[chuckies76ta]

Gives us your experience on a IA2 build.
4.350 bore 4.25 crank. 10.5 to 11.1 Pump Gas.



What parts and what it would take to build 750 to 800 H/P. Low maintenance. Street/ strip.


Going in a 68 Firebird, 3600 pounds.



I already have a forged 4.25 stroke crank 3" mains
Heads- Thinking High ports.
55 MM Cam- Solid Roller Specs-

Lifters- .904-

Intake-
Carb-


Thanks for your input..

[Dragncar]

You don't need the extra expense of 55mm-.904 to make 750-800HP. 55mm cams are not cheap, but you can get all the lobe swaps not available with std cams. Valve spring last much longer I understand with the big stick.
I am doing one right now (540 pump gas 11.5 CR), well have all the parts except for the cam. AND after my 461 gets done but it is about ready to get assembled.

[AG]

My race motor is an IAII 498 ci (4.32 x 4.25), 11.1 CR with 335 cfm Eddy heads and probably makes close to 700 HP on pump gas with the cam in my sig. Should be easy to make 750-800 with more head and bigger cam. I use a forged crank Eagle 6.800 rods, Ross pistons with a dish, 5.275" 6000 series valves, 240# seat pressure springs, Pro series rocker studs, Smith Brothers 3/8" restricted PRs, Crower HIPPO SR lifters, Crower roller rockers, stud girdle, Victor/Dominator. You might consider shaft rockers if they are in the budget, should be straight forward to reach your goal. I switched from a stock block after I saw my main caps walking.

[Steve C.]

I can't speak for 55mm but 10 years ago our custom 50mm solid roller from Bullet Racing was $700 ! And back then core availability was a big issue.



.

[chuckies76ta]

Thank you guys. Great info. So what is the benefits of the 55 mm cam and the .904 lifters? I know both are costly.

[chuckies76ta]

Originally Posted by Dragncar

You don't need the extra expense of 55mm-.904 to make 750-800HP. 55mm cams are not cheap, but you can get all the lobe swaps not available with std cams. Valve spring last much longer I understand with the big stick.
I am doing one right now (540 pump gas 11.5 CR), well have all the parts except for the cam. AND after my 461 gets done but it is about ready to get assembled.

What heads are you going with?


Thanks.

[Steve C.]

700+ horsepower from the dairy dyno. And a Secret Squirrel !

"The 505 engine was fitted with 330-cfm KRE High-Port Heads, a solid roller cam with 272/276-degree duration at 0.050 and 0.704/0.704 lift. It was installed 3 degrees advanced. The centerline and LSA specs were withheld by the builder. Valve lash was set to 0.028/0.028, timing was 32 degrees, No. 88/88 jets were used in a Holley 1050 Dominator, and 112-octane blue race fuel was run."

https://www.hotrod.com/articles/hppp...pontiac-build/


.

[chuckies76ta]

Thanks for the info Steve. Good read.

[chuckies76ta]

Originally Posted by AG

My race motor is an IAII 498 ci (4.32 x 4.25), 11.1 CR with 335 cfm Eddy heads and probably makes close to 700 HP on pump gas with the cam in my sig. Should be easy to make 750-800 with more head and bigger cam. I use a forged crank Eagle 6.800 rods, Ross pistons with a dish, 5.275" 6000 series valves, 240# seat pressure springs, Pro series rocker studs, Smith Brothers 3/8" restricted PRs, Crower HIPPO SR lifters, Crower roller rockers, stud girdle, Victor/Dominator. You might consider shaft rockers if they are in the budget, should be straight forward to reach your goal. I switched from a stock block after I saw my main caps walking.

This is really good times for your combo, and great 60 ft time also. If we could get into the low 10's that would suit me.
Car has run a best of 10.83 at 122 mph with 600 hp. Running 3.73 and the rear tires are 27.3 tall. need a true 28". Maybe the extra 100 hp would be enough. I also want the security of a stronger block. It has a 9" convertor, Moser 12 bolt with 31 spline axles, TH400.



What size rear tire you running?
What ratio rocker?
What is you rpm through the traps?
What size headers you using?



I have a set of Hippo Crower Solid roller lifters
I also have a set of 1.5 ratio Crower Stainless Rockers
I have a Forged 4.25 Crank
I have a Northwind intake.
Have a new billet timing chain.
Have a new Cam plate
I have a set of used 6.8 Eagle rods. will get new 2000 arp bolts
Need Carb.
Have windage tray.
Canton oil pan.
Have brand new MSD distributor. and msd 6al box.
Already have vacuum pump setup.
That should get a guy to 700 hp?

What else?



Thanks
Charles

[chuckies76ta]

Originally Posted by Dragncar

You don't need the extra expense of 55mm-.904 to make 750-800HP. 55mm cams are not cheap, but you can get all the lobe swaps not available with std cams. Valve spring last much longer I understand with the big stick.
I am doing one right now (540 pump gas 11.5 CR), well have all the parts except for the cam. AND after my 461 gets done but it is about ready to get assembled.

So according to this what your saying make sense.


https://www.speed-talk.com/forum/viewtopic.php?t=52004


So, if a guy stays around 700hp and let's say .750 lift, standard cam and lifters would be fine spinning to 6500?


Thanks

[AG]

Originally Posted by chuckies76ta

This is really good times for your combo, and great 60 ft time also. If we could get into the low 10's that would suit me.
Car has run a best of 10.83 at 122 mph with 600 hp. Running 3.73 and the rear tires are 27.3 tall. need a true 28". Maybe the extra 100 hp would be enough. I also want the security of a stronger block. It has a 9" convertor, Moser 12 bolt with 31 spline axles, TH400.



What size rear tire you running?
What ratio rocker?
What is you rpm through the traps?
What size headers you using?



