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Search found 4966 matches

by GARY C
Mon Sep 14, 2020 9:23 pm
Forum: Engine Tech
Topic: Intake manifold porting
Replies: 11
Views: 804

Re: Intake manifold porting

From everything I have seen on this subject most single plane intakes are sized for a 4500 to 7000/8000 ish rpm range so any cross section increase will only favor upper rpm ranges. Maybe CGT or randy331 will chime in on their EMC rpm range intake testing. I am sure you know that with out a before a...
by GARY C
Mon Sep 14, 2020 8:52 pm
Forum: David Vizard forum
Topic: The Venturi effect
Replies: 5
Views: 852

Re: The Venturi effect

Joe-71 wrote: > On page 59 of your Theory Book you show a diagram of what at the time was > considered an optimal venturi for a port and valve seat. For many years I > tried to use that diagram to improve my port shape on almost all my work, > and it did increase the airflow when testing on the flow...
by GARY C
Sun Sep 06, 2020 3:10 pm
Forum: Engine Tech
Topic: Watered gas.
Replies: 17
Views: 550

Re: Watered gas.

Old School, That's a dammed good idea! Never thought of it. My red plastic cans do have vents on them so all I need to do is figure out how to put them, "up-right", so they will settle out the water so I can drain it off. pdq67 I always put it in a white racing jug so I can see the water line at th...
by GARY C
Sat Aug 29, 2020 5:09 pm
Forum: Engine Tech
Topic: headers for small overlap cams
Replies: 9
Views: 535

Re: headers for small overlap cams

Isn't there an advantage to exposing the intake tract to this low pressure so as to start the filling process with greater energy? That is to say, with the exhaust and intake in overlap, the suction created by the receding exhaust pulse draws on the intake with greater effect? To get the intake tra...
by GARY C
Thu Aug 27, 2020 9:54 pm
Forum: Engine Tech
Topic: 1 5/8” headers and 500hp?
Replies: 74
Views: 2921

Re: 1 5/8” headers and 500hp?

Suggest anyone not familiar with Calvin Elston's generously insightful postings get onto reading them as a starting point. Seems most folks imagine that their exhaust is bunging up the process in a manner something like constipation does a human. Jere Stahl used to make small diameter long tube hea...
by GARY C
Wed Aug 26, 2020 6:54 pm
Forum: Engine Tech
Topic: 8 to 900 hp out of a 1st Gen. SBC Block.
Replies: 44
Views: 1551

Re: 8 to 900 hp out of a 1st Gen. SBC Block.

I wish they would reproduce an upgraded version of the 400 block but it would probably be over priced for what it would be. THEY do. But "they" is DART. .230" wall thickness; 4 bolt splayed steel main caps, priority mains oiling, no more head bolt holes going into water jackets, pre-stroker clearan...
by GARY C
Wed Aug 26, 2020 6:49 pm
Forum: Engine Tech
Topic: 8 to 900 hp out of a 1st Gen. SBC Block.
Replies: 44
Views: 1551

Re: 8 to 900 hp out of a 1st Gen. SBC Block.

travis wrote: Wed Aug 26, 2020 6:10 pm Doesn’t Blueprint make new 400sbc’s as well?
Yes, $1600.00
by GARY C
Wed Aug 26, 2020 2:26 pm
Forum: Engine Tech
Topic: 1 5/8” headers and 500hp?
Replies: 74
Views: 2921

Re: 1 5/8” headers and 500hp?

Will a 1 5/8” header support 500+ HP without completely choking it to death? Application will be a 408 sbf. Unfortunately for us truck guys there are no reasonably priced options for larger tubes (that I know of). SBF 1 3/4” tubes or larger typically go to a different flange bolt pattern, of which ...
by GARY C
Tue Aug 25, 2020 8:24 pm
Forum: Engine Tech
Topic: 8 to 900 hp out of a 1st Gen. SBC Block.
Replies: 44
Views: 1551

Re: 8 to 900 hp out of a 1st Gen. SBC Block.

The ugly Luv in the far lane at 21:44 in the vid is a stock block, stock cast crank, stock rod, forged piston 350 with a flat tappet hyd cam Comp 262XE with a Protopline reproduction head 167cc, Air Gap intake, 750 vac secondary carb and nitrous. https://www.youtube.com/watch?v=jmp_pJziQpI What's t...
by GARY C
Tue Aug 25, 2020 7:35 pm
Forum: Engine Tech
Topic: 8 to 900 hp out of a 1st Gen. SBC Block.
Replies: 44
Views: 1551

Re: 8 to 900 hp out of a 1st Gen. SBC Block.

I have posted these before but in the context of the thread I thought I would repost. Roy's car is the first in the video, blue Chevy II https://www.youtube.com/watch?v=TTi71uG5BL8 The ugly Luv in the far lane at 21:44 in the vid is a stock block, stock cast crank, stock rod, forged piston 350 with ...
by GARY C
Tue Aug 25, 2020 7:11 pm
Forum: Engine Tech
Topic: 8 to 900 hp out of a 1st Gen. SBC Block.
Replies: 44
Views: 1551

Re: 8 to 900 hp out of a 1st Gen. SBC Block.

And yes, as Gary said, it's hard to find good blocks. 15-20 years ago it was hard for us (and we had an ample supply from our dealership's core pile!), I can only imagine how hard it is now. Not going to be at all difficult. GM just put the 350"s back into production. https://www.autotimesnews.com/...
by GARY C
Tue Aug 25, 2020 5:34 pm
Forum: Engine Tech
Topic: 1 5/8” headers and 500hp?
Replies: 74
Views: 2921

Re: 1 5/8” headers and 500hp?

Will a 1 5/8” header support 500+ HP without completely choking it to death? Application will be a 408 sbf. Unfortunately for us truck guys there are no reasonably priced options for larger tubes (that I know of). SBF 1 3/4” tubes or larger typically go to a different flange bolt pattern, of which ...
by GARY C
Tue Aug 25, 2020 2:02 am
Forum: Engine Tech
Topic: 8 to 900 hp out of a 1st Gen. SBC Block.
Replies: 44
Views: 1551

Re: 8 to 900 hp out of a 1st Gen. SBC Block.

The biggest problem I see with production blocks now days is that the majority of the good ones have been consumed.
by GARY C
Mon Aug 24, 2020 8:27 pm
Forum: Engine Tech
Topic: Nitrous Softening
Replies: 7
Views: 378

Re: Nitrous Softening

Looking for ideas on how best to avoid wheelspin with a small nitrous shot.(100 hp or less on a 420 hp NA engine.) The car is pretty much has all the traction I can get it, and does well NA, so, unless the N2O comes on gently, it will spin. I would like to avoid using a laptop if I can. That is wha...
by GARY C
Mon Aug 24, 2020 8:23 pm
Forum: Engine Tech
Topic: 8 to 900 hp out of a 1st Gen. SBC Block.
Replies: 44
Views: 1551

Re: 8 to 900 hp out of a 1st Gen. SBC Block.

We always ran production blocks with nitrous 1/8 mile dragrace, Roys 434 dynoed 675 straight motor and he ran 200 too 300 shot of nitrous on a regular bases. Again, horsepower X time. How many times does that 434" fire in 1/8-mile? All I know is he never broke a block in it or the production block ...