Corbrastang

Do i want to use

1. Edelbrock Performer RPM 170cc heads, 64cc

2. Edelbrock Victor Jr 215cc heads, 64cc

3. Or AFR 195cc heads with, 68cc

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Sky65

The guys over on the Hotrod forum seem to llike the AFRs.

http://hotrodders.com/forum/

SPLITRAY

Duntov,
"Engine Factory" is getting 450 HP out of their 383's with 170cc Edelbrock 6089 Perf. RPM heads.

Corbrastang

I know i love my AFRs on my 302 in my cobra, but i found a set of victor jrs for around 800 new and i think i should jump on it.

Sky65

Look around here. http://www.ryanscarpage.50megs.com/combos1.html

Here's a couple from the AFR site.

Dyno Test Criteria
Horsepower:500 HP
383ci
AFR Street 195 Cyl. Heads
9.5 comp
Holley 0-4779 750 cfm
MSD Distributor 36° Timing
Comp Cams 12-433-8 Hyd Roller Cam
1 3/4" Headers
93 Octane Pump Gas
Engine built and dyno tested by American Speed
ultilizing an Edelbrock RPM Performer Manifold

Dyno Test Criteria
Horsepower: 500 HP
Super Chevy 383ci High School Hot Rod
AFR Street 195 CNC Competition Heads
9.4 comp
BG Silver Claw 750 Carb. with 75/83 Jets
MSD 85551 Distributor 36° Timing
Comp Cams 12-433-8 Hyd Roller Cam
1 3/4" Headers
93 Octane Pump Gas

Engine built and dyno tested by American Speed
ultilizing an Edelbrock RPM Performer Manifold

Corbrastang

Camshaft
Duration 234/238
Lift
.539/.548

achapman

I used AFR 195's on my 383, it was a real screamer of an engine....

Cruz59

Did some calcs, here are the results, CR=10, cam: LSA=110, installed at 106:

1. Edelbrock Performer RPM 170cc heads, 64cc
HP: 441@5000..............393@2500.......... ...(429@5500)
TQ: 484@4000..............187@2500.......... ...(481@4500)

2. Edelbrock Victor Jr 215cc heads, 64cc
HP: 460@5500..............381@2500
TQ: 484@4500..............182@2500

3. Or AFR 195cc heads with, 68cc
HP: 475@5500..............381@2500
TQ: 498@4500..............182@2500

Below 4500 Edelbrock RPM's have more torque, but above that they fall on their nose.

AFR's have more power than Jr's all the way through the RPM-range.

AFR is a winner for maximum power and torque, as well as avg. HP and TQ.

Cruz59

Scott Marzahl

I just read where the 195s intake ports were designed in mind with using a Victor Jr intake. AFR just came out with a new model too. Bottom line, if you pursue AFR, I would check with AFR depending upon which intake and exhaust you plan on using.

Johns_65Vette

Wanna get a crate 383 next year

SPLITRAY

Where did you run off to Duntov?

NedP1

Cobra, the lift and duration numbers on the cam you intend to use sound the Edelbrock Performer RPM roller.

I might go with the Victor Jr. heads. You can lose some at the low end with a 383.

Intake, Vizard uses the Victor intake on about all his engines. The Race 383 in built for 3K makes 550HP if I remember right.

The David Vizard book is How to build max performance Chevy small blocks. At the end of the book he describes the build and dyno testing he did on ten good engine combos.

I don't see the manifold listed anymore - perhaps replaced with the airgap manifold

Plastic Pig

Duntov has left the building.


I know it can make 450 with AFR 170's. I made 470 something with a set of 30+ year old 292 Chevy castings on the first 383 I built. A 327 with 450 HP is impressive.... a 383 average. If your building it from scratch 550 streetable HP is easily attainable with proper component selection. The reality is.... if you are only looking for 450 hp you can get a set of GM vortec heads for half the price of the AFR's and still meet you goals.

A vague question was asked, I asked for details, none were given, and my opinion on 170's being small for a 383 was brought into question because a place someone bought an engine from used 170's to make 450 HP with a 383. Then the original poster said he was probably buying a set of Victor Jrs. based on price anyway. What's the point of posting in these threads ?

I'll let the experts with all the experience hash it out and stick to offering help posting pictures.

Corbrastang

I appreciate all opinions. Not sure what i will go with in the end. The heads i was thinking about buying, victor jrs turned out to be bare, so.....
Thanks for the help Duntov!!!

Toss up between the AFRs and the Victor Jrs would be my guess. Will depend on price in the end.

Plastic Pig

Not a problem.... Glad I could help.

65air_coupe

This is very interesting to me as I'm going to build a 383 soon myself and planned on using the existing heads, intake and exhaust. I'm not after high numbers, only replacing my original block as a matter of prudence and while I'd probably be happy with a warmed over 350, it seems building a 383 from scratch is just as easy. Since my heads are not original, but period correct and I just put new valves and hardened seatd (exhaust only) in them, I thought I'd just use them, maybe with a pocket port job tho.

The intake is a Performer with a BG 650 and exhaust is Hedman headers. I have't selected a cam yet but probably with go with a hydraulic.

Do you feel like I'd be that much better off to find a set of Vortec heads instead?

Corbrastang

Heads are where you will gain the most power. Not to mention aluminum heads will save you around 60pds up front.

65air_coupe

This engine change isn't really about gaining power tho, I'm only doing a 383 as it appears to be as easy as putting together a moderately high performance 350.

And I can appreciate saving weight too, but don't see that as a very high priority either. What I'm trying to do is avoid the well known 'ripple effect' that so often happens when we start one of these projects! Before you know it I'll be swapping out my new front suspension for a mono-leaf version to save a little more weight 'while I'm at it'!

You know the way it starts....let's see, I've got the engine out which makes swapping out the A-arms so much easier! And while I'm at it, I might as well put new synchros in the tranny.......gee if I'm spending that kind of money, might as well go for the 5 speed, after all, I'm making more horsepower plus will probably drive it more once I don't have to worry about damaging the original block...etc, etc!

Johns_65Vette

BTDT Trying not to do it this time, with this car

King Lear

170's are too small for 383, etec 200 for 383

He's right, I talked to edelbrock last week and they stated use the 200 etec on a 383. I would go with any vortec head over a regualr head, they just are more powerful on the dyno's. Personally, I like RHS, but heads are like cams and carbs, everyone is partial to some brand. I do know people have had problems with trick flow's valves hitting on the stroke, so I would avoid them.