021 4:32 pm
Forum: Engine Tech
Topic: Pump gas 421 SBC HP
Replies: 37
Views: 1952

Re: Pump gas 421 SBC HP

It’s a well needed starting point with the compression this motor is built with, yes!
by mag2555
Wed Jun 02, 2021 4:01 pm
Forum: Engine Tech
Topic: Pump gas 421 SBC HP
Replies: 37
Views: 1952

Re: Pump gas 421 SBC HP

Do you have the uncorrected numbers?

I was assuming the heads are stock and flowing about 240 cfm@ .460” lift, that 507 hp is much closer to 250 cfm it would seem.