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Search found 3001 matches

by mag2555
Thu Jul 09, 2020 7:19 am
Forum: Engine Tech
Topic: Exh flow
Replies: 0
Views: 124

Exh flow

Would anybody find a problem with running this ported Exh in a Ford E7TE-PA casting if it peaked in flow at only .400" lift and the Cam to be run was going to hit .600" lift after lash? The valve this port was tested with is a 1.57" with no back cut yet so the low lift flow numbers will still come u...
by mag2555
Thu Jul 09, 2020 6:00 am
Forum: Engine Tech
Topic: olds 307 build
Replies: 12
Views: 412

Re: olds 307 build

Those heads stock peak in Intake flow at .500" lift with about 180 cfm@28". This could produce 370 hp but you would need far more valve lift and like a 12 to 1 compression to get to 370 hp! Your going to need more then 4.56 rear gears also, you need to looking into the 5 something gear area. Your go...
by mag2555
Mon Jul 06, 2020 6:53 am
Forum: Engine Tech
Topic: BBC connecting rods
Replies: 7
Views: 373

Re: BBC connecting rods

Back then GM ruff matched the Rods weight wise and then once assembled spun up the whole darn short block to balance the motor ( yes, your reading that right, they spun up the whole thing! ) which was only to a low tolerance so that on average the motor felt good to the average driver and did not ta...
by mag2555
Fri Jul 03, 2020 8:50 am
Forum: Engine Tech
Topic: "L98 valve spacing"
Replies: 22
Views: 683

Re: "L98 valve spacing"

It's the first Corvette Aluminum head based on the standard iron heads.
by mag2555
Fri Jul 03, 2020 6:20 am
Forum: Engine Tech
Topic: "L98 valve spacing"
Replies: 22
Views: 683

Re: "L98 valve spacing"

I don't recall the numbers, but that's not a very beefy head to begin with if your thinking of moving the valve centers on, especially when there ported and on a motor making 430 hp or more your asking for trouble! With all the aftermarket heads out there today at your disposal, why would you be thi...
by mag2555
Mon Jun 29, 2020 6:10 am
Forum: Engine Tech
Topic: Opinions on my street 427 Windsor dyno results?
Replies: 21
Views: 773

Re: Opinions on my street 427 Windsor dyno results?

Real nice wide Torque band, but with what that motor has for heads and Cam I would think it would be cracking the 500 hp mark!

I would think about changing over to a single plane Intake with even just a 750 cfm Carb if you want HP numbers above where your are now.
by mag2555
Sun Jun 28, 2020 5:52 am
Forum: Engine Tech
Topic: 540 not showing power
Replies: 24
Views: 1012

Re: 540 not showing power

With that size motor and the weight of that car it should be bunch faster!

I don't think your making enough average cylinder pressure as was posted with a Cam of those duration numbers, also 740 hp should only take some 330 cfm to make and those 345 cc heads should be flowing a bunch more then that!
by mag2555
Thu Jun 25, 2020 6:12 am
Forum: Engine Tech
Topic: predicting cranking compression
Replies: 31
Views: 993

Re: predicting cranking compression

The Cams spec a the quality of the build has a huge impact on cranking numbers!
by mag2555
Wed Jun 24, 2020 5:35 am
Forum: Engine Tech
Topic: Port work on a Fiat 124 2L head
Replies: 9
Views: 353

Re: Port work on a Fiat 124 2L head

If I where you I would really want to get the head flow tested now so you know what the Exh to intake ratio has changed to! On the few of these motors I have worked on ( flow wise at a shop I used to help out at) even with the head in stock form then intake Manifold was the main choke point in the w...
by mag2555
Tue Jun 23, 2020 7:20 am
Forum: Engine Tech
Topic: Port work on a Fiat 124 2L head
Replies: 9
Views: 353

Re: Port work on a Fiat 124 2L head

Those Exh port outlets at the flange look really big for that throat size I see in those Exh port bowls! I would bet that welding up the floors of those Exh runners to make them a tad smaller would pick up bunch of mid range Torque and help the motor to rev faster and not drop off any top end power ...
by mag2555
Tue Jun 23, 2020 7:12 am
Forum: Engine Tech
Topic: 351w valve seats
Replies: 7
Views: 376

Re: 351w valve seats

Intake seats do not need to be any wider then .055" with .040" being minimum as seen on my flow bench provided you have a bottom cut atleast .080" tall. Exh seat wise .065 to .075" is the range I shoot for, and if I am not mistaken those heads have a 15 degree top cut from the factory on both valves...
by mag2555
Mon Jun 22, 2020 12:25 pm
Forum: Engine Tech
Topic: Early prostock iron heads.
Replies: 41
Views: 2457

Re: Early prostock iron heads.

Boy that's massive sheer taking place on the Intake side going from 368 cfm down to 344!
by mag2555
Mon Jun 22, 2020 6:41 am
Forum: Engine Tech
Topic: Early prostock iron heads.
Replies: 41
Views: 2457

Re: Early prostock iron heads.

With the floor veins in that position it was more to deal with fuel management then air flow I would say!
by mag2555
Fri Jun 19, 2020 12:17 pm
Forum: Engine Tech
Topic: Edelbrock E force heads #5089
Replies: 16
Views: 589

Re: Edelbrock E force heads #5089

X2!
Change out the springs for a good set of Manlys and for sure then confirm your coil bind clearance and retainer to seal clearance both for the lift your choosen Cam has and shoot for 140 psi on the seat.
by mag2555
Fri Jun 19, 2020 6:09 am
Forum: Engine Tech
Topic: Too much oil in sump
Replies: 26
Views: 804

Re: Too much oil in sump

Since your talking about dyno results and your on a speed site I will asuume your looking for results from rpms up to 5500 or better, not 2000 rpm like the average Diesel! Nothing is carved in stone with results that I have seen due to the verience per motor in the size of the cranks counter weights...