[uneasyrider]

I have understood that the stock block is only good for around 700-800hp I guess I'm wondering if a 900hp+ stock Ponch would last more than a few passes? Would that cryo freeze thing need to be done to it first?

Uneasyrider

[Half-Inch Stud]

Does a front & rear engine mount plate keep the fractures away?

[uneasyrider]

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Half-Inch Stud:
Does a front & rear engine mount plate keep the fractures away? <HR></BLOCKQUOTE>

A conventional Pontiac engine block isn't designed to be a structural member in the chassis of the car. The plate is to locate the engine in the car for better torque transfer by eliminating the flex in the engine mounts. The cracks in the block are caused from the internal stresses of the torque transfer through the block. If I remember correctly Pontiac's generally fail through the lifter galley and split lengthwise down the block. Think of the engine block as a brittle pop can and you grab the ends and twist it when you floor it.

Uneasyrider

[65nss4spdGTO]

Originally Posted by fastgoat

Has anyone out there made 2 hp/cu in. with a stock block normally aspirated Pontiac on race gas? Or with an aftermarket block? Documented (dyno sheets)?

I good thread from 2005, where are we now?

Calvin Hill
Hill Performance
708-250-7420

[john marcella]

Originally Posted by fastgoat

Has anyone out there made 2 hp/cu in. with a stock block normally aspirated Pontiac on race gas? Or with an aftermarket block? Documented (dyno sheets)?

Im 99hp past 2 per CID right now on the dyno and still have work to do, and i think its a P.O.S. so far

[john marcella]

Originally Posted by 65nss4spdGTO

I good thread from 2005, where are we now?

Calvin Hill
Hill Performance
708-250-7420

LOL, i didnt even notice the date of when this tread was started.

[fastgoat]

I made 889.4 with 445" - 1967 400 block with 990 crank and Wenzler Super Chiefs in 2004. That's 1.998. Went 5.45 @ 126 in eighth @2790#. I have dyno sheets and timeslip. Coincidentially, the heads and tunnel ram a I just listed the heads and tunnel ram in the parts section

[NHRASuperStock455SD]

Originally Posted by fastgoat

Has anyone out there made 2 hp/cu in. with a stock block normally aspirated Pontiac on race gas? Or with an aftermarket block? Documented (dyno sheets)?

We made 860HP for 440 cubes with a stock block in 1982. It went 146mph in a 3450 lb car for back up calculations. This was with old chassis efficiency heavy wheels, tires, anladder bars heavy drums, cast iron heads, no flow bench. With just fuel we have today we would have gotten at least 880 for 2HP per cubic inch. This was a stock block and we shifted at 9600 RPM.

We used this same block and crank in Stacy's Grand Am until 2010.

The new RAV engine being done must be 2.9HP per cubic inch to be on top 2.7 to be competitive. With our existing ports 2.7 for this engine is very capable, we must work very hard to get 2.9. We will post this project as it happens.

I think a mild set of RAV heads on a stock block 400 is worth 2HP per cubic inch.

[vin63]

Originally Posted by uneasyrider

I have understood that the stock block is only good for around 700-800hp. I guess I'm wondering if a 900hp+ stock Ponch would last more than a few passes?

It depends on the generation of block, how you machine it, and your tune. I routinely make ~1500 bhp and have run the same three factory blocks for the last 5 years. One gave up the ghost last year when we had a lean-out condition from a return poppet spring failure.

[Tim Corcoran]

The question was NA stock block on gasolene

[Tom Vaught]

In 1971, my buddy Gordon, with "Diamond" RA-IV heads and a 366 Engine was CLOSE at 706 HP at 8500 rpm. He needed to make 732 hp to be at 2 hp per cubic inch. The engine had a tunnel ram and two 660 center squirters, but was NA on race gas.

Tom Vaught

ps Marcella in another thread made over 2 HP per cid with his 481 engine.

[vin63]

Originally Posted by Tim Corcoran

The question was NA stock block on gasolene

Answering the question quoted. I have 30+ passes on the stock 400 block that is in the car now - same block we ran in '09 through this past Pontiac Heaven - this block has more than 10 sub 7.50 et runs in a 2800+ lbs car. Why wouldn't that have relevance to the question from uneasyrider? Not sure I follow.

