Will this make 500 hp ?

[Ed Wright]

I don't know, Team Creason did 570 ish hp on 1.625 primary x 2.5 inch collector box headers.

Would have made more with larger headers. My early 350" only made ~570, it preferred 1 7/8" primaries.

[CGT]

I don't know, Team Creason did 570 ish hp on 1.625 primary x 2.5 inch collector box headers.

Would have made more with larger headers. My early 350" only made ~570, it preferred 1 7/8" primaries.

lol. More where?

[cv67]

but i honestly think he is gonna be happy with the engine as it is. It destroys the BFG 295/50's. As i mentioned before, it will likely never go down the track. The customer is a farmer who pulled this car out of the shed after sitting for many years. Painted it and wants to have fun.

And that's all that matters.
The only time I see a customer upset about the cam I sold him, is when it makes the HP number that he demanded it had to make, but now it won't cruise down the road in overdrive smoothly at 1,400rpm.

sounds like a vette guy haha

[Ed Wright]

I don't know, Team Creason did 570 ish hp on 1.625 primary x 2.5 inch collector box headers.

Would have made more with larger headers. My early 350" only made ~570, it preferred 1 7/8" primaries.

lol. More where?

LOL, 5K & up. No loses as low as the dyno could go.
It is an NHRA Super Stock LT1. Factory castings, Stock port volumes, valve sizes, compression ratio, stock throttle body. Any valvetrain allowed.
I also have a set of 1 3/4" to 1 7/8" step headers. Back/to-back, same day, at the race track, my just purchased 1 7/8" Stahl's were 5 to 6 hundredths quicker, and a full MPH faster. Track rentals are often very educational.

[CGT]

LOL, 5K & up. No loses as low as the dyno could go.
It is an NHRA Super Stock LT1. Factory castings, Stock port volumes, valve sizes, compression ratio, stock throttle body. Any valvetrain allowed.
I also have a set of 1 3/4" to 1 7/8" step headers. Back/to-back, same day, at the race track, my just purchased 1 7/8" Stahl's were 5 to 6 hundredths quicker, and a full MPH faster. Track rentals are often very educational.

EMC is over at 6500 and that was not the only set of headers tested on that engine. If it was a drag car it could be faster with a different set of headers, but that set of headers would have hurt score considerably.

[Ed Wright]

I wondered who "team Creason" would be. Could not think of any racers calling themselves that.

[Rick360]

I'm just finishing a 406 SBC for a customers street 74 Camaro. It has 3.73 gears and a turbo 400 with a 3500 convertor. I told him i would build 500 hp. Here is the combo :

Scat 9000 series rotating assembly with Icon forged pistons and 6" rods, internal balanced. 10. 2 compression. Piston is .005 in the hole.
Comp hyd roller 242 / 248 @ .050 .540/.562 lift 110 LSA 12-443-8 part number
Edelbrock E-210 heads, out of the box
Edelbrock performer RPM air gap intake out of the box stock.
Holley 750 vacuum #3310.
ancient unknown 1 5/8 headers.

It won't make it on to a dyno. Just thought I'd see what the pro's suggest for horsepower estimates.
Brian

Should be able to make 500hp.

EMC is over at 6500 and that was not the only set of headers tested on that engine. If it was a drag car it could be faster with a different set of headers, but that set of headers would have hurt score considerably.

Actually last years EMC was 3500-6800 for small blocks.

]LOL, 5K & up. No loses as low as the dyno could go.
It is an NHRA Super Stock LT1. Factory castings, Stock port volumes, valve sizes, compression ratio, stock throttle body. Any valvetrain allowed.
I also have a set of 1 3/4" to 1 7/8" step headers. Back/to-back, same day, at the race track, my just purchased 1 7/8" Stahl's were 5 to 6 hundredths quicker, and a full MPH faster. Track rentals are often very educational.

Do you really think the OP engine would run best with 1-7/8" headers? 3.73 gear and 3500 stall with 3310 carb and ootb 210 heads with .540 lift? 1-7/8" headers would hurt the low rpm power and the rest of the combo can't make any high rpm hp. Good 1-5/8" headers will be fine for that level engine. IMO.

