4-30-20 day for the 430 CanAm aluminum big block Chevy

[JoeC]

found this interesting article THE HISTORY OF MOUNTAIN MOTOR PRO STOCK


The article says ...

“In those early days it was really hard to find the blocks, so you did whatever you could to make the engines bigger,” Leonard said. “The camshafts – you’d put more stroke into it and your rods would hit the camshafts. It was a headache.”

http://www.competitionplus.com/drag-...otor-pro-stock

[Carleen]

Heavy also had CanAm Engines

[Vortecpro]

Originally Posted by JoeC

I'm not an expert on the 1970 NHRA rules but read that 1970 Pro Stock was run on 7 HP per pound so the 430 Chevy could run in a 3010 lb Camaro.

by 1971 they were going into the mid 9s in NHRA Pro Stock so were making pretty good power on gas with tunnel ram 2x4bbs

the online ET-MPH-HP calculator says " Your HP is 693.88 computed from your vehicle weight of 3010 pounds and ET of 9.50 seconds"

The 430 CamAm engines were making good power also here is a youtube vid
Dyno Testing - 1973 McLaren Can-Am Big Block Chevy
where it pulls 750hp

They don't say if its a 430, 465, or 495 cu in engine

https://www.youtube.com/watch?time_c...ature=emb_logo

I don't know what MPH a 430 inch Pro Stock ran back in the day, but HP is calculated by MPH over 1320 feet, and 139 MPH for example is 622 HP @ 3010 pounds. I would find it very hard to believe 1970 Pro stocks made over 700 HP on todays dynos, but the tunnel ram does help.


Although, 149.7 is over 770 observed crankshaft HP @ 3010, based on the information on page 4. Typically a A/S 375 HP 396 makes 620s for HP on my dyno, can run 9.80s @ 3450 @ 135 MPH. So a factory ZL1 making 601 seems very reasonable to me, although I'd like to see the 7300 RPM peak myself, seeing the 375 HP stocker peaks just under 7000 RPM but is run to 7800 RPM plus.

[JoeC]

the NHRA Pro Stock records are

1970 144.48 mph

1971 146.10 mph

1972 149.50 mph

I put 700 hp and 3010 lbs in the calculator and came back with ...
Your ET / MPH computed from your vehicle weight of 3010 pounds and HP of 700 is 9.47 seconds and MPH of 142.68 MPH.

[Vortecpro]

Originally Posted by Flying Undertaker

That picture shown is of the replacement 430 cu. in. 360hp Buick engine built for 1967-1969 Buicks before going to 455 Cu. in. Buick engine of the same design. It was a totally different design departure from the earlier Nail Head Buick engines.The Last year for a Nail Head Buick was 1966 at 401 cu. in. However, your statement that Buick engines had torque in spades is quite true.

TQ.......does not win drag races, hi RPM HP wins drag races................Example

https://youtu.be/YvEwFnPx8rs

[Vortecpro]

Originally Posted by JoeC

the NHRA Pro Stock records are

1970 144.48 mph

1971 146.10 mph

1972 149.50 mph

I put 700 hp and 3010 lbs in the calculator and came back with ...
Your ET / MPH computed from your vehicle weight of 3010 pounds and HP of 700 is 9.47 seconds and MPH of 142.68 MPH.

The question is are you using the right calculator? You can't go wrong with the Moroso power speed calculator, lines right up with my dyno/track testing.
Take a look at this MPH calculator its close. http://www.wallaceracing.com/et-hp-mph.php


I get 707 HP for 145 MPH @ 3010, big power back in 1970!

[EZ Nova]

Joe and Mark, one main issue is that the MMPS and "Match races" were not at 3000+ lbs? They took the weights out, used bigger engines and ran them! This why the 1970 times were 9.90 or there abouts and the Match racers were around 9.40's.

Don't forget that most of the cars in 72 were small blocks and lighter, not the 3000+ lbs like the 70/71 years.

So to use the 144+ MPH is NOT the 427430 inch motors? These were the match race 490/500+ inchers that ran light.

Just putting the MPH/Weight ratio into prospective.

[JoeC]

DragList shows numbers for "Pro Stock Classic" with a 430 cu in limit and "Pro Stock Mountain" with a 500 cu in limit

I was using the record numbers for PS Classic


example for 1971 they show ...

PS Classic 1971 Records: 1/4 Mile: 9.485 ET, 146.10 MPH

PS Mountain 1971 Records: 1/4 Mile: 9.265 ET, 149.76 MPH

[JoeC]

its difficult to keep track of all the rules as they changed them a few times

here is a one quote ...

"In 1982, the NHRA did away with the weight break system and implemented a 2,350 pound minimum weight, 500 cubic inch maximum rule across the board, due to the popularity of the Mountain Motor IHRA Pro Stock cars, which have unlimited displacement."


I remember reading that the engine displacement was well over 500 cu in with the tall deck blocks. At one time they called them "car blocks" and "truck blocks" and the tall deck blocks had to carry a 100 pound weight penalty

in 1972 some people were still running 1969 Camaros as you can run a car up to 3 years old

[RobR]

Originally Posted by Vortecpro

TQ.......does not win drag races, hi RPM HP wins drag races................Example

https://youtu.be/YvEwFnPx8rs

Is that Kip Martin in the mustang? If so he was one of the very best with Ford engines. Years ago he could wring out the horsepower on a 352FE like no other.