C3Paul

Hi

Few of you may know that I am trying to build a 383ci for my 1980.

This engine is going to be +.030, 1986 Roller block, 6” Scat rods, Mahle forged piston, Lunati roller cam, Performer RPM Air-Gap Manifold, RHS Cast Iron 64cc 180cc intake Pro action heads and CR of 9.9:1 with 4-Speed Manual gearbox.

What I would like is car with CRISP/ SHARP Throttle response ‘ the Seat of the pants experience’ between 2000-5500/6000RPM .

As you can see with this cam range between 2000-5800RPM http://www.summitracing.com/parts/LUN-501A4LUN/

Performer RPM intake 1500-6500RPM

180cc heads with small runners, constantly full with charge to about 5500RPM.

I feel that this combination will be what I am looking for.

However, What would I gain if I was going to go with BIGGER ALUMINIUM 200cc intake heads?????

Would I still have the Crisp/Sharp response at 2000RPM as with 180cc heads?

Thank you

l88rocket

How the throttle reacts is more tune up than heads. IMO a 180 head is to small for a 383. I wouldnt use a head any smaller than 195. going bigger with that intake isnt going to make much more power because of the limited air flow in.

BLOCKMAN

If your looking for low end torque the 180 will work but you will sacrifice some top end as those heads and intake will probably be all done around 5000 to 5500 RPM but should have some good street manners.

We just did a 383 short block with a Callies rotator and Mahle pistons and Dart SHP block for a guy on this site and he decided to go with the Dart 180 aluminum heads and he has a standard tranmission.

If your looking for some better torque tighten up the lobe sep and shorten the split up a little.

The hyd. roller we used is as follows

Duration @ .006 281/284
Duration @ .050 230/230
Gross lift is 570/518
Lobe sep of 109

And had the ever wear gear installed as well

I am hope on he installs the heads and intake it may come back to be dynoed as it sould be pretty good peice for street engine.

Good luck with your build Carl

Tumarr

go 200cc or bigger for a 383. I had 215 dart pro ones and they worked fantastic on my 383. low 11's on motor. pulled excellent in the low rpms too.

BLOCKMAN

Those Dart heads are a great and there not priced to bad either!!

MotorHead

Please don't put 180cc heads on a 383ci motor.

BLOCKMAN

Those will work but their sure are better ones out there the ones that are going to be piut on the short block I built will work fine for intended use as he al ready had the heads before he ordered the short block and I would love to have him bring it back for some time on the dyno.

Most of our 383 builds we have used the AFR 195's here are 2 builds I posted on.

Using an air gap with 215 Pro 1's kill the pupose as the CSA is small for those heads.

Look at the second link as both engines were pretty much the same but different intake manafolds.

http://www.chevelles.com/forums/showthread.php?t=106715

http://www.chevelles.com/forums/showthread.php?t=236517

MotorHead

New AFR 195's flow the same numbers as my old 215cc Vic jr's which were actually cc'ed at 219cc and made 550HP on my 406ci, so of course they are a great choice for a 383ci motor

jordan89

Go with AFR heads.

gingerbreadman1977

Gm fastburn would be my choice for a 383

SanDiegoPaul

I used AFR 195's when I decided to change out my iron heads on my 383. While I got crisper low/midrange throttle response with the old heads, the 195's with 65cc chambers really opened things up on the high end. I picked up 35hp at the wheels and a lot more torque.

It runs so good that I very rarely miss the crispness it had using the 72cc cast iron heads that were ported & polished when I built the motor originally.

BLOCKMAN

x2!!!!!!!

C3Paul

Thank you,

Well, the 180cc's are for sale now and bigger ALUMINIUM 200cc are on the way home.

How about my intake.

Should I stick with the Performer RPM Air Gap?

Here is an interesting article about 383ci build with different size heads:
http://www.chevyhiperformance.com/te...est/index.html

28buick

Just clarifying Blockmans earlier post on the shortblock he just finished for me. The heads are AFR 180 not Dart. Future plans include a head upgrade but I decided at this time to put my money into a shortblock that would take anything I could throw at it. I must say Carl does very nice work and that SHP block with the Callies rotator is a piece to behold. When I picked up the shortblock there was not a burr to be found anywhere on the block or components. Even the balancing spots on the counterweights had been champhered. Not the slap it together stuff I have experienced in the past. Nice job and thanks Carl.

BLOCKMAN

MY bad as I have Dart on the BRAIN and thanks for the postive comments and I really think you will be very happy with your build

glen242

My 383:

CC XE274H cam, RPM intake, TF 23* 195cc heads, 10.3 static CR. On bang per buck, I would recommend the TF heads (64cc).

I run 89 octane BP gas, without a problem!

MotorHead

I really think that test is flawed. You need to match components and just slapping different size heads ( some with 64 and some with 72 cc combustion chambers ) heads on the same engine with the same cam is not a very intelligent way of testing anything, JMHO

The RPM AIr gap is a very good intake, not sure about the Performer Air gap