[Tom Vaught]

Naturally Aspirated Engine, not a Boosted Engine?

Tom Vaught

[vin63]

Originally Posted by Tom Vaught

Naturally Aspirated Engine, not a Boosted Engine?

Tom Vaught

The question from uneasyrider was could a factory block hold up to 900+ bhp. Is there more stress on the block from 900+ bhp naturally aspirated vs. 900+ bhp supercharged? Not sure I understand...where in post #21 does uneasyrider specify naturally aspirated over boosted? My apologies if I missed it.

[john marcella]

Originally Posted by vin63

The question from uneasyrider was could a factory block hold up to 900+ bhp. Is there more stress on the block from 900+ bhp naturally aspirated vs. 900+ bhp supercharged? Not sure I understand...where in post #21 does uneasyrider specify naturally aspirated over boosted? My apologies if I missed it.

A supercharged motor at same power level has WAY WAY WAY more stress on the block because the blower takes power to drive, a lot of power to drive, as well as transferring a bunch of harmonics to the crank.

[vin63]

Originally Posted by john marcella

A supercharged motor at same power level has WAY WAY WAY more stress on the block because the blower takes power to drive, a lot of power to drive, as well as transferring a bunch of harmonics to the crank.

That was kind of my point...

[Tom Vaught]

Originally Posted by fastgoat

Has anyone out there made 2 hp/cu in. with a stock block normally aspirated Pontiac on race gas? Or with an aftermarket block? Documented (dyno sheets)?

This is the ORIGINAL POSTERS (fastgoat's question). NATURALLY ASPIRATED.

Uneasyrider added a second question in the middle of the thread.

You answered Uneasyrider's part of the question but not the original question.

Tom Vaught

[RAIV-Z]

Originally Posted by NHRASuperStock455SD

We made 860HP for 440 cubes with a stock block in 1982. It went 146mph in a 3450 lb car for back up calculations. This was with old chassis efficiency heavy wheels, tires, anladder bars heavy drums, cast iron heads, no flow bench. With just fuel we have today we would have gotten at least 880 for 2HP per cubic inch. This was a stock block and we shifted at 9600 RPM.

We used this same block and crank in Stacy's Grand Am until 2010.

The new RAV engine being done must be 2.9HP per cubic inch to be on top 2.7 to be competitive. With our existing ports 2.7 for this engine is very capable, we must work very hard to get 2.9. We will post this project as it happens.

I think a mild set of RAV heads on a stock block 400 is worth 2HP per cubic inch.

I have a set of McCarty\BES ported CNC RA-V heads; according to the dyno sheet they made 660hp on a 535cid. Are you saying all I need to do is change the cam and increase the compression a bit in order to make 1070hp? I currently have 9.1 to 1, what would I need for a cam and compression ratio to hit over 1K hp?

[pastry_chef]

Originally Posted by RAIV-Z

I have a set of McCarty\BES ported CNC RA-V heads; according to the dyno sheet they made 660hp on a 535cid. Are you saying all I need to do is change the cam and increase the compression a bit in order to make 1070hp? I currently have 9.1 to 1, what would I need for a cam and compression ratio to hit over 1K hp?

If you can make peak HP above 7500 RPM, approaching 8000 RPM .. > 1000 HP *should* be possible with 11 to 1 compression.

Ideally I'd want around .950 lift at the valve. If your heads have the CSA and run around 450 CFM or better on a flowbench? and intake/carb to match requirements.

[RAIV-Z]

Originally Posted by pastry_chef

If you can make peak HP above 7500 RPM, approaching 8000 RPM .. > 1000 HP *should* be possible with 11 to 1 compression.

Ideally I'd want around .950 lift at the valve. If your heads have the CSA and run around 450 CFM or better on a flowbench? and intake/carb to match requirements.

Unfortunately they don’t flow anywhere near 450cfm, the intake at .950 lift peaks at 388cfm.