I have a set of Hippo Crower Solid roller lifters
I also have a set of 1.5 ratio Crower Stainless Rockers
I have a Forged 4.25 Crank
I have a Northwind intake.
Have a new billet timing chain.
Have a new Cam plate
I have a set of used 6.8 Eagle rods. will get new 2000 arp bolts
Need Carb.
Have windage tray.
Canton oil pan.
Have brand new MSD distributor. and msd 6al box.
Already have vacuum pump setup.
That should get a guy to 700 hp?

What else?



Thanks
Charles

I run 1.65 rockers, 28" rear tire with 3.90 gears (I've also ran 29" tires with no difference in times), 2" primary headers, short pipe to 3" race mufflers. I shift at 6500 rpm and go through the traps at 6700 rpm. The converter flashes to 5000 rpm and the car runs between 5500-6500 rpm. The motor has a Sims cam retainer plate. 9.5" converter with about 7.8% slip at the end and an 8.5" rear with spool and 33 spline axles with Ford ends and tubes welded. With 750-800 Hp you will be in the 9s.

Here is a video from September, go to 3 min:

https://www.youtube.com/watch?v=JaHlDAiBTR8

[chuckies76ta]

Thanks for the info AG. Nice run in the video. I'm starting to think that something close to 700 hp would be lots for what were doing.

Thanks again
Charles

[AG]

You just need to decide if you want to go 10.00 or faster. I could have used a bigger cam and be in the 9s, but I have a self imposed restriction of 10.00.

[chuckies76ta]

Originally Posted by AG

You just need to decide if you want to go 10.00 or faster. I could have used a bigger cam and be in the 9s, but I have a self imposed restriction of 10.00.

If I get the car well into the 10's or 10.5 , that would be great. The 68 Firebird is actually my wife's. She's gone 10.83 at 122 mph at sea level track.



The more you read and listen to others like yourself, the more reality sets in.. Like you said, what do you want.



The car is basically street/strip, so it nice to still drive on the street. I guess 700 or even close to it should get her a 10.5


Anyhow, thanks for the help..


Charles

[Dragncar]

Originally Posted by chuckies76ta

So according to this what your saying make sense.


https://www.speed-talk.com/forum/viewtopic.php?t=52004


So, if a guy stays around 700hp and let's say .750 lift, standard cam and lifters would be fine spinning to 6500?


Thanks

Exactly, you could make more than that with a big set of heads. Over on PZ Gach has a pump gas 505 with std cam that goes 850+ on pump gas with off the shelf Comp Super Stock cam. He does currently have the best flowing set of E heads I know of (430ish) and a badd @$$ Victor. His E heads are the new E heads with LS chamber by Dave Wilcox. People LOVE them, there are a few sets out now.
The 461 I am doing right now should be right around 700 HP on pump gas. std High Ports that go 359cfm. I will run Norris SS rockers with stud girdle.
There is no reason you could not get your 700+ HP with the 350cfm std port E heads like SD sells and run your Crower SS rockers with girdle.
Now Dave Wilcox gets 372cfm out of his std E heads which will get you there with ease. You will need to have your Northwind worked by him too for that. He just did a set of big offset E heads that went 425+ and ported a Northwind to match for a guy doing a ultimate under the hood deal.
Those Eagles, I would buy some new Molnar rods. By the time you get the ARP 200 bolts and resize them you are not far off a new set of 600$ Molnars. Turns out they are a very tough rod. Better than Eagles or Scats by a long shot.
Pic is a cross section of rods. Rod on left is the Molnar vs The Eagle on the right. You tell me which is stronger. They have not had a rod caused failure yet with their standard rod let alone their Power Adder or Power Adder + rods. People use their standard rods in 1000+ HP builds.

[Dragncar]

Originally Posted by chuckies76ta

What heads are you going with?


Thanks.

I am going with a big set of 400+cfm E heads. I could sell them not sure yet. They are bad and freshly re done.

[chuckies76ta]

Thanks for the info. I don't want to get into an all out race motor. I'm wondering if a 505 cu in would put the car in the 10.5 range. at 3650 lbs 3.73's, Th400, 28" tire.. I believe Darby made 700 hp with his KRE D-port heads. I'll check out Gach at PZ..

Part of my plan is to move away from a stock block for durability issues. Don't get me wrong, the 468 were running loves to go hard.

Thanks

[Dragncar]

Originally Posted by chuckies76ta

Thanks for the info. I don't want to get into an all out race motor. I'm wondering if a 505 cu in would put the car in the 10.5 range. at 3650 lbs 3.73's, Th400, 28" tire.. I believe Darby made 700 hp with his KRE D-port heads. I'll check out Gach at PZ..

Part of my plan is to move away from a stock block for durability issues. Don't get me wrong, the 468 were running loves to go hard.

Thanks

You will have to try to NOT make it run 9s. 10 5.s ? I am not far off that (10.83) with a TRW 455 and HO heads with 9.3 CR. The 461 will get me close to 10 flat but I do not plan on spinning it real hard . The 540 will not be a high RPM "cubic dollar" engine either.

[slowbird]

Gach doesn't have a 850hp pump gas engine, everything he says/posts is mostly bs. Dragncar should know better than to bring him up.

[grandville455]

Originally Posted by chuckies76ta

. I believe Darby made 700 hp with his KRE D-port heads. I'll check out Gach at PZ..

Part of my plan is to move away from a stock block for durability issues. Don't get me wrong, the 468 were running loves to go hard.

Thanks

I made 748@6400 on straight 91 octane with small KRE D Ports n the cars been 9.61@138 with 3.73 gears at 3580 lbs, it’s 25 lbs heavier now with the new front end. Get the right stuff n you’ll run 9’s