What Combo?????????????

[Paul Precht]

Originally Posted by Bob Mulry

WOW.....ALL I CAN SAY IS WOW...

750 CFM AFB
10.0 : 1 compression
203cc Intake runner


280HP with a stock head
285HP with an Edelbrock Aluminum Head


WOW...

This engine has some things working against it. The carb on my bench flows 566 CFM, the near 0 deck height and .020" gasket combined with a small block like stroke make any cam with even modest duration difficult to fit. Before the 383s were defactored there were not any single 4 barrel 383 Stockers out there with maybe a rare exception. The 383 is Mopar's most common engine, it's what the 350 is to Chevy. For many years a Mopar racer had to run a Hemi, a Max or 6 Pak car to be competitive with a big block, all expensive combos as well as the cars they came in, thankfully that has changed.

[Mark Yacavone]

Certainly would agree they needed some help.
Similar 389 / 400 Pontiacs are in the 325 - 330 range.
Of course, those who were around in the 60's already know and understand that.

[Bruce Fulper]

Originally Posted by Mark Yacavone

Certainly would agree they needed some help.
Similar 389 / 400 Pontiacs are in the 325 - 330 range.
Of course, those who were around in the 60's already know and understand that.

Not the '65 tri-power 389. It's still at 360 hp. Because they allowed the '62 318 hp tri-power down to 280 (H/SA) I've been requesting the '65 tri power to get within 10 hp of that. There's not enough difference in the two to shake a stick at. .007 more lift. Same carbs. 1.88 v/s 2.02 intake valve. That's it. Two years I've been trying. They won't budge on it. Don't feel real happy about building the car and giving them data for a year or two to prove it. But I gotta dream. The only '65 GTO tri power 4 speed in Stock.

[Mark Yacavone]

Originally Posted by Bruce Fulper

Not the '65 tri-power 389. It's still at 360 hp. Because they allowed the '62 318 hp tri-power down to 280 (H/SA) I've been requesting the '65 tri power to get within 10 hp of that. There's not enough difference in the two to shake a stick at. .007 more lift. Same carbs. 1.88 v/s 2.02 intake valve. That's it. Two years I've been trying. They won't budge on it. Don't feel real happy about building the car and giving them data for a year or two to prove it. But I gotta dream. The only '65 GTO tri power 4 speed in Stock.

Can't have too much variety, I guess.
Only room for Camaros now.

There's another way to go about this.
Bring it out and go slow. No heads up runs around in Div 7 now.
Love to see it.

[Billy Nees]

Originally Posted by Mark Yacavone

Can't have too much variety, I guess.
Only room for Camaros now.

And, apparently, old Mopars!

[James L Miller]

Originally Posted by Billy Nees

And, apparently, old Mopars!

Can someone get another intake approved for Billy? He said he had a one year only intake. I can sympathize with that. Hard to find one year only parts. Best of luck Billy.

[Billy Nees]

Don't worry James, I'll make due. I knew what I was getting into when I built the combo and I'll get by without any "outside help".

[Chris Barnes]

We ran this combination. The carb is the tiny 525 and there is no new carb replacement, if you look at a "modern" 525 AFB you will see why. The old ones aren't common but we found a couple and sent them off to Dean Oliver, who did a magnificent job making us one bad boy race carb. NHRA allowed us to use a later model Road Runner intake manifold, which we found to be way better than the '66 piece. We ran our '66 Belvedere in H/SA. It ran mid 11's and got eaten alive by more "affluent" racers in 350 Camaros but it seemed like the combination had a lot of potential. I think the new lifter rule would help at least a little bit.

[Dwight Southerland]

Originally Posted by Bruce Fulper

Not the '65 tri-power 389. It's still at 360 hp. Because they allowed the '62 318 hp tri-power down to 280 (H/SA) I've been requesting the '65 tri power to get within 10 hp of that. There's not enough difference in the two to shake a stick at. .007 more lift. Same carbs. 1.88 v/s 2.02 intake valve. That's it. Two years I've been trying. They won't budge on it. Don't feel real happy about building the car and giving them data for a year or two to prove it. But I gotta dream. The only '65 GTO tri power 4 speed in Stock.

'66 389/335/300 is not bad. Uses the same head that was developed for the 421/376. 12.0:1 compression. 625 cfm AFB. Not a killer, but at least competitive.

[426Fred]

Originally Posted by Paul Precht

This engine has some things working against it. The carb on my bench flows 566 CFM, the near 0 deck height and .020" gasket combined with a small block like stroke make any cam with even modest duration difficult to fit. Before the 383s were defactored there were not any single 4 barrel 383 Stockers out there with maybe a rare exception. The 383 is Mopar's most common engine, it's what the 350 is to Chevy. For many years a Mopar racer had to run a Hemi, a Max or 6 Pak car to be competitive with a big block, all expensive combos as well as the cars they came in, thankfully that has changed.

Couldn't agree with you more Paul. 280 may look low but the carb and limited cam selection definitely still hampers the 383