SS heads are made to turn the rpm with the shape of the ports and the LS has a big port to start with.

My 434 made more power (870) with 1-7/8" headers compared to 2-1/8". Not a perfectly fair test comparing dragster to chassis headers but was only even at upper rpm and no better at any rpm.

Rick

[Ed Wright]

Only 410" engine I ever raced loved 2" headers. I had a street 383" LT1 that made the most power with 2" headers, but there is not enough room in my engine compt for them built correctly. My 350" LT1 Super Stock engines makes the most power on the dyno with 2". I used to talk to Jere Stahl a lot. Met him when he & Bill Stiles used a friend's shop when the NHRA WOrld Finals was here in Tulsa. He had his Street Hemi MOPAR at that time. I used his headers since 1966. He looked at my engine specs, dyno data, ran it through his modeling software, and told me my 350" was making enough power it should like at least 1 7/8" to 2" step headers. I know my 350" loved his 1 7/8", more at the track than on the dyno. I know we don't race dynos.
We lost him before I got my money gathered up to order them. They were going to be pricey.

[econo racer]

Frankshaft you said you ran high tens on a set of 993 heads? Thats very impressive because I have run those heads for yrs and was never near that fast.

[Ed Wright]

I'm just finishing a 406 SBC for a customers street 74 Camaro. It has 3.73 gears and a turbo 400 with a 3500 convertor. I told him i would build 500 hp. Here is the combo :

Scat 9000 series rotating assembly with Icon forged pistons and 6" rods, internal balanced. 10. 2 compression. Piston is .005 in the hole.
Comp hyd roller 242 / 248 @ .050 .540/.562 lift 110 LSA 12-443-8 part number
Edelbrock E-210 heads, out of the box
Edelbrock performer RPM air gap intake out of the box stock.
Holley 750 vacuum #3310.
ancient unknown 1 5/8 headers.

It won't make it on to a dyno. Just thought I'd see what the pro's suggest for horsepower estimates.
Brian

Should be able to make 500hp.

EMC is over at 6500 and that was not the only set of headers tested on that engine. If it was a drag car it could be faster with a different set of headers, but that set of headers would have hurt score considerably.

Actually last years EMC was 3500-6800 for small blocks.

]LOL, 5K & up. No loses as low as the dyno could go.
It is an NHRA Super Stock LT1. Factory castings, Stock port volumes, valve sizes, compression ratio, stock throttle body. Any valvetrain allowed.
I also have a set of 1 3/4" to 1 7/8" step headers. Back/to-back, same day, at the race track, my just purchased 1 7/8" Stahl's were 5 to 6 hundredths quicker, and a full MPH faster. Track rentals are often very educational.

Do you really think the OP engine would run best with 1-7/8" headers? 3.73 gear and 3500 stall with 3310 carb and ootb 210 heads with .540 lift? 1-7/8" headers would hurt the low rpm power and the rest of the combo can't make any high rpm hp. Good 1-5/8" headers will be fine for that level engine. IMO.

SS heads are made to turn the rpm with the shape of the ports and the LS has a big port to start with.

My 434 made more power (870) with 1-7/8" headers compared to 2-1/8". Not a perfectly fair test comparing dragster to chassis headers but was only even at upper rpm and no better at any rpm.

Rick

I'm amazed that at 870 hp it would prefer small headers. My 383" street engine was 645, and loved 2". Never bothered to test 2 1/8", as I knew there was no way they would fit between the sub frame rails. It would be tough to get 2" primaries in there with a decent angle off the flanges. The 1 7/8" primaries just barely clear.
The engine compartment is pretty tight in a '96 Firebird/Trans Am.
I guess different dynos, etc. Lowest they were able to get the dyno to load was 5800. My 350"S converter flashes to 6400. I was wanting to get a look at my air/fuel at that RPM. Ended up having to use my 60' times for a reference. Just tested to find what got me the best 60' times.
I'm surprised Engine Masters can test them at 